Small Hydro Resource Mapping in Tanzania LIST OF MOST PROMISING SITES January 2017 This report was prepared by SHER in association with Mhylab, under contract to The World Bank. It is one of several outputs from the small hydro Energy Resource Mapping and Geospatial Planning Tanzania [Project ID: P145287]. This activity is funded and supported by the Energy Sector Management Assistance Program (ESMAP), a multi-donor trust fund administered by The World Bank, under a global initiative on Renewable Energy Resource Mapping. Further details on the initiative can be obtained from the ESMAP website. This report is an interim output from the above-mentioned project. Users are strongly advised to exercise caution when utilizing the information and data contained, as this has not been subject to validation using ground measurement data or peer review. The final output from this project will be a validated Tanzania Small Hydro Atlas, which will be published once the project is completed. Copyright © 2017 THE WORLD BANK Washington DC 20433 Telephone: +1-202-473-1000 Internet: www.worldbank.org The World Bank, comprising the International Bank for Reconstruction and Development (IBRD) and the International Development Association (IDA), is the commissioning agent and copyright holder for this publication. However, this work is a product of the consultants listed, and not of World Bank staff. The findings, interpretations, and conclusions expressed in this work do not necessarily reflect the views of The World Bank, its Board of Executive Directors, or the governments they represent. The World Bank does not guarantee the accuracy of the data included in this work and accept no responsibility for any consequence of their use. The boundaries, colors, denominations, and other information shown on any map in this work do not imply any judgment on the part of The World Bank concerning the legal status of any territory or the endorsement or acceptance of such boundaries. The material in this work is subject to copyright. Because The World Bank encourages dissemination of its knowledge, this work may be reproduced, in whole or in part, for non-commercial purposes as long as full attribution to this work is given. Any queries on rights and licenses, including subsidiary rights, should be addressed to World Bank Publications, The World Bank Group, 1818 H Street NW, Washington, DC 20433, USA; fax: +1-202-522-2625; e-mail: pubrights@worldbank.org. Furthermore, the ESMAP Program Manager would appreciate receiving a copy of the publication that uses this publication for its source sent in care of the address above, or to esmap@worldbank.org. Small Hydro Tanzania REA / The World Bank Contract n°7169139 SHER Ingénieurs-conseils s.a. Rue J. Matagne, 15 5020 Namur – Belgium Phone : +32 81 32 79 80 Fax : +32 81 32 79 89 www.sher.be Project Manager: Rebecca DOTET Référence SHER : TNZ01 Phone : +32 (0) 81 327 982 Fax : +32 (0) 81 327 989 E-mail : dotet@sher.be Rev.n° Date Content Drafted Verified 0 02/2015 Site Visit report - Interim Pierre SMITS Pierre SMITS Thomas DUBOIS Giress MUNYANDEKWE Alice VANDENBUSSCHE 1 04/2015 Site Visit report - FINAL Pierre SMITS Pierre SMITS Thomas DUBOIS Giress MUNYANDEKWE Alice VANDENBUSSCHE 2 12/2016 Site Visit report - Interim Pierre SMITS Pierre SMITS Included 7 additional sites Damien DUBOIS Thomas DUBOIS SHER INGÉNIEURS-CONSEILS S.A. IS ISO 9001 CERTIFIED SHER s.a. in association with Mhylab Site visit report - December 2016 Page 5 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 SHER s.a. in association with Mhylab Site visit report - December 2016 Page 6 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 I. GENERAL CONTEXT OF THE ESMAP – FWC PROJECT The Energy Sector Management Assistance Program (ESMAP), a global knowledge and technical assistance program administered by the World Bank and supported by 11 bilateral donors, has launched, in January 2013, an initiative that will support country-driven efforts to improve RE resource awareness, put in place appropriate policy frameworks for RE development, and provide ‘open access’ to resource and geospatial mapping data. It will also support the IRENA Solar and Wind Atlas by improving the data availability and quality that can be accessed through the atlas on a modular basis. This "Renewable Energy Mapping: Small Hydro Tanzania" study, is part of a technical assistance project, ESMAP funded, being implemented by Africa Energy Practice 1 (AFTG1) of the World Bank in Tanzania (the ‘Client’) which aims at supporting resource mapping and geospatial planning for small hydro. It is being undertaken in close coordination with the Rural Energy Agency (REA) of Tanzania, the World Bank’s primary Client country counterpart for this study. The "Provision of Small Hydropower Resource Data and Mapping Services" IDA 8004801 Framework contract was signed 29th May 2013, while the specific contract " Renewable Energy Mapping: Small Hydro Tanzania", n. 7169139, is dated 4th November 2013. II. FRAMEWORK OF THE SITE VISITS REPORT IN TANZANIA The Site visits Report is the result of the consolidation of the primary and secondary data collected and processed during the site visits. This report comes with the Hydro Mapping report provided at the end of Phase 1 which established an inventory of existing and potential hydropower sites put into perspective in their socio-economic and natural environment. The fact sheets, presented in this report, for the 78 hydropower potential visited sites, contain some preliminary information that must be verified during further detailed investigations before any project development. Amongst these potential sites, 75 sites with an interest have been considered in the Small Hydro Mapping report. In addition, it has been agreed upon with the Client (during the Workshop held in Dar-es-Salaam in March 2015) that the Consultant will undertake during Phase 2 the review of the 36 potential sites to select a subset of 7 sites matching the selection criteria for promising small hydropower sites as defined by this study (out of protected area, no detailed studies available, in the power range of this study, etc...).The Consultant has conducted site visits of those 7 selected sites to further evaluate their interest for private investment at short-term. The results of the site visits are presented in the section IV of this report. In total, the report presents the fact sheets of 85 visited sites. SHER s.a. in association with Mhylab Site visit report - December 2016 Page 7 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 SHER s.a. in association with Mhylab Site visit report - December 2016 Page 8 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 Table of Contents I. General context of the ESMAP – FWC project ............................................................................................................. 7 II. Framework of the Site Visits report in TANZANIA ....................................................................................................... 7 III. 78 Promising potential small hydropower sites ........................................................................................................ 12 1 Achesherero (M-118).................................................................................................................................................... 12 2 Bubu I (SF-092) ............................................................................................................................................................. 15 3 Bubu II (SF-091) ............................................................................................................................................................ 18 4 Chulu (SF-206) .............................................................................................................................................................. 21 5 Kalambo Falls (SF-018) ................................................................................................................................................. 24 6 Kalambo I (SF-214A) ..................................................................................................................................................... 27 7 Kalambo II (SF-214B) .................................................................................................................................................... 30 8 Kawa (N-002) ............................................................................................................................................................... 33 9 Kelolilo (M-288) ............................................................................................................................................................ 36 10 Kianda (SF-219) ............................................................................................................................................................ 39 11 Kigogo (SF-294) ............................................................................................................................................................ 42 12 Kilida (SF-207) .............................................................................................................................................................. 45 13 Kingilikiti (N-011) .......................................................................................................................................................... 48 14 Kishanda (SF-164) ......................................................................................................................................................... 51 15 Kitandazi II (N-010)....................................................................................................................................................... 54 16 Kitewaka (M-110) ......................................................................................................................................................... 57 17 Kitogota Falls (M-121B)................................................................................................................................................ 60 18 Kitogota I (M-121A) ...................................................................................................................................................... 63 19 Kivumilo (SF-041).......................................................................................................................................................... 66 20 Komungu (SF-144) ........................................................................................................................................................ 69 21 Kyamato (M-113) ......................................................................................................................................................... 72 22 Lipumba (M-297) .......................................................................................................................................................... 75 23 Litembo Extension (M-298B) ........................................................................................................................................ 78 24 Luaita (M-299).............................................................................................................................................................. 81 25 Lubare (M-119)............................................................................................................................................................. 84 26 Luegere (SF-022)........................................................................................................................................................... 87 27 Luika (M-277) ............................................................................................................................................................... 90 28 Lukarasi shp (M-301) .................................................................................................................................................... 93 29 Lukosi (SF-082) ............................................................................................................................................................. 96 30 Lupa (SF-189)................................................................................................................................................................ 99 31 Lupapilo (SF-029) ........................................................................................................................................................ 102 32 Luwika I (M-268A) ...................................................................................................................................................... 105 SHER s.a. in association with Mhylab Site visit report - December 2016 Page 9 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 33 Luwika II (M-268B) ..................................................................................................................................................... 108 34 Luwila (SF-068) ........................................................................................................................................................... 111 35 Lwazi (SF-019) ............................................................................................................................................................ 114 36 Lwiche (SF-211) .......................................................................................................................................................... 117 37 Lyandembela I (SF-109) .............................................................................................................................................. 120 38 Lyandembela II (SF-289) ............................................................................................................................................. 123 39 Mambi (M-221) .......................................................................................................................................................... 126 40 Manique (SF-056) ....................................................................................................................................................... 129 41 Maparengi (SF-069).................................................................................................................................................... 132 42 Mara I (SF-052A) ........................................................................................................................................................ 135 43 Mara II (SF-052B) ....................................................................................................................................................... 138 44 Mbagala (SF-277) ....................................................................................................................................................... 141 45 Mbawa (SF-UN) .......................................................................................................................................................... 144 46 Mchakama (SF-123) ................................................................................................................................................... 147 47 Mfizi I (SF-208) ........................................................................................................................................................... 151 48 Mfizi II (SF-020) .......................................................................................................................................................... 154 49 Mfizi III (SF-278) ......................................................................................................................................................... 157 50 Mgaka I (M-355A) ...................................................................................................................................................... 160 51 Mgaka II (M-355B) ..................................................................................................................................................... 163 52 Mgambazi (SF-178) .................................................................................................................................................... 166 53 Mihima (SF-271) ......................................................................................................................................................... 169 54 Mkalamo (SF-145) ...................................................................................................................................................... 172 55 Mlowa (SF-083) .......................................................................................................................................................... 175 56 Momba I (SF-017) ....................................................................................................................................................... 178 57 Momba II (M-070) ...................................................................................................................................................... 181 58 Mponde I (SF-305) ...................................................................................................................................................... 184 59 Mponde II (SF-067) ..................................................................................................................................................... 187 60 Muhama (SF-185) ....................................................................................................................................................... 190 61 Muhuwezi (SF-266) ..................................................................................................................................................... 193 62 Muyovozi (SF-187) ...................................................................................................................................................... 196 63 Muze (SF-212) ............................................................................................................................................................ 199 64 Myombezi (M-295) ..................................................................................................................................................... 202 65 Ndembela I (SF-107) ................................................................................................................................................... 205 66 Ndembela II (SF-108) .................................................................................................................................................. 208 67 Ndurumo (SF-153) ...................................................................................................................................................... 211 68 Ngongi I (M-267A) ...................................................................................................................................................... 214 69 Ngongi II (M-267B) ..................................................................................................................................................... 217 SHER s.a. in association with Mhylab Site visit report - December 2016 Page 10 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 70 Nyembe (SF-213) ........................................................................................................................................................ 220 71 Ruchugi (SF-172) ........................................................................................................................................................ 223 72 Ruhuhu (M-127) ......................................................................................................................................................... 226 73 Samba (SF-343) .......................................................................................................................................................... 229 74 Samvya (SF-217) ......................................................................................................................................................... 232 75 Sasimo I (SF-080A) ...................................................................................................................................................... 235 76 Sasimo II (SF-080B) ..................................................................................................................................................... 238 77 Vambanungwi (SF-296) .............................................................................................................................................. 241 78 Wami (SF-143) ............................................................................................................................................................ 244 IV. 7 Additional promising potential small hydropower sites .................................................................................. 247 79 Mandera’s Waterfalls (M-245)................................................................................................................................... 247 80 Umba (M-239) ............................................................................................................................................................ 250 81 Mkombola (M-222) .................................................................................................................................................... 253 82 Mlowa (M-232) .......................................................................................................................................................... 256 83 Mulawi (M-230) ......................................................................................................................................................... 259 84 Mgugwe (M-228) ....................................................................................................................................................... 262 85 Mfisigo (M-211).......................................................................................................................................................... 265 SHER s.a. in association with Mhylab Site visit report - December 2016 Page 11 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Achesherero (M-118) - III. 78 PROMISING POTENTIAL SMALL HYDROPOWER SITES 1 ACHESHERERO (M-118) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.159 - 1.663 Powerhouse 31.171 - 1.661 1. Administrative and socio-economic data Site code M-118 Site name Achesherero River Achesherero Village - Region Kagera Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 8/1 (scale 1/50,000) 2. Reference study Study name : Reconnaissance Study Mini Hydropower Potential in Kagera Region Draft Report Author : Tanesco Edition year : 2006 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 0.14 0.30 Gross head [m] 18 90 Installed capacity [kW] 38 200 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 12 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Achesherero (M-118) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme, located in the vicinity of a large waterfall, designed with a small masonry weir on a wide site. Canal, penstock and powerhouse are located on the left riverbank. Canal length [m] 2,197 Tunnel length [m] 0 Penstock length [m] 1 x 273 Dam type Masonery dam Dam height [m] 2 Dam width [m] 30 Measured turbidity [NTU] 60 Comments on solid transport None Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.44 (1 penstock(s)) Transmission line length [km] 9.0 Total road length to create [km] 1.0 Total road length to upgrade [km] 3.0 Potential impact of the scheme None Comments on accessibility - Other comments Connection to Bukoba minigrid Canal on the left side of the river. No future infractructure is foreseen in the coming years. A daily reservoir option with a 50 to 60m high dam should be studied at further stages but it must include ESIA and RAP studies. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 90 Firm discharge [m³/s] 0.04 Firm capacity [kW] 27 Firm energy [GWh/yr] 0.24 Operating discharge [m³/s] 0.06 0.30 Installed capacity [kW] 50 200 Annual production [GWh/yr] 0.40 1.34 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 13 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Achesherero (M-118) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.04 Q90% discharge [m³/s] 0.06 Q50% discharge [m³/s] 0.27 Q30% discharge [m³/s] 0.42 Design flood P100 yr [m³/s] 2.21 Catchment area [km²] 55 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Overall view of the site Figure 3 : The large waterfall is hidden by these herbs Figure 4 : Dam site Figure 5 : River view close to powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 14 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Bubu I (SF-092) - 2 BUBU I (SF-092) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.497 - 5.372 Powerhouse 35.497 - 5.372 1. Administrative and socio-economic data Site code SF-092 Site name Bubu I River BUBU Village KWA MTORO Region Dodoma Basin Northern Lakes Topographical map reference Topographical map n° 123/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 93.50 Gross head [m] - 35 Installed capacity [kW] - 21,970 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 15 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Bubu I (SF-092) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Connected to the main grid Scheme description : The river is dry during the dry season and flooding problem occur during the rainy season (November to May). To mitigate this, the scheme is designed with a seasonly operated reservoir that will release water during the dry season. This reservoir will also provide regulation for the downstream Bubu II site (SF-091). The scheme is designed with the powerhouse at the foot of the dam. Sediment issue is complex for this site and must be analized in details in the next study stages and this scheme sould be analysed as a multi-purpose reservoir (irrigation, reservoir for livestock, hydropower). Given the topography, it is probable that the reservoir will not have enough capacity to provide storage for the whole dry season. Hence, it is probable that this scheme will only be operated part of the year. Moreover, the size of this scheme falls out of the scope of private investors. It should be studied at a national level and included in a master plan if cost effective. Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 10 x 40 Dam type Concrete dam Dam height [m] 40 Dam width [m] 1,200 Measured turbidity [NTU] 400 Comments on solid transport Sand deposit Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.85 (10 penstock(s)) Transmission line length [km] 70.0 Total road length to create [km] 1.1 Total road length to upgrade [km] 5.0 Potential impact of the scheme None Comments on accessibility - Other comments To supply the National Grid. No canal nor tunnel is planned as the powerhouse is placed at the foot of the dam No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 35 Firm discharge [m³/s] 1.73 Firm capacity [kW] 214 Firm energy [GWh/yr] 3.56 Operating discharge [m³/s] 14.20 93.50 Installed capacity [kW] 3,340 21,970 Annual production [GWh/yr] 7.03 35.01 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 16 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Bubu I (SF-092) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.73 Q90% discharge [m³/s] 3.55 Q50% discharge [m³/s] 23.38 Q30% discharge [m³/s] 40.60 Design flood P100 yr [m³/s] 354.28 Catchment area [km²] 7,566 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Global view of the site Figure 3 : Detailed view of the river upstream of the site Figure 4 : Bridge on the site and surroundings Figure 5 : Detailed view of the bridge and gauging station SHER s.a. in association with Mhylab Site visit report – December 2016 Page 17 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Bubu II (SF-091) - 3 BUBU II (SF-091) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.490 - 5.387 Powerhouse 35.468 - 5.406 1. Administrative and socio-economic data Site code SF-091 Site name Bubu II River BUBU Village KWA MTORO Region Dodoma Basin Northern Lakes Topographical map reference Topographical map n° 123/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 23.50 Gross head [m] - 90 Installed capacity [kW] - 17,430 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 18 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Bubu II (SF-091) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : This scheme is designed as a run-of-the-river scheme with canal, forebay, penstock and powerhouse on the left riverbank. A small weir will divert water into the canal. The scheme could benefit from regulation and storage provided by the upstream Bubu I scheme (SF-092). This scheme sould be analysed as a multi-purpose reservoir (irrigation, reservoir for livestock, hydropower) Canal length [m] 3,884 Tunnel length [m] 0 Penstock length [m] 3 x 566 Dam type Masonery dam Dam height [m] 3 Dam width [m] 100 Measured turbidity [NTU] 400 Comments on solid transport Sand deposit Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.06 (3 penstock(s)) Transmission line length [km] 65.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 2.0 Potential impact of the scheme None Comments on accessibility - Other comments To supply the National Grid. Canal at left side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 90 Firm discharge [m³/s] 1.74 Firm capacity [kW] 1,290 Firm energy [GWh/yr] 11.30 Operating discharge [m³/s] 3.60 23.50 Installed capacity [kW] 2,640 17,430 Annual production [GWh/yr] 22.27 135.47 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 19 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Bubu II (SF-091) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.74 Q90% discharge [m³/s] 3.57 Q50% discharge [m³/s] 23.46 Q30% discharge [m³/s] 40.75 Design flood P100 yr [m³/s] 355.57 Catchment area [km²] 7,601 Hydrological confidence interval Low 6. Representative pictures Figure 2 : View towards the site Figure 3 : Detailed view of the river upstream of the site Figure 4 : Bridge on a tributary of the river Figure 5 : Bridge on the main river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 20 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Chulu (SF-206) - 4 CHULU (SF-206) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.449 - 7.596 Powerhouse 31.478 - 7.588 1. Administrative and socio-economic data Site code SF-206 Site name Chulu River Chulu Village Several villages along the shores of Lake Rukwa Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 206/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.30 Gross head [m] - 800 Installed capacity [kW] - 2,240 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 21 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Chulu (SF-206) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The Chulu river falls on the escarpment of a height over 800m. Altough agriculture is intense on the watershed, the water quality seems still acceptable for a high weir or a dam, giving more options for the intake position. Penstock liying might be challenging given the head and the challenging terrain. Canal length [m] 0 Tunnel length [m] 1,150 Penstock length [m] 1 x2,942 Dam type Masonery dam Dam height [m] 10 Dam width [m] 50 Measured turbidity [NTU] 40 Comments on solid transport At the time of visit, solid transport was very limited. However, the soils on the watershed are exposed due to agriculture. Desilting basin size A medium sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 0.44 (1 penstock(s)) Transmission line length [km] 40.0 Total road length to create [km] 19.0 Total road length to upgrade [km] 1.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: 2km from a dirt road. Existing dirt road on 17km (from Milundikwa) Powerhouse access: Good: near the road Other comments Connection to Sumbawanga minigrid. A 1.150m long tunnel will allow to cross the hill on the right riverbank. No future infractructure is foreseen in the coming years. The intake is not located at the dam position in order to reduce the tunnel length. Future studies should also consider a "canal option" and a "high weir" or "reservoir" option in order to locate the intake at a position which will allow to reduce the tunnel length. Site to be compared with Kilida, Lwiche, Muze and Nyembe sites in a prefeasibility study in order to define which one should be further developped to connect to Sumbawanga minigrid. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 800 Firm discharge [m³/s] 0.01 Firm capacity [kW] 84 Firm energy [GWh/yr] 0.73 Operating discharge [m³/s] 0.03 0.30 Installed capacity [kW] 210 2,240 Annual production [GWh/yr] 1.72 13.81 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 22 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Chulu (SF-206) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.01 Q90% discharge [m³/s] 0.03 Q50% discharge [m³/s] 0.35 Q30% discharge [m³/s] 0.70 Design flood P100 yr [m³/s] 10.44 Catchment area [km²] 91 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Possible weir position Figure 3 : Upstream of weir, where the valley is parallel to the escarpment Figure 4 : Detail of the river near the weir position Figure 5 : Terrain around the waterfall SHER s.a. in association with Mhylab Site visit report – December 2016 Page 23 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo Falls (SF-018) - 5 KALAMBO FALLS (SF-018) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.240 - 8.596 Powerhouse 31.234 - 8.594 1. Administrative and socio-economic data Site code SF-018 Site name Kalambo Falls River Kalambo Village Kapozwa Region Rukwa Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 241 W/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 6.30 Gross head [m] - 200 Installed capacity [kW] - 10,360 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 24 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo Falls (SF-018) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Beautiful single drop waterfall. Hard rock requiring a tunnel. New road to be built for the powerhouse access. Site at the border with Zambia. Canal length [m] 0 Tunnel length [m] 410 Penstock length [m] 1 x 396 Dam type Masonery dam Dam height [m] 5 Dam width [m] 35 Measured turbidity [NTU] 30 Comments on solid transport Limited quantities of sand on the river shores. Desilting basin size A medium sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.52 (1 penstock(s)) Transmission line length [km] 31.0 Total road length to create [km] 20.0 Total road length to upgrade [km] 18.0 Potential impact of the scheme Touristic spot on both side of the border. Transbordary water basin management to be further analyzed. Comments on accessibility Weir access: Average: long unpaved road Powerhouse access: Difficult: probably around 18km of new road to be laid Other comments Connection to the Sumbawanga mini-grid. No canal possible. Tunnel for 410m on the right river bank. No future infractructure is foreseen in the coming years. Future studies could analyze a reservoir option, but storage capacity is limited by the topography. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 200 Firm discharge [m³/s] 0.19 Firm capacity [kW] 315 Firm energy [GWh/yr] 2.76 Operating discharge [m³/s] 0.50 6.30 Installed capacity [kW] 820 10,360 Annual production [GWh/yr] 6.85 63.06 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 25 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo Falls (SF-018) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.19 Q90% discharge [m³/s] 0.50 Q50% discharge [m³/s] 6.27 Q30% discharge [m³/s] 13.16 Design flood P100 yr [m³/s] 240.67 Catchment area [km²] 3,193 Hydrological confidence interval High 6. Representative pictures Figure 2 : Picture taken just above the waterfall Figure 3 : Part of the waterfall Figure 4 : Gorge downstream Figure 5 : Some geological features SHER s.a. in association with Mhylab Site visit report – December 2016 Page 26 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo I (SF-214A) - 6 KALAMBO I (SF-214A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.430 - 8.291 Powerhouse 31.427 - 8.294 1. Administrative and socio-economic data Site code SF-214A Site name Kalambo I River Kalambo Village Mbuza, Mkowe Region Rukwa Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 224/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 5.10 Gross head [m] - 20 Installed capacity [kW] - 840 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 27 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo I (SF-214A) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Two small waterfalls of 20m high each are following each other are developped in two hydropower schemes, namely Kalambo I and Kalombo II. Kalambo I is the most upstream scheme, where gentle slopes are found on the surrounding, allowing canal building. Hard soils might be found. Canal length [m] 585 Tunnel length [m] 0 Penstock length [m] 1 x 131 Dam type Masonery dam Dam height [m] 5 Dam width [m] 25 Measured turbidity [NTU] 30 Comments on solid transport No sign of sand Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.89 (1 penstock(s)) Transmission line length [km] 16.0 Total road length to create [km] 2.0 Total road length to upgrade [km] 5.0 Potential impact of the scheme Lots of fish in the river, many fishermen. Fishladder to be installed. Comments on accessibility Weir access: Good: 1.7km from the road Powerhouse access: Good: 4.3km from the road Other comments Connection to Sumbawanga minigrid. Canal on mixed grounds, right embankment. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 20 Firm discharge [m³/s] 0.16 Firm capacity [kW] 26 Firm energy [GWh/yr] 0.23 Operating discharge [m³/s] 0.40 5.10 Installed capacity [kW] 70 840 Annual production [GWh/yr] 0.57 5.14 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.16 Q90% discharge [m³/s] 0.41 Q50% discharge [m³/s] 5.10 Q30% discharge [m³/s] 10.64 Design flood P100 yr [m³/s] 191.19 Catchment area [km²] 1,305 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 28 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo I (SF-214A) - 6. Representative pictures Figure 2 : First weir location Figure 3 : View on the first waterfall Figure 4 : Upstream of second waterfall Figure 5 : Detail of the river near the second waterfall at the proposed powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 29 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo II (SF-214B) - 7 KALAMBO II (SF-214B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.423 - 8.298 Powerhouse 31.419 - 8.301 1. Administrative and socio-economic data Site code SF-214B Site name Kalambo II River Kalambo Village Mbuza, Mkowe Region Rukwa Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 224/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 5.20 Gross head [m] - 20 Installed capacity [kW] - 850 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 30 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo II (SF-214B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Scheme develpped around the second waterfall and following Kalambo I. Gentle slopes allowing canal building are also found int the surroundings of Kalambo II. Hard soils might be found. Canal length [m] 758 Tunnel length [m] 0 Penstock length [m] 1 x 271 Dam type Masonery dam Dam height [m] 5 Dam width [m] 20 Measured turbidity [NTU] 30 Comments on solid transport No sign of sand Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.10 (1 penstock(s)) Transmission line length [km] 18.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 1.0 Potential impact of the scheme Lots of fish in the river, many fishermen. Fishladder to be installed. Comments on accessibility Site near the main road, a few paths lead to the site Other comments Connection to Sumbawanga minigrid. Canal on mixed grounds, right embankment. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 20 Firm discharge [m³/s] 0.16 Firm capacity [kW] 26 Firm energy [GWh/yr] 0.23 Operating discharge [m³/s] 0.40 5.20 Installed capacity [kW] 70 850 Annual production [GWh/yr] 0.57 5.19 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.16 Q90% discharge [m³/s] 0.42 Q50% discharge [m³/s] 5.15 Q30% discharge [m³/s] 10.75 Design flood P100 yr [m³/s] 193.15 Catchment area [km²] 1,318 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 31 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kalambo II (SF-214B) - 6. Representative pictures Figure 2 : Picture of waterfall taken from upstream Figure 3 : Overview of waterfall Figure 4 : Detail of river near the proposed powerhouse site Figure 5 : Detail of the river near the second waterfall at the proposed powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 32 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kawa (N-002) - 8 KAWA (N-002) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.211 - 8.489 Powerhouse 31.169 - 8.484 1. Administrative and socio-economic data Site code N-002 Site name Kawa River Kawa Village Kasanga Region Rukwa Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 224/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.06 Gross head [m] - 260 Installed capacity [kW] - 130 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 33 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kawa (N-002) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : The Kawa river drops on a high slope allowing an altitude loss of 260m. The canal will be long and mostly on hard soils. The site is not favorable for a reservoir scheme, hence it is designed as a run of the river scheme. Canal length [m] 7,931 Tunnel length [m] 0 Penstock length [m] 1 x 826 Dam type Masonery dam Dam height [m] 5 Dam width [m] 20 Measured turbidity [NTU] 30 Comments on solid transport Limited solid transport visible Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.22 (1 penstock(s)) Transmission line length [km] 3.5 Total road length to create [km] 1.0 Total road length to upgrade [km] 3.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Good: near the road Powerhouse access: Average: 3km from the road Other comments Isolated grid to feed closeby load centers Long (around 8km) on hard soils. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 260 Firm discharge [m³/s] 0.02 Firm capacity [kW] 48 Firm energy [GWh/yr] 0.42 Operating discharge [m³/s] 0.06 0.70 Installed capacity [kW] 130 1,560 Annual production [GWh/yr] 1.05 11.76 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.02 Q90% discharge [m³/s] 0.06 Q50% discharge [m³/s] 0.73 Q30% discharge [m³/s] 1.53 Design flood P100 yr [m³/s] 27.55 Catchment area [km²] 170 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 34 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kawa (N-002) - 6. Representative pictures Figure 2 : Near intake position Figure 3 : Upstream of weir Figure 4 : Downstream of Powerhouse, in rice and palm Figure 5 : Near possible powerhouse location plantation SHER s.a. in association with Mhylab Site visit report – December 2016 Page 35 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kelolilo (M-288) - 9 KELOLILO (M-288) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.708 -10.102 Powerhouse 34.726 -10.102 1. Administrative and socio-economic data Site code M-288 Site name Kelolilo River Kelolilo Village Ludewa Region Njombe Basin Lake Nyasa Topographical map reference Topographical map n° 285/1 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] Unknown 0.70 Gross head [m] Unknown 69 Installed capacity [kW] 5,100 400 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 36 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kelolilo (M-288) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Right bank canal following the river towards forebay and penstock descending to the powerhouse. Canal length [m] 2,365 Tunnel length [m] 0 Penstock length [m] 1 x 287 Dam type Masonery dam Dam height [m] 7 Dam width [m] 25 Measured turbidity [NTU] 150 Comments on solid transport Sand and small stones (< 5cm). Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.70 (1 penstock(s)) Transmission line length [km] 3.0 Total road length to create [km] 1.8 Total road length to upgrade [km] 3.0 Potential impact of the scheme Upstream: several houses and many fields flooded. Downstream: none. Comments on accessibility Powerhouse accessible by 3km road next to power canal along hillside. Other comments To supply Ludewa mini-grid Canal on right river side, with several small thalwegs. Left river side impassable. No future infractructure is foreseen in the coming years. In the light of the field observations, the design output calculated in the former study seems unrealistic. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 69 Firm discharge [m³/s] 0.19 Firm capacity [kW] 109 Firm energy [GWh/yr] 0.95 Operating discharge [m³/s] 0.30 0.70 Installed capacity [kW] 160 400 Annual production [GWh/yr] 1.33 2.85 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.19 Q90% discharge [m³/s] 0.28 Q50% discharge [m³/s] 0.71 Q30% discharge [m³/s] 0.93 Design flood P100 yr [m³/s] 2.75 Catchment area [km²] 104 Hydrological confidence interval Medium SHER s.a. in association with Mhylab Site visit report – December 2016 Page 37 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kelolilo (M-288) - 6. Representative pictures Figure 2 : View from dam site on downstream river valley Figure 3 : Dam site and intake location Figure 4 : River downstream of dam site Figure 5 : River at powerhouse area SHER s.a. in association with Mhylab Site visit report – December 2016 Page 38 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kianda (SF-219) - 10 KIANDA (SF-219) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 32.136 - 8.526 Powerhouse 32.174 - 8.527 1. Administrative and socio-economic data Site code SF-219 Site name Kianda River Kianda Village - Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 242/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.20 Gross head [m] - 700 Installed capacity [kW] - 1,270 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 39 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kianda (SF-219) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme benefiting the head created by multiple large waterfalls. The dam is located in a narrow area. Canal and penstock are on the left riverbank. Canal length [m] 3,922 Tunnel length [m] 0 Penstock length [m] 1 x2,092 Dam type Masonery dam Dam height [m] 5 Dam width [m] 50 Measured turbidity [NTU] 50 Comments on solid transport Sand and pebbles Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.36 (1 penstock(s)) Transmission line length [km] 100.0 Total road length to create [km] 4.8 Total road length to upgrade [km] 1.2 Potential impact of the scheme None Comments on accessibility Easy access Other comments Connection to Sumbawanga minigrid. Canal at left side of the river. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 700 Firm discharge [m³/s] 0.01 Firm capacity [kW] 39 Firm energy [GWh/yr] 0.34 Operating discharge [m³/s] 0.02 0.20 Installed capacity [kW] 100 1,270 Annual production [GWh/yr] 0.82 7.71 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.01 Q90% discharge [m³/s] 0.02 Q50% discharge [m³/s] 0.23 Q30% discharge [m³/s] 0.47 Design flood P100 yr [m³/s] 8.43 Catchment area [km²] 60 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 40 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kianda (SF-219) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : General view of the river, Erosion, Sand deposit and Pebble Figure 4 : Dam site view ,riverbed rocky. Figure 5 : General view of the powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 41 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kigogo (SF-294) - 11 KIGOGO (SF-294) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.243 - 8.682 Powerhouse 35.246 - 8.697 1. Administrative and socio-economic data Site code SF-294 Site name Kigogo River Kigogo Village - Region Iringa Basin Rufiji Topographical map reference Topographical map n° 248/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.40 Gross head [m] - 562 Installed capacity [kW] - 1,930 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 42 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kigogo (SF-294) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Run of the river scheme with canal, penstock and powerhouse on the right riverbank. The powerhouse is located close to the beginning of the irrigation scheme so that water can directly be reinjected in that scheme. Canal length [m] 1,018 Tunnel length [m] 0 Penstock length [m] 1 x1,381 Dam type Masonery dam Dam height [m] 4 Dam width [m] 35 Measured turbidity [NTU] 20 Comments on solid transport None Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.46 (1 penstock(s)) Transmission line length [km] 3.0 Total road length to create [km] 2.0 Total road length to upgrade [km] 0.5 Potential impact of the scheme The irraigation scheme will be affected each time that no water is flowing through the powerhouse (e.g. for maintenance purposes). This could be mitigated if a by-pass is foreseen in the hydropower scheme. Comments on accessibility Difficult access to the intake area as a forest needs to be crossed and no trail exists. Other comments - Canal at the right side of the river. No future infractructure is foreseen in the coming years. An irrigation scheme exists downstream of the project area. The powerhouse location must be such that water is reinjected in the irrigation scheme. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 562 Firm discharge [m³/s] 0.03 Firm capacity [kW] 141 Firm energy [GWh/yr] 1.24 Operating discharge [m³/s] 0.06 0.40 Installed capacity [kW] 290 1,930 Annual production [GWh/yr] 2.41 15.01 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 43 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kigogo (SF-294) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.03 Q90% discharge [m³/s] 0.06 Q50% discharge [m³/s] 0.42 Q30% discharge [m³/s] 0.74 Design flood P100 yr [m³/s] 6.42 Catchment area [km²] 56 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : View of the large waterfall Figure 4 : Irrigation scheme intake Figure 5 : Irrigation scheme and powerhouse area SHER s.a. in association with Mhylab Site visit report – December 2016 Page 44 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kilida (SF-207) - 12 KILIDA (SF-207) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.348 - 7.447 Powerhouse 31.367 - 7.437 1. Administrative and socio-economic data Site code SF-207 Site name Kilida River Kilida Village Kilida village Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 188/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.40 Gross head [m] - 500 Installed capacity [kW] - 1,530 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 45 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kilida (SF-207) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Site probably less economicaly interresting given the hard access conditions and a small watershed leading to a limited flow. A reservoir is not recommended given the solid transport. A long tailrace canal is foreseen so as to reduce the total penstock length. Canal length [m] 0 Tunnel length [m] 1,020 Penstock length [m] 1 x1,753 Dam type Masonery dam Dam height [m] 5 Dam width [m] 30 Measured turbidity [NTU] 150 Comments on solid transport Heavy solid transport Desilting basin size A large sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 0.47 (1 penstock(s)) Transmission line length [km] 60.0 Total road length to create [km] 44.0 Total road length to upgrade [km] 2.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: 4km from the road accros difficult terrain and heavy slopes Powerhouse access: Average: 2km from the road Other comments Connection to Sumbawanga minigrid. No canal possible, rather a tunnel on the right bank seems the only option. No future infractructure is foreseen in the coming years. A reservoir option is not recommanded given the observed solid transport. Site to be compared with Chulu, Lwiche, Muze and Nyembe sites in a prefeasibility study in order to define which one should be further developped to connect to Sumbawanga minigrid. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 500 Firm discharge [m³/s] 0.01 Firm capacity [kW] 61 Firm energy [GWh/yr] 0.53 Operating discharge [m³/s] 0.04 0.40 Installed capacity [kW] 140 1,530 Annual production [GWh/yr] 1.19 9.40 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 46 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kilida (SF-207) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.01 Q90% discharge [m³/s] 0.04 Q50% discharge [m³/s] 0.38 Q30% discharge [m³/s] 0.75 Design flood P100 yr [m³/s] 11.30 Catchment area [km²] 98 Hydrological confidence interval Low 6. Representative pictures Figure 2 : View from downstream. The river falls on the Figure 3 : View on the plains below the escarpment. The escarpment. secondary riverbed shows that heavy floods are to be expected, so is solid transport Figure 4 : Detail of the waterfall Figure 5 : Detail of the waterfall SHER s.a. in association with Mhylab Site visit report – December 2016 Page 47 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kingilikiti (N-011) - 13 KINGILIKITI (N-011) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.971 -11.179 Powerhouse 34.975 -11.184 1. Administrative and socio-economic data Site code N-011 Site name Kingilikiti River Lumeme Village Several villages are located around Kingilikiti Region Ruvuma Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 309/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.70 Gross head [m] - 28 Installed capacity [kW] - 170 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 48 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kingilikiti (N-011) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : A reservoir scheme is not appropriate given the size of the site, hence the scheme is designed as a run of the river scheme. A waterfall on a reduced stretch creates the head necessary for power production. Part of the riverflow is currently diverted through a canal to feed an existing artisanal hydromill. The projected scheme consist in a traditional run of the river scheme with canal, penstock and powerhouse on the right riverbank. Canal length [m] 847 Tunnel length [m] 0 Penstock length [m] 1 x 255 Dam type Masonery dam Dam height [m] 5 Dam width [m] 25 Measured turbidity [NTU] 150 Comments on solid transport Presence of sand in the water Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.85 (1 penstock(s)) Transmission line length [km] 10.0 Total road length to create [km] 1.0 Total road length to upgrade [km] 1.0 Potential impact of the scheme Artisanal hydro mill on the site Comments on accessibility Weir access: Good: 1km from the road Powerhouse access: Good: 1km from the road Other comments The transmission line for this scheme could be developped together with that for the Lumeme scheme and power the Mbinga mini-grid. - No future infractructure is foreseen in the coming years. Lumeme scheme is located about 4km upstream of this site. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 28 Firm discharge [m³/s] 0.13 Firm capacity [kW] 30 Firm energy [GWh/yr] 0.26 Operating discharge [m³/s] 0.20 0.70 Installed capacity [kW] 50 170 Annual production [GWh/yr] 0.41 1.16 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 49 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kingilikiti (N-011) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.13 Q90% discharge [m³/s] 0.21 Q50% discharge [m³/s] 0.74 Q30% discharge [m³/s] 1.07 Design flood P100 yr [m³/s] 4.55 Catchment area [km²] 115 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Vicinity of proposed weir location Figure 3 : View on the waterfall and the existing artisanal hydromill (still in use) Figure 4 : Overview of the waterfall Figure 5 : Site overview SHER s.a. in association with Mhylab Site visit report – December 2016 Page 50 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kishanda (SF-164) - 14 KISHANDA (SF-164) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam - - Powerhouse - - 1. Administrative and socio-economic data Site code SF-164 Site name Kishanda River KISHANDA Village MASHESHE Region Kagera Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 1/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 3.10 Gross head [m] - - Installed capacity [kW] - - SHER s.a. in association with Mhylab Site visit report – December 2016 Page 51 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kishanda (SF-164) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : The site is not suitable for hydropower as no waterfall nor head was found (it is a marshland). Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 1 x 10 Dam type Masonery dam Dam height [m] 0 Dam width [m] 0 Measured turbidity [NTU] 30 Comments on solid transport Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 3.05 (1 penstock(s)) Transmission line length [km] 0.0 Total road length to create [km] 0.3 Total road length to upgrade [km] 0.4 Potential impact of the scheme None Comments on accessibility Easy access to the site Other comments Off grid No future infrastructures can be planned since there is no enough water No flow occur during dry season (Wet Land) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] - Firm discharge [m³/s] 1.77 Firm capacity [kW] - Firm energy [GWh/yr] - Operating discharge [m³/s] 3.10 13.10 Installed capacity [kW] - - Annual production [GWh/yr] 0.02 0.09 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.77 Q90% discharge [m³/s] 3.07 Q50% discharge [m³/s] 13.08 Q30% discharge [m³/s] 20.00 Design flood P100 yr [m³/s] 105.83 Catchment area [km²] 2,637 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 52 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kishanda (SF-164) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river Figure 4 : View on the marshland Figure 5 : View of the cultures around the site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 53 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitandazi II (N-010) - 15 KITANDAZI II (N-010) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.079 -11.019 Powerhouse 35.084 -11.026 1. Administrative and socio-economic data Site code N-010 Site name Kitandazi II River Mbinga Village Just below Kitandazi I, hence possible to connect to the Mbinga grid. Region Ruvuma Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 310/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 1.20 Gross head [m] - 35 Installed capacity [kW] - 330 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 54 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitandazi II (N-010) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : A 35m head is available through a significant slope. The site is located downstream of the under construction Kitandazi I site (Andoya hydropower). The canal will be located on the right embankment and dugged in soft ground. A settling basin will probably be necessary. Canal length [m] 1,199 Tunnel length [m] 0 Penstock length [m] 1 x 290 Dam type Masonery dam Dam height [m] 15 Dam width [m] 30 Measured turbidity [NTU] 30 Comments on solid transport Limited but the watershed is very exposed to agriculture and solid transport might be significant during rainy weather Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.99 (1 penstock(s)) Transmission line length [km] 15.0 Total road length to create [km] 2.0 Total road length to upgrade [km] 2.0 Potential impact of the scheme Limited if run of the river Comments on accessibility Weir access: Good: site located near Kitandazi I. Powerhouse access: Good: site located near Kitandazi I. Other comments Reservoir: Possible Canal on the right embankment, apparently in soft ground. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 35 Firm discharge [m³/s] 0.20 Firm capacity [kW] 58 Firm energy [GWh/yr] 0.51 Operating discharge [m³/s] 0.30 1.20 Installed capacity [kW] 90 330 Annual production [GWh/yr] 0.80 2.26 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 55 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitandazi II (N-010) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.20 Q90% discharge [m³/s] 0.33 Q50% discharge [m³/s] 1.15 Q30% discharge [m³/s] 1.67 Design flood P100 yr [m³/s] 7.06 Catchment area [km²] 180 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Site general layout Figure 3 : View of the river Figure 4 : Exposed watershed Figure 5 : Detailed view of the river flow SHER s.a. in association with Mhylab Site visit report – December 2016 Page 56 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitewaka (M-110) - 16 KITEWAKA (M-110) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.837 -10.352 Powerhouse 34.854 -10.355 1. Administrative and socio-economic data Site code M-110 Site name Kitewaka River Kitewaka Village Hiugai, Nyoma waterfalls Region Njombe Basin Lake Nyasa Topographical map reference Topographical map n° 285/4 (scale 1/50,000) 2. Reference study Study name : Kitewaka Pre-feasibility study Author : Unknown Edition year : Unknown Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 14.40 33.50 Gross head [m] 45 54 Installed capacity [kW] 6,000 14,960 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 57 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitewaka (M-110) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : This site is designed with a dam and a long canal going around the left hill bank towards the forebay. A short penstock goes down to the powerhouse. Although this site will be connected to Ludewa mini-grid, it is recommended to design it, in a first stage for and operating discharge at Q_90% (instead of Q_50%) because the demand is currently too low. Hence, the infrastructure (canal, forebay, penstock and powerhouse) should be designed at the maximum capacity but the electromechanical equipments should be designed for Q_90% only. In a second time, when the demand will increase, the site capacity could be increased by adding turbines in the powerhouse and using a larger part of the flow duration curve. Canal length [m] 3,743 Tunnel length [m] 0 Penstock length [m] 4 x 304 Dam type Masonery dam Dam height [m] 6 Dam width [m] 25 Measured turbidity [NTU] 200 Comments on solid transport Sand and small stones (< 5cm). Very high quantities of sand deposits. Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.15 (4 penstock(s)) Transmission line length [km] 30.0 Total road length to create [km] 17.5 Total road length to upgrade [km] 3.0 Potential impact of the scheme Upstream: small village flooded (<50 persons). Downstream: none. Comments on accessibility Flat roads from Lifua village (for dam) and from Hiugai village (for powerhouse). A bridge will be necessary to ensure access to the powerhouse and dam areas. Other comments To supply Ludewa powered by thermal plant. Canal on the left river bank. Grid extension between Ludewa and Luifa is planned within 3 years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 54 Firm discharge [m³/s] 8.86 Firm capacity [kW] 3,958 Firm energy [GWh/yr] 34.67 Operating discharge [m³/s] 12.80 33.50 Installed capacity [kW] 5,710 14,960 Annual production [GWh/yr] 48.89 106.00 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 58 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitewaka (M-110) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 8.86 Q90% discharge [m³/s] 12.80 Q50% discharge [m³/s] 33.49 Q30% discharge [m³/s] 44.40 Design flood P100 yr [m³/s] 134.22 Catchment area [km²] 2,461 Hydrological confidence interval High 6. Representative pictures Figure 2 : View on dam site and flood area Figure 3 : Dam site Figure 4 : View from dam flood area on river valley Figure 5 : Powerhouse site (on opposite river bank) SHER s.a. in association with Mhylab Site visit report – December 2016 Page 59 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitogota Falls (M-121B) - 17 KITOGOTA FALLS (M-121B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.621 - 1.671 Powerhouse 31.623 - 1.670 1. Administrative and socio-economic data Site code M-121B Site name Kitogota Falls River Kitogota Village - Region Kagera Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 9/1 (scale 1/50,000) 2. Reference study Study name : Reconnaissance Study Mini Hydropower Potential in Kagera Region Draft Report Author : Tanesco Edition year : 2006 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.43 0.80 Gross head [m] 25 25 Installed capacity [kW] 387 160 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 60 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitogota Falls (M-121B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme that could benefit from Kitogota I regulation. A short canal and the penstock are located on the right riverbank. The site is located close to a large waterfall (20m). As crossing of the river is required (approximately at the dam location), future studies should analyze to possibility to create a long masonery-faced earthfilled weir that would replace the existing bridge. Canal length [m] 212 Tunnel length [m] 0 Penstock length [m] 1 x 160 Dam type Masonery dam Dam height [m] 3 Dam width [m] 65 Measured turbidity [NTU] 20 Comments on solid transport None Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.83 (1 penstock(s)) Transmission line length [km] 3.0 Total road length to create [km] 2.4 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility The site is located close to an existing road Other comments Connection to Bukoba minigrid Short canal at right side of the river then penstock. No future infractructure is foreseen in the coming years. Kitogota Falls scheme could benefit from Kitogota I storage. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 25 Firm discharge [m³/s] 0.11 Firm capacity [kW] 23 Firm energy [GWh/yr] 0.21 Operating discharge [m³/s] 0.20 0.80 Installed capacity [kW] 40 160 Annual production [GWh/yr] 0.34 1.08 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 61 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitogota Falls (M-121B) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.11 Q90% discharge [m³/s] 0.20 Q50% discharge [m³/s] 0.79 Q30% discharge [m³/s] 1.18 Design flood P100 yr [m³/s] 5.88 Catchment area [km²] 118 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the river Figure 3 : Large waterfall Figure 4 : Dam site view Figure 5 : View towards downstream where the powerhouse will be located. SHER s.a. in association with Mhylab Site visit report – December 2016 Page 62 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitogota I (M-121A) - 18 KITOGOTA I (M-121A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.601 - 1.693 Powerhouse 31.614 - 1.684 1. Administrative and socio-economic data Site code M-121A Site name Kitogota I River Kitogota Village - Region Kagera Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 9/1 (scale 1/50,000) 2. Reference study Study name : Reconnaissance Study Mini Hydropower Potential in Kagera Region Draft Report Author : Tanesco Edition year : 2006 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.43 2.70 Gross head [m] 25 100 Installed capacity [kW] 387 2,180 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 63 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitogota I (M-121A) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Connected to a mini-grid Scheme description : Daily reservoir that could serve to produce peak energy for the Bukoba minigrid. Water is diverted from the reservoir by a low pressure pipe placed on support blocs on the right riverside. Then a surge chamber is provided and afterwards a high pressure pipe will bring the water to the powerhouse. The daily regulation could also supply Kitogota Falls scheme which is located further downstream. Canal length [m] 1,541 Tunnel length [m] 0 Penstock length [m] 1 x 700 Dam type Earthfill dam Dam height [m] 20 Dam width [m] 300 Measured turbidity [NTU] 20 Comments on solid transport None Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.32 (1 penstock(s)) Transmission line length [km] 0.1 Total road length to create [km] 1.8 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility The powerhouse site is located next to an existing road Other comments Connection to Bukoba minigrid Low pressure pipe (on the right bank) will lead water from the intake to the surge chamber. No future infractructure is foreseen in the coming years. Penstock length include both penstock and head race pipe. Kitogota I could also supply Kitogota Falls. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 100 Firm discharge [m³/s] 0.10 Firm capacity [kW] 74 Firm energy [GWh/yr] 0.70 Operating discharge [m³/s] 0.70 2.70 Installed capacity [kW] 540 2,180 Annual production [GWh/yr] 1.57 4.28 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 64 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kitogota I (M-121A) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.10 Q90% discharge [m³/s] 0.17 Q50% discharge [m³/s] 0.69 Q30% discharge [m³/s] 1.03 Design flood P100 yr [m³/s] 5.14 Catchment area [km²] 104 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Overall view of the site, rocky site. Figure 3 : River cascading over rocks Figure 4 : Dam site view, rock mass Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 65 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kivumilo (SF-041) - 19 KIVUMILO (SF-041) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 38.869 - 4.512 Powerhouse 38.871 - 4.511 1. Administrative and socio-economic data Site code SF-041 Site name Kivumilo River UMBA Village MKOTA Region Tanga Basin Pangani and Northern Indian Ocean Coast Topographical map reference Topographical map n° 110/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 22.10 Gross head [m] - 9 Installed capacity [kW] - 1,640 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 66 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kivumilo (SF-041) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Very good site opportunity with one fall and several rapids on a short distance. The proposed layout is to construct a dam at main water fall and to convey water to power house direct using a penstock pipe. However, the accurate location of facilities must be carefully studied in order to find the best locations.The site is good opportunity for power generation, though currently the river is dry but it has water for up to eigtht months of the year. An option with a storage dam should be studied in the next stages but the sediment issue must be carrefully studied. Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 3 x 358 Dam type Concrete dam Dam height [m] 4 Dam width [m] 120 Measured turbidity [NTU] Comments on solid transport No sand deposit Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.98 (3 penstock(s)) Transmission line length [km] 35.0 Total road length to create [km] 6.0 Total road length to upgrade [km] 6.0 Potential impact of the scheme Very minimum impact Comments on accessibility The distance is from the site to Village Centre where power will be distributed Other comments To supply the National Grid No canal will be constructructed. The proposed design is to connect the penstock pipe directly to the dam to convey water to the turbines from the dam located on the right riverbank. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 9 Firm discharge [m³/s] 3.89 Firm capacity [kW] 289 Firm energy [GWh/yr] 2.54 Operating discharge [m³/s] 6.30 22.10 Installed capacity [kW] 470 1,640 Annual production [GWh/yr] 3.98 13.34 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 67 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kivumilo (SF-041) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 3.89 Q90% discharge [m³/s] 6.29 Q50% discharge [m³/s] 22.07 Q30% discharge [m³/s] 31.89 Design flood P100 yr [m³/s] 135.17 Catchment area [km²] 5,490 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : View of the rock escarpment at the dam site Figure 3 : View of the river Figure 4 : Detailed view of the rock escarpement Figure 5 : Detailed view of the riverbank SHER s.a. in association with Mhylab Site visit report – December 2016 Page 68 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Komungu (SF-144) - 20 KOMUNGU (SF-144) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam - - Powerhouse - - 1. Administrative and socio-economic data Site code SF-144 Site name Komungu River MSANGAZI Village KOMUNGU Region Tanga Basin Pangani and Northern Indian Ocean Coast Topographical map reference Topographical map n° 149/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 12.50 Gross head [m] - - Installed capacity [kW] - - SHER s.a. in association with Mhylab Site visit report – December 2016 Page 69 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Komungu (SF-144) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The site is not good for power generation since the area is almost flat with no head is availble in the area, two rivers, Kwale and Msangazi meet at this point and covered with heavy forest and the rivers are dry. No option identified for power generation in this site. Furthermore, river is dry there is no water. Historical data collected from the indigenous the stream is intermittent whereby water is available during the rain season and stay for short time. Canal length [m] - Tunnel length [m] - Penstock length [m] 2 x 10 Dam type Concrete dam Dam height [m] - Dam width [m] - Measured turbidity [NTU] - Comments on solid transport Sand deposite s were observed Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 4.15 (2 penstock(s)) Transmission line length [km] 5.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 5.0 Potential impact of the scheme Very minimal or no environmental impacts. Comments on accessibility The distance is from the site to main road going to Mkata-Mkalamo Other comments - The site is not suitable for power generation No future infrastructure can be planned 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] - Firm discharge [m³/s] 0.93 Firm capacity [kW] - Firm energy [GWh/yr] - Operating discharge [m³/s] 1.90 12.50 Installed capacity [kW] - - Annual production [GWh/yr] 0.01 0.07 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 70 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Komungu (SF-144) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.93 Q90% discharge [m³/s] 1.91 Q50% discharge [m³/s] 12.54 Q30% discharge [m³/s] 21.77 Design flood P100 yr [m³/s] 189.99 Catchment area [km²] 2,925 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : View on the site at junction between Kwale and Figure 3 : View of the riverbed at the proposed site Msangazi rivers Figure 4 : Detailed view of the river at the proposed site Figure 5 : Kwale River upstream of the site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 71 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kyamato (M-113) - 21 KYAMATO (M-113) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.809 - 1.222 Powerhouse 31.801 - 1.220 1. Administrative and socio-economic data Site code M-113 Site name Kyamato River Kyamato Village Kibengwe Region Kagera Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 3/2 (scale 1/50,000) 2. Reference study Study name : Reconnaissance Study Mini Hydropower Potential in Kagera Region Draft Report Author : Tanesco Edition year : 2006 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 2.02 0.07 Gross head [m] 20 50 Installed capacity [kW] 414 30 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 72 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kyamato (M-113) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme with a low weir. Canal penstock and powerhouse are located on the left riverbank. If crossing of the river is required, future studies should analyze the possibility to create a long masonery-faced earthfilled weir that would serve both as crossing and as river diversion for the hydropower scheme. Canal length [m] 947 Tunnel length [m] 0 Penstock length [m] 1 x 664 Dam type Masonery dam Dam height [m] 2 Dam width [m] 40 Measured turbidity [NTU] 20 Comments on solid transport None Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.31 (1 penstock(s)) Transmission line length [km] 0.5 Total road length to create [km] 0.0 Total road length to upgrade [km] 0.1 Potential impact of the scheme None Comments on accessibility The site is located along an existing road Other comments Connection to Bukoba minigrid Canal at left side of the river then penstock. No future infractructure is foreseen in the coming years. No large waterfalls were found, but many cascades. In the light of the field observations, the design discharge calculated in the former study seems unrealistic. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 50 Firm discharge [m³/s] 0.01 Firm capacity [kW] 4 Firm energy [GWh/yr] 0.03 Operating discharge [m³/s] 0.02 0.07 Installed capacity [kW] 6 30 Annual production [GWh/yr] 0.05 0.19 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 73 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Kyamato (M-113) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.01 Q90% discharge [m³/s] 0.02 Q50% discharge [m³/s] 0.07 Q30% discharge [m³/s] 0.11 Design flood P100 yr [m³/s] 0.57 Catchment area [km²] 11 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site, dirt road towards the Figure 3 : River cascading over rocks powerhouse site Figure 4 : General view of river, dam site Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 74 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lipumba (M-297) - 22 LIPUMBA (M-297) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.012 -10.825 Powerhouse 35.012 -10.825 1. Administrative and socio-economic data Site code M-297 Site name Lipumba River Mngaka Village The habitat is scattered around the site. Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 298/3 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 2.21 2.20 Gross head [m] 25 4 Installed capacity [kW] 868 70 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 75 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lipumba (M-297) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : This site is not favorable for hydropower production since no natural head is available. Altough the average river slope is important inducing significant water velocities in the river, this slope would be difficult to use for hydropower purpose and the only way to generate power is to create an artificial head with a weir. However, given the existing solid transport, such a scheme might not be a good option. Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 1 x 58 Dam type Masonery dam Dam height [m] 5 Dam width [m] 40 Measured turbidity [NTU] 200 Comments on solid transport Transport of sand is visible Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.62 (1 penstock(s)) Transmission line length [km] 10.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 2.0 Potential impact of the scheme None Comments on accessibility Weir access: Average: not far from the main road, but topographically hilly. Powerhouse access: idem. Other comments Connection to Mbinga minigrid - No future infractructure is foreseen in the coming years. Site not favorable because only a dam might create the head, which is not recommended due to the important solid transport. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 4 Firm discharge [m³/s] 0.39 Firm capacity [kW] 13 Firm energy [GWh/yr] 0.11 Operating discharge [m³/s] 0.60 2.20 Installed capacity [kW] 20 70 Annual production [GWh/yr] 0.18 0.49 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 76 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lipumba (M-297) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.39 Q90% discharge [m³/s] 0.63 Q50% discharge [m³/s] 2.19 Q30% discharge [m³/s] 3.17 Design flood P100 yr [m³/s] 13.43 Catchment area [km²] 350 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : General view of the river's surroundings Figure 3 : Detailed view of the river Figure 4 : View of possible location for small dam Figure 5 : View of the river at the dam location SHER s.a. in association with Mhylab Site visit report – December 2016 Page 77 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Litembo Extension (M-298B) - 23 LITEMBO EXTENSION (M-298B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.830 -10.975 Powerhouse 34.821 -10.968 1. Administrative and socio-economic data Site code M-298B Site name Litembo Extension River Ndumbi Village Litembo Mission Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 297/4 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] Unknown 0.20 Gross head [m] Unknown 25 Installed capacity [kW] Unknown 50 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 78 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Litembo Extension (M-298B) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Off-grid Scheme description : Water is collected at the outlet of the existing powerhouse and conveyed on the left riverbank. As the sediment issue will be handled in the first part of the cascade scheme, no sand trap is required. Canal length [m] 1,331 Tunnel length [m] 0 Penstock length [m] 1 x 162 Dam type No dam Dam height [m] 0 Dam width [m] 0 Measured turbidity [NTU] 300 Comments on solid transport Sand Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.51 (1 penstock(s)) Transmission line length [km] 1.2 Total road length to create [km] 0.0 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility Existing access for the existing powerhouse where water is taken. A road is located at the future powerhouse site. Other comments This site constitutes a cascade scheme with the existing powerplant in order to increase the capacity of the Litembo isolated grid. Canal on the left riverbank. No grid extention is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 25 Firm discharge [m³/s] 0.04 Firm capacity [kW] 8 Firm energy [GWh/yr] 0.07 Operating discharge [m³/s] 0.20 0.90 Installed capacity [kW] 50 180 Annual production [GWh/yr] 0.11 0.31 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 79 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Litembo Extension (M-298B) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.04 Q90% discharge [m³/s] 0.06 Q50% discharge [m³/s] 0.22 Q30% discharge [m³/s] 0.32 Design flood P100 yr [m³/s] 1.33 Catchment area [km²] 34 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Upper dam (Litembo Existing) Figure 3 : Upstream existing small reservoir (Litembo Existing) Figure 4 : Existing Penstock and Powerhouse (Litembo Existing) Figure 5 : View of the Ndumbi valley SHER s.a. in association with Mhylab Site visit report – December 2016 Page 80 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luaita (M-299) - 24 LUAITA (M-299) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.979 -10.963 Powerhouse 34.971 -10.942 1. Administrative and socio-economic data Site code M-299 Site name Luaita River Luaita Village Mbinga Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 297/4 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 0.91 0.30 Gross head [m] 44 70 Installed capacity [kW] 400 200 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 81 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luaita (M-299) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Site with an existing mechanical mill turbine that uses only part of the site potential. A new scheme consiting of a small concrete dam and canal, penstock and powerhouse on the left bank (deep tributary on the right bank) can be created. A daily reservoir could be considered but requests a impact analysis on upstream on irrigated area. Canal length [m] 3,130 Tunnel length [m] 0 Penstock length [m] 1 x 526 Dam type Masonery dam Dam height [m] 3 Dam width [m] 10 Measured turbidity [NTU] 30 Comments on solid transport Low sediment load observed Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.56 (1 penstock(s)) Transmission line length [km] 3.0 Total road length to create [km] 0.0 Total road length to upgrade [km] 0.5 Potential impact of the scheme No or few environmental impact exept that an existing mill turbine is located at the dam site. A solution could be to foresee a dedicated flow for the mill turbine in the new scheme. Comments on accessibility Access for both powerhouse and dam is very easy. The site is located 3.5 km from the A19. Other comments Line is supposed to be connected to the Mbinga/Songea mini-grid The feasibility study must analyse the option of trapezoidal earth or concrete lined canal strech (cheaper) in some part of the canal trace. No future infractructure is foreseen in the coming years. Future studies should give a particular attention to the current use of the mill turbine and should make sure sufficient water is dedicated fot its use. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 70 Firm discharge [m³/s] 0.06 Firm capacity [kW] 35 Firm energy [GWh/yr] 0.31 Operating discharge [m³/s] 0.10 0.30 Installed capacity [kW] 60 200 Annual production [GWh/yr] 0.48 1.35 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 82 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luaita (M-299) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.06 Q90% discharge [m³/s] 0.10 Q50% discharge [m³/s] 0.35 Q30% discharge [m³/s] 0.50 Design flood P100 yr [m³/s] 2.12 Catchment area [km²] 54 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Dam site Figure 3 : Existing mill turbine (Francis Turbine) Figure 4 : Existing power canal Figure 5 : Tailrace canal site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 83 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lubare (M-119) - 25 LUBARE (M-119) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.167 - 1.739 Powerhouse 31.172 - 1.717 1. Administrative and socio-economic data Site code M-119 Site name Lubare River Lubare Village Kibogoizi Region Kagera Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 8/1 (scale 1/50,000) 2. Reference study Study name : Reconnaissance Study Mini Hydropower Potential in Kagera Region Draft Report Author : Tanesco Edition year : 2006 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 3.83 0.02 Gross head [m] 90 125 Installed capacity [kW] 3,216 20 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 84 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lubare (M-119) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : Run of the river scheme with an earthfilled dam which the masonery lined weir will serve as crossing place for vehicules. Canal, penstock and powerhouse on the left riverbank. One main waterfall (15 m) was observed. Canal length [m] 2,593 Tunnel length [m] 0 Penstock length [m] 1 x 294 Dam type Earthfill dam Dam height [m] 3 Dam width [m] 40 Measured turbidity [NTU] 20 Comments on solid transport Pebbles Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.14 (1 penstock(s)) Transmission line length [km] 6.0 Total road length to create [km] 1.3 Total road length to upgrade [km] 1.2 Potential impact of the scheme None Comments on accessibility - Other comments To feed Nyaishozi and Ihembe load centers Canal at left side of the river. No future infractructure is foreseen in the coming years. In the light of the field observations and preliminary hydrological model, the design discharge calculated in the former study seems unrealistic. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 125 Firm discharge [m³/s] 0.01 Firm capacity [kW] 12 Firm energy [GWh/yr] 0.11 Operating discharge [m³/s] 0.02 0.09 Installed capacity [kW] 20 90 Annual production [GWh/yr] 0.17 0.71 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 85 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lubare (M-119) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.01 Q90% discharge [m³/s] 0.02 Q50% discharge [m³/s] 0.09 Q30% discharge [m³/s] 0.13 Design flood P100 yr [m³/s] 0.70 Catchment area [km²] 18 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : View of the waterfalls Figure 4 : Dam site view, presence of pebble Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 86 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luegere (SF-022) - 26 LUEGERE (SF-022) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 30.029 - 5.895 Powerhouse 30.011 - 5.900 1. Administrative and socio-economic data Site code SF-022 Site name Luegere River LUEGERE Village LOKOMA Region Kigoma Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 132/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 14.50 Gross head [m] - 159 Installed capacity [kW] - 19,010 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 87 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luegere (SF-022) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Large river with large waterfalls, probably with big flow during the rainy season. A small dam will divert water into a canal located on the left riverbank. Canal length [m] 3,477 Tunnel length [m] 0 Penstock length [m] 2 x 864 Dam type Masonery dam Dam height [m] 3 Dam width [m] 75 Measured turbidity [NTU] 50 Comments on solid transport Bedload of pebble Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.89 (2 penstock(s)) Transmission line length [km] 125.0 Total road length to create [km] 3.6 Total road length to upgrade [km] 1.0 Potential impact of the scheme None Comments on accessibility - Other comments To supply Kigoma Minigrid, the towns along the Tanganyika Lake and feed the Mahale National Park facilities Canal on the left side of the river Water Treatment Plant in construction upstream of the site 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 159 Firm discharge [m³/s] 6.90 Firm capacity [kW] 9,037 Firm energy [GWh/yr] 79.16 Operating discharge [m³/s] 8.50 14.50 Installed capacity [kW] 11,100 19,010 Annual production [GWh/yr] 95.92 145.35 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 6.90 Q90% discharge [m³/s] 8.47 Q50% discharge [m³/s] 14.51 Q30% discharge [m³/s] 16.99 Design flood P100 yr [m³/s] 31.54 Catchment area [km²] 1,320 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 88 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luegere (SF-022) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river Figure 4 : View of the large waterfall and the dam site Figure 5 : View on the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 89 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luika (M-277) - 27 LUIKA (M-277) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.553 -10.066 Powerhouse 34.549 -10.070 1. Administrative and socio-economic data Site code M-277 Site name Luika River Luika Village Lupingu Region Njombe Basin Lake Nyasa Topographical map reference Topographical map n° 285/1 (scale 1/50,000) 2. Reference study Study name : List for Feasibility Study Author : REA Edition year : 2009 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 9.88 0.40 Gross head [m] 50 58 Installed capacity [kW] 4,218 200 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 90 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luika (M-277) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Dam and intake at top of waterfall, with a tunnel leading to the other hill side. From there, a penstock will lead water to the powerhouse. Canal length [m] 0 Tunnel length [m] 380 Penstock length [m] 1 x 257 Dam type Masonery dam Dam height [m] 6 Dam width [m] 25 Measured turbidity [NTU] 40 Comments on solid transport Large stones (>20cm). Desilting basin size No sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 0.57 (1 penstock(s)) Transmission line length [km] 15.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 27.0 Potential impact of the scheme None Comments on accessibility Lupingu village only reacheable via 27km bad and mountaneous dirt road (4x4 only). Powerhouse easily accessible from Lupingu. Weir access is extremely difficult: from powerhouse in Lupingu village, no road but accessible through mountain trail on foot, 2 Other comments 33kV to supply Ludewa mini-grid powered by Thermal plant. Or to supply Lupingo mission isolated grid (1.5 km) Tunnel on the right riverbank. Grid extension between Ludewa and Lupingu is planned within 3 years. In the light of the field observations, the design discharge calculated in the former study seems unrealistic. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 58 Firm discharge [m³/s] 0.11 Firm capacity [kW] 54 Firm energy [GWh/yr] 0.47 Operating discharge [m³/s] 0.20 0.40 Installed capacity [kW] 80 200 Annual production [GWh/yr] 0.65 1.40 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 91 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luika (M-277) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.11 Q90% discharge [m³/s] 0.16 Q50% discharge [m³/s] 0.41 Q30% discharge [m³/s] 0.55 Design flood P100 yr [m³/s] 1.61 Catchment area [km²] 63 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : View of the valley taken from downstream the Figure 3 : Waterfall downstream dam site (10m below). waterfalls, at the powerhouse site. Figure 4 : River halfway between dam site and powerhouse site. Figure 5 : Powerhouse site (out of flood zone) on right river bank where now mais fields. SHER s.a. in association with Mhylab Site visit report – December 2016 Page 92 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lukarasi shp (M-301) - 28 LUKARASI SHP (M-301) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.097 -10.782 Powerhouse 35.120 -10.770 1. Administrative and socio-economic data Site code M-301 Site name Lukarasi shp River Mkurusi Village - Region Ruvuma Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 298/3 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] Unknown 0.20 Gross head [m] Unknown 27 Installed capacity [kW] Unknown 40 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 93 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lukarasi shp (M-301) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme with wide river closure. The canal, penstock and powerhouse run along the left riverbank. The site is located in wetlands and no falls are found along the river. Canal length [m] 2,982 Tunnel length [m] 0 Penstock length [m] 1 x 452 Dam type Masonery dam Dam height [m] 3 Dam width [m] 75 Measured turbidity [NTU] 60 Comments on solid transport Sand Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.51 (1 penstock(s)) Transmission line length [km] 20.0 Total road length to create [km] 0.5 Total road length to upgrade [km] 0.5 Potential impact of the scheme None Comments on accessibility The site is located along an existing road. Other comments Connection to Mbinga minigrid Canal at the left side of the river. No future infractructure is foreseen in the coming years. Future studies should analyze the possibility to make use of lined channel with natural stones, plates or bricks with cement pointing instead of concrete canal. Although the sediment load in the river appears to be low, futur studies should, among others, focus on river basin protection measures and on sediment control. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 27 Firm discharge [m³/s] 0.03 Firm capacity [kW] 7 Firm energy [GWh/yr] 0.06 Operating discharge [m³/s] 0.05 0.20 Installed capacity [kW] 10 40 Annual production [GWh/yr] 0.10 0.28 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 94 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lukarasi shp (M-301) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.03 Q90% discharge [m³/s] 0.05 Q50% discharge [m³/s] 0.18 Q30% discharge [m³/s] 0.27 Design flood P100 yr [m³/s] 1.13 Catchment area [km²] 30 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detail view of the river, signs of erosion Figure 4 : Dam site view, detail view of the river flows Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 95 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lukosi (SF-082) - 29 LUKOSI (SF-082) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 36.192 - 7.728 Powerhouse 36.198 - 7.692 1. Administrative and socio-economic data Site code SF-082 Site name Lukosi River Lukosi Village - Region Iringa Basin Rufiji Topographical map reference Topographical map n° 216/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 7.70 Gross head [m] - 176 Installed capacity [kW] - 11,210 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 96 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lukosi (SF-082) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Run of the river scheme with canal, penstock and powerhouse on the right riverbank. Canal length [m] 5,653 Tunnel length [m] 0 Penstock length [m] 1 x 604 Dam type Masonery dam Dam height [m] 5 Dam width [m] 35 Measured turbidity [NTU] 50 Comments on solid transport Pebbles Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.81 (1 penstock(s)) Transmission line length [km] 5.0 Total road length to create [km] 4.5 Total road length to upgrade [km] 0.3 Potential impact of the scheme None Comments on accessibility Difficult access to the intake area. Other comments - Canal at the right side of the river . No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 176 Firm discharge [m³/s] 1.36 Firm capacity [kW] 1,976 Firm energy [GWh/yr] 17.31 Operating discharge [m³/s] 2.20 7.70 Installed capacity [kW] 3,180 11,210 Annual production [GWh/yr] 27.08 91.10 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.36 Q90% discharge [m³/s] 2.20 Q50% discharge [m³/s] 7.72 Q30% discharge [m³/s] 11.16 Design flood P100 yr [m³/s] 47.29 Catchment area [km²] 1,521 Hydrological confidence interval Medium SHER s.a. in association with Mhylab Site visit report – December 2016 Page 97 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lukosi (SF-082) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detail view of the river flow Figure 4 : River cascading over rocks Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 98 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lupa (SF-189) - 30 LUPA (SF-189) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 33.214 - 8.655 Powerhouse 33.211 - 8.664 1. Administrative and socio-economic data Site code SF-189 Site name Lupa River Lupa Village Scattered habitations in the surroundings Region Mbeya Basin Lake Rukwa Topographical map reference Topographical map n° 244/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 24.10 Gross head [m] - 82 Installed capacity [kW] - 16,360 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 99 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lupa (SF-189) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : The river is part of an important drainage area. It goes 80m down on an escarpment before leaving it. Canal length [m] 1,213 Tunnel length [m] 0 Penstock length [m] 3 x 166 Dam type Masonery dam Dam height [m] 7 Dam width [m] 50 Measured turbidity [NTU] 200 Comments on solid transport Presence of sand, gravel and small stones, showing a high sediment activity. The watershed seems to be intensively cultivated and bare earth is visible. Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.79 (3 penstock(s)) Transmission line length [km] 55.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 22.0 Potential impact of the scheme Limited, since no reservoir is foreseen. Comments on accessibility Weir access: Difficult: long unpaved road and then 4km offroad. A river to be crossed. Powerhouse access: Difficult: long unpaved road and then 4km offroad. A river to be crossed. Other comments - Canal at the right side of the river. No future infractructure is foreseen in the coming years. A reservoir option is not recommanded given the topography of the site (too flat on top). 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 82 Firm discharge [m³/s] 1.13 Firm capacity [kW] 764 Firm energy [GWh/yr] 6.70 Operating discharge [m³/s] 2.60 24.10 Installed capacity [kW] 1,780 16,360 Annual production [GWh/yr] 14.92 124.98 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 100 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lupa (SF-189) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.13 Q90% discharge [m³/s] 2.63 Q50% discharge [m³/s] 24.09 Q30% discharge [m³/s] 46.13 Design flood P100 yr [m³/s] 589.88 Catchment area [km²] 5,886 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : The waterfalls is creatd by a rocky escarpment. Figure 3 : Detail of river within the escarpment. Figure 4 : The last stretch of the waterfalls when the river leaves Figure 5 : Area around the weir. the escarpment SHER s.a. in association with Mhylab Site visit report – December 2016 Page 101 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lupapilo (SF-029) - 31 LUPAPILO (SF-029) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.759 -10.489 Powerhouse 34.753 -10.497 1. Administrative and socio-economic data Site code SF-029 Site name Lupapilo River Ruhuhu Village Lupapilo Region Njombe Basin Lake Nyasa Topographical map reference Topographical map n° 285/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 105.50 Gross head [m] - 30 Installed capacity [kW] - 26,230 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 102 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lupapilo (SF-029) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Medium dam with canal and penstock along the right river bank to the powerhouse site. Unfaforable site due to high level of sediment in the river. Canal length [m] 1,636 Tunnel length [m] 0 Penstock length [m] 11 x 102 Dam type Concrete dam Dam height [m] 20 Dam width [m] 100 Measured turbidity [NTU] 250 Comments on solid transport Sand only, high quantities. Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.20 (11 penstock(s)) Transmission line length [km] 120.0 Total road length to create [km] 11.0 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility Access road lenghts from Lupapilo village. Access from the south (Songea-Manda road) is probably easier but a bridge is required. Other comments To supply Mbinga and Songea mini-grids. A 90 kV line should be planned. Canal on right bank. Grid extension between Ludewa and Luilo is planned within 3 years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 30 Firm discharge [m³/s] 15.32 Firm capacity [kW] 3,810 Firm energy [GWh/yr] 33.38 Operating discharge [m³/s] 26.10 105.50 Installed capacity [kW] 6,490 26,230 Annual production [GWh/yr] 55.13 175.49 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 103 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lupapilo (SF-029) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 15.32 Q90% discharge [m³/s] 26.12 Q50% discharge [m³/s] 105.48 Q30% discharge [m³/s] 158.80 Design flood P100 yr [m³/s] 790.63 Catchment area [km²] 14,618 Hydrological confidence interval High 6. Representative pictures Figure 2 : Dam site and river upstream of dam site Figure 3 : River and slopes downstream of dam site Figure 4 : Powerhouse site Figure 5 : Downstream river from powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 104 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwika I (M-268A) - 32 LUWIKA I (M-268A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.820 -11.095 Powerhouse 34.809 -11.104 1. Administrative and socio-economic data Site code M-268A Site name Luwika I River Luwika/Lualala Village Makwai (downstream) Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 309/2 (scale 1/50,000) 2. Reference study Study name : List for Feasibility Study Author : REA Edition year : 2009 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.50 0.50 Gross head [m] 360 75 Installed capacity [kW] 5,800 290 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 105 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwika I (M-268A) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme with canal, penstock and powerhouse on the left river bank. It constitues the upstream site of a cascade scheme with Luwika II. Canal length [m] 1,730 Tunnel length [m] 0 Penstock length [m] 1 x 382 Dam type Masonery dam Dam height [m] 6 Dam width [m] 50 Measured turbidity [NTU] 200 Comments on solid transport Important solid transport Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.60 (1 penstock(s)) Transmission line length [km] 45.0 Total road length to create [km] 2.8 Total road length to upgrade [km] 1.8 Potential impact of the scheme No or few environmental impact if no reservoir. Comments on accessibility Moderate : 3.5 km walk from a correct trail (12 km from the A19) to be rehabilitated on certain parts. New access road of 2.8 km. Other comments Line is supposed to be connected to the Mbinga mini-grid. A tunnel alternative should be analyzed in further studies, especially if a large dam, intending for a regulation reservoir, is foreseen. An extension of the local grid (Songea) is under progress. A daily reservoir option (with a 8090m high dam) should be analyzed in furture studies. In the light of the field observations and preliminary hydrological model, the design discharge calculated in the former study seems unrealistic. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 75 Firm discharge [m³/s] 0.08 Firm capacity [kW] 50 Firm energy [GWh/yr] 0.44 Operating discharge [m³/s] 0.10 0.50 Installed capacity [kW] 80 290 Annual production [GWh/yr] 0.69 1.96 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 106 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwika I (M-268A) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.08 Q90% discharge [m³/s] 0.13 Q50% discharge [m³/s] 0.47 Q30% discharge [m³/s] 0.68 Design flood P100 yr [m³/s] 2.86 Catchment area [km²] 72 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Dam site Figure 3 : Sand trap site Figure 4 : Upstream sand deposit Figure 5 : River at power house location SHER s.a. in association with Mhylab Site visit report – December 2016 Page 107 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwika II (M-268B) - 33 LUWIKA II (M-268B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.809 -11.104 Powerhouse 34.755 -11.143 1. Administrative and socio-economic data Site code M-268B Site name Luwika II River Luwika/Lualala Village Makwai (downstream) Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 309/2 (scale 1/50,000) 2. Reference study Study name : List for Feasibility Study Author : REA Edition year : 2009 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.50 0.50 Gross head [m] 360 750 Installed capacity [kW] 5,800 3,030 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 108 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwika II (M-268B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme, in cascade with Luwika I. Water is collected from the upstream powerhouse. Future studies should analyse the opportunity to have an alternance between tunnel/canal to reduce the complexity and price for drilling a tunnel. Canal length [m] 0 Tunnel length [m] 2,965 Penstock length [m] 1 x5,169 Dam type No dam Dam height [m] 0 Dam width [m] 0 Measured turbidity [NTU] 200 Comments on solid transport Sand and medium to large stones (< 50 cm). Desilting basin size No sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 0.56 (1 penstock(s)) Transmission line length [km] 17.0 Total road length to create [km] 0.0 Total road length to upgrade [km] 2.9 Potential impact of the scheme No or few environmental impact Comments on accessibility A 2.8 km long road needs to be created to access Luwika I powerhouse (which matches with Luwika II intake). An additionnal 2.9 km long access road has to be created to access Luwika II powerhouse. Other comments Line is supposed to be connected to the Mbinga mini-grid. Tunnel on the left riverbank. Further studies should analyze the feasibility of a shorter penstock. An extension of the local grid (Songea) is under progress. As a cascade scheme, Luwika II requires Luwika I to be errected in a first time. As for Luwika I, the design discharge calculated in the former study seems unrealistic. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 750 Firm discharge [m³/s] 0.09 Firm capacity [kW] 535 Firm energy [GWh/yr] 4.69 Operating discharge [m³/s] 0.10 0.50 Installed capacity [kW] 850 3,030 Annual production [GWh/yr] 7.21 20.58 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 109 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwika II (M-268B) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.09 Q90% discharge [m³/s] 0.14 Q50% discharge [m³/s] 0.50 Q30% discharge [m³/s] 0.73 Design flood P100 yr [m³/s] 3.08 Catchment area [km²] 78 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Intake site (similar to powerhouse Luwika I site) Figure 3 : Waterfalls at halfway Figure 4 : Gorge and view on Lake Nyasa Figure 5 : Typical river profil for the upstream third SHER s.a. in association with Mhylab Site visit report – December 2016 Page 110 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwila (SF-068) - 34 LUWILA (SF-068) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.023 - 5.616 Powerhouse 35.029 - 5.629 1. Administrative and socio-economic data Site code SF-068 Site name Luwila River LUWILA Village SEKEURA Region Singida Basin Northern Lakes Topographical map reference Topographical map n° 142/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 24.00 Gross head [m] - 120 Installed capacity [kW] - 21,750 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 111 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwila (SF-068) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Connected to the main grid Scheme description : The river being dry during the dry season at the site, it has been designed as a seasonly reservoir to provide water at least during part of the dry season. Downstream of this site is the Maparengi site (SF-069) which will benefits of the flow regulation created by Luwila dam. In further studies, those two sites should be developped as a cascade scheme. The scheme consists in a high dam with storage. The intake is located on the right riverbank and diverts water to a canal. The forebay and penstock lead the water to the powerhouse located downstream. Sediment issue is complex for this site and must be analized in details in the next study stages and this scheme sould be analysed as a multi-purpose reservoir (irrigation, reservoir for livestock, hydropower). Given the topography, it is probable that the reservoir will not have enough capacity to provide storage for the whole dry season. Hence, it is probable that this scheme will only be operated part of the year. Moreover, the size of this scheme falls out of the scope of private investors. It should be studied at a national level and included in a master plan if cost effective. Canal length [m] 674 Tunnel length [m] 0 Penstock length [m] 3 x1,301 Dam type Concrete dam Dam height [m] 60 Dam width [m] 1,300 Measured turbidity [NTU] 400 Comments on solid transport Sand deposit Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.21 (3 penstock(s)) Transmission line length [km] 25.0 Total road length to create [km] 2.5 Total road length to upgrade [km] 5.0 Potential impact of the scheme None Comments on accessibility - Other comments To supply the National Grid. Canal at the right side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 120 Firm discharge [m³/s] 0.45 Firm capacity [kW] 328 Firm energy [GWh/yr] 3.53 Operating discharge [m³/s] 3.70 24.00 Installed capacity [kW] 3,300 21,750 Annual production [GWh/yr] 6.94 34.66 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 112 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Luwila (SF-068) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.45 Q90% discharge [m³/s] 0.91 Q50% discharge [m³/s] 6.01 Q30% discharge [m³/s] 10.44 Design flood P100 yr [m³/s] 91.11 Catchment area [km²] 2,176 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Bridge on the river Figure 3 : Detailed view of the river downstream of the site Figure 4 : Dead trees carried by the river during flood events Figure 5 : View of the road downstream of the site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 113 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lwazi (SF-019) - 35 LWAZI (SF-019) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.073 - 8.278 Powerhouse 31.072 - 8.285 1. Administrative and socio-economic data Site code SF-019 Site name Lwazi River Lwazi Village Kipanga Region Rukwa Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 224/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.10 Gross head [m] - 120 Installed capacity [kW] - 2,100 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 114 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lwazi (SF-019) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : A waterfall is preceded by and followed by a high slope allowing a 120m head. The scheme is designed around this waterfall, with a tunnel and a penstocke on the right riverbank.The powerhouse is located at the foot of the waterfall. Canal length [m] 0 Tunnel length [m] 450 Penstock length [m] 1 x 298 Dam type Masonery dam Dam height [m] 5 Dam width [m] 30 Measured turbidity [NTU] 30 Comments on solid transport Limited solid transport visible Desilting basin size A medium sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.01 (1 penstock(s)) Transmission line length [km] 50.0 Total road length to create [km] 33.0 Total road length to upgrade [km] 5.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: long dirt road, then new road to be built to cross a hill Powerhouse access: Average: long dirt road from Kasanga (same as for the weir access) then new stretch on 5km Other comments Connection to the Sumbawanga minigrid. Isolated grid. For future studies, a daily reservoir option should be analyzed. Altough several options are possible, we consider here the option with a tunnel of 450m to be the most optimal. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 120 Firm discharge [m³/s] 0.07 Firm capacity [kW] 65 Firm energy [GWh/yr] 0.57 Operating discharge [m³/s] 0.20 2.10 Installed capacity [kW] 170 2,100 Annual production [GWh/yr] 1.41 12.78 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 115 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lwazi (SF-019) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.07 Q90% discharge [m³/s] 0.17 Q50% discharge [m³/s] 2.12 Q30% discharge [m³/s] 4.43 Design flood P100 yr [m³/s] 79.52 Catchment area [km²] 505 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Near the proposed weir location, difficult terrain Figure 3 : Waterfall Figure 4 : Overview of the valley downstream Figure 5 : Detail of the river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 116 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lwiche (SF-211) - 36 LWICHE (SF-211) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.576 - 7.765 Powerhouse 31.602 - 7.737 1. Administrative and socio-economic data Site code SF-211 Site name Lwiche River Lwiche Village - Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 207/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 5.80 Gross head [m] - 519 Installed capacity [kW] - 24,240 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 117 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lwiche (SF-211) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Connected to a mini-grid Scheme description : Daily operated reservoir to be connected to the Sumbawanga minigrid to supply peak energy. The high dam is built in concrete. Due to very steep sideslopes, the scheme is designed with a tunnel. The intake is located next to the dam and leads water to tunnel and penstock on the right riverbank. Canal length [m] 0 Tunnel length [m] 2,762 Penstock length [m] 1 x2,350 Dam type Concrete dam Dam height [m] 40 Dam width [m] 200 Measured turbidity [NTU] 300 Comments on solid transport Sand and pebbles Desilting basin size No sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.55 (1 penstock(s)) Transmission line length [km] 21.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 1.0 Potential impact of the scheme None Comments on accessibility Difficult access to both intake and powerhouse area. Other comments Connection to Sumbawanga minigrid. Tunnel at right side. No future infractructure is foreseen in the coming years. Site to be compared with Chulu, Kilida, Muze and Nyembe sites in a prefeasibility study in order to define which one should be further developped to connect to Sumbawanga minigrid. A special care should be taken regarding sediment control and solid transport to avoid reservoir filling with sediments. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 519 Firm discharge [m³/s] 0.06 Firm capacity [kW] 241 Firm energy [GWh/yr] 2.17 Operating discharge [m³/s] 0.60 5.80 Installed capacity [kW] 2,370 24,240 Annual production [GWh/yr] 4.96 44.78 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 118 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lwiche (SF-211) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.06 Q90% discharge [m³/s] 0.14 Q50% discharge [m³/s] 1.44 Q30% discharge [m³/s] 2.84 Design flood P100 yr [m³/s] 40.53 Catchment area [km²] 832 Hydrological confidence interval High 6. Representative pictures Figure 2 : Overall view of the site Figure 3 : Detail view of the river, bedload pebble and sand Figure 4 : General view of the dam site Figure 5 : General view of the powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 119 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lyandembela I (SF-109) - 37 LYANDEMBELA I (SF-109) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.108 - 8.292 Powerhouse 35.109 - 8.280 1. Administrative and socio-economic data Site code SF-109 Site name Lyandembela I River Lyandembela Village - Region Iringa Basin Rufiji Topographical map reference Topographical map n° 232/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 6.80 Gross head [m] - 33 Installed capacity [kW] - 1,860 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 120 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lyandembela I (SF-109) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Run of the river scheme with canal, penstock and powerhouse on the right riverbank. Igoma Hydropower project is already in process in this area (Geotechnical test). Canal length [m] 1,571 Tunnel length [m] 0 Penstock length [m] 1 x 328 Dam type Masonery dam Dam height [m] 1 Dam width [m] 25 Measured turbidity [NTU] 40 Comments on solid transport Sand Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.20 (1 penstock(s)) Transmission line length [km] 13.5 Total road length to create [km] 2.0 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility - Other comments Possibility to design one single line that would deserve both Lyandembela I and II. Canal at right side of the river. No future infractructure is foreseen in the coming years. Igoma project is a hydropower project which the intake is located approximately at Lyandembela II and the powerhouse at Lyandemabela I. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 33 Firm discharge [m³/s] 0.62 Firm capacity [kW] 169 Firm energy [GWh/yr] 1.48 Operating discharge [m³/s] 1.20 6.80 Installed capacity [kW] 330 1,860 Annual production [GWh/yr] 2.75 14.61 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 121 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lyandembela I (SF-109) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.62 Q90% discharge [m³/s] 1.20 Q50% discharge [m³/s] 6.83 Q30% discharge [m³/s] 11.38 Design flood P100 yr [m³/s] 84.03 Catchment area [km²] 1,375 Hydrological confidence interval High 6. Representative pictures Figure 2 : General view on the river Figure 3 : View of the waterfalls Figure 4 : Dam site view, rocky site Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 122 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lyandembela II (SF-289) - 38 LYANDEMBELA II (SF-289) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.163 - 8.265 Powerhouse 35.157 - 8.273 1. Administrative and socio-economic data Site code SF-289 Site name Lyandembela II River Lyandembela Village - Region Iringa Basin Rufiji Topographical map reference Topographical map n° 232/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 6.00 Gross head [m] - 33 Installed capacity [kW] - 1,650 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 123 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lyandembela II (SF-289) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Run of the river scheme with canal, penstock and powerhouse on the left riverbank. The bridge upstream the site is inundated several times during the rainy season. Igoma Hydropower project is already in process in this area (Geotechnical test). Canal length [m] 1,817 Tunnel length [m] 0 Penstock length [m] 1 x 142 Dam type Masonery dam Dam height [m] 2 Dam width [m] 50 Measured turbidity [NTU] 40 Comments on solid transport Sand Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.86 (1 penstock(s)) Transmission line length [km] 8.0 Total road length to create [km] 2.0 Total road length to upgrade [km] 2.0 Potential impact of the scheme Inundation of the road Comments on accessibility - Other comments Possibility to design one single line that would deserve both Lyandembela I and II. Canal at right side of the river. No future infractructure is foreseen in the coming years. Igoma project is a hydropower project which the intake is located approximately at Lyandembela II and the powerhouse at Lyandemabela I. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 33 Firm discharge [m³/s] 0.55 Firm capacity [kW] 149 Firm energy [GWh/yr] 1.30 Operating discharge [m³/s] 1.10 6.00 Installed capacity [kW] 290 1,650 Annual production [GWh/yr] 2.44 12.92 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 124 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Lyandembela II (SF-289) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.55 Q90% discharge [m³/s] 1.06 Q50% discharge [m³/s] 6.03 Q30% discharge [m³/s] 10.04 Design flood P100 yr [m³/s] 74.19 Catchment area [km²] 1,214 Hydrological confidence interval High 6. Representative pictures Figure 2 : General view on the river Figure 3 : River cascading over rocks Figure 4 : Dam site Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 125 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mambi (M-221) - 39 MAMBI (M-221) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 39.573 -10.409 Powerhouse 39.604 -10.412 1. Administrative and socio-economic data Site code M-221 Site name Mambi River Mambi Village - Region Lindi Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 295/3 (scale 1/50,000) 2. Reference study Study name : IREP Author : IED Edition year : 2011 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 2.40 2.90 Gross head [m] 140 152 Installed capacity [kW] 2,470 3,560 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 126 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mambi (M-221) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : Run of the river scheme with small weir, powerhouse at the foot of the hill next to the wet and the tailrace water back into the river through the wetland. Canal length [m] 2,830 Tunnel length [m] 0 Penstock length [m] 1 x1,450 Dam type Masonery dam Dam height [m] 3 Dam width [m] 80 Measured turbidity [NTU] 50 Comments on solid transport Sand and pebbles Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.37 (1 penstock(s)) Transmission line length [km] 26.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 2.5 Potential impact of the scheme None Comments on accessibility - Other comments Connection to Mikindani, Nahukahuka and Nyangamara load centers. Canal at the left side of the river. No future infractructure is foreseen in the coming years. An irrigation scheme with retention dam exists upstream of the project area and will affect the hydrology of any future downstream hydropower project. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 152 Firm discharge [m³/s] 1.88 Firm capacity [kW] 2,348 Firm energy [GWh/yr] 20.56 Operating discharge [m³/s] 2.90 8.50 Installed capacity [kW] 3,560 10,620 Annual production [GWh/yr] 30.39 87.61 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 127 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mambi (M-221) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.88 Q90% discharge [m³/s] 2.86 Q50% discharge [m³/s] 8.49 Q30% discharge [m³/s] 11.68 Design flood P100 yr [m³/s] 40.85 Catchment area [km²] 1,481 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detail view of the river flow, bedload pebble Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 128 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Manique (SF-056) - 40 MANIQUE (SF-056) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.819 - 2.535 Powerhouse 35.863 - 2.526 1. Administrative and socio-economic data Site code SF-056 Site name Manique River MANIQUE Village NGARACERO Region Arusha Basin Northern Lakes Topographical map reference Topographical map n° 39/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 5.40 Gross head [m] - 350 Installed capacity [kW] - 15,570 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 129 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Manique (SF-056) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Site with a good potential but complicated access during construction. The foreseen scheme in a run-of-the-river scheme with canal, forebay, penstock and powerhouse on the left riverbank. A long penstock is needed to convey water from the forebay to the powerhouse. The sediment issue must be carrefully analysed and taken into account when calculating the producible. Canal length [m] 2,070 Tunnel length [m] 0 Penstock length [m] 1 x3,929 Dam type Masonery dam Dam height [m] 3 Dam width [m] 30 Measured turbidity [NTU] Comments on solid transport Bedload of pebble Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.76 (1 penstock(s)) Transmission line length [km] 55.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 3.0 Potential impact of the scheme None Comments on accessibility Very difficult to reach during rainy season, All dirt road are available only in dry season (Only Trail road can be create) Other comments To supply Loliondo Minigrid Canal at left side of the river No future infractructure is foreseen in the coming years. Flooding and Erosion problems during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 350 Firm discharge [m³/s] 0.40 Firm capacity [kW] 1,153 Firm energy [GWh/yr] 10.10 Operating discharge [m³/s] 0.80 5.40 Installed capacity [kW] 2,340 15,570 Annual production [GWh/yr] 19.70 99.23 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 130 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Manique (SF-056) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.40 Q90% discharge [m³/s] 0.83 Q50% discharge [m³/s] 5.44 Q30% discharge [m³/s] 9.45 Design flood P100 yr [m³/s] 82.46 Catchment area [km²] 1,289 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the site Figure 4 : Outcropping rocks downstream of the powerhouse site Figure 5 : View of the river - no water available SHER s.a. in association with Mhylab Site visit report – December 2016 Page 131 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Maparengi (SF-069) - 41 MAPARENGI (SF-069) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.038 - 5.743 Powerhouse 35.054 - 5.763 1. Administrative and socio-economic data Site code SF-069 Site name Maparengi River MAPARENGI Village MAKUTAPORA Region Singida Basin Northern Lakes Topographical map reference Topographical map n° 142/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 8.50 Gross head [m] - 150 Installed capacity [kW] - 10,560 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 132 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Maparengi (SF-069) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : This scheme is designed as a run-of-the-river scheme with canal, forebay, penstock and powerhouse on the right riverbank. A small weir will divert water into the canal. This scheme could benefit from flow regulation and storage provided by the Luwila scheme (SF-068) ; those two scheme being considered as a cascade scheme. Canal length [m] 3,661 Tunnel length [m] 0 Penstock length [m] 1 x1,091 Dam type Masonery dam Dam height [m] 3 Dam width [m] 160 Measured turbidity [NTU] 400 Comments on solid transport Sand deposit Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.12 (1 penstock(s)) Transmission line length [km] 15.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 3.0 Potential impact of the scheme None Comments on accessibility - Other comments To supply the National Grid. Canal at the right side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 150 Firm discharge [m³/s] 0.63 Firm capacity [kW] 781 Firm energy [GWh/yr] 6.84 Operating discharge [m³/s] 1.30 8.50 Installed capacity [kW] 1,590 10,560 Annual production [GWh/yr] 13.43 82.07 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.63 Q90% discharge [m³/s] 1.30 Q50% discharge [m³/s] 8.55 Q30% discharge [m³/s] 14.84 Design flood P100 yr [m³/s] 129.50 Catchment area [km²] 3,111 Hydrological confidence interval Medium SHER s.a. in association with Mhylab Site visit report – December 2016 Page 133 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Maparengi (SF-069) - 6. Representative pictures Figure 2 : Detailed view of the river upstream of the site Figure 3 : Detailed view of the river downstream of the site Figure 4 : Bridge across the river Figure 5 : Detailed view of the river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 134 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mara I (SF-052A) - 42 MARA I (SF-052A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.659 - 1.560 Powerhouse 34.644 - 1.581 1. Administrative and socio-economic data Site code SF-052A Site name Mara I River MARA Village NYANSURURA Region Mara Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 14/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 46.60 Gross head [m] - 25 Installed capacity [kW] - 9,630 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 135 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mara I (SF-052A) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Large river with average waterfalls. The site to be developped in a traditionnal run-off-the-river site, with the canal, forebay, penstock and powerhouse on the left riverbank. The river is bordering the Serengeti park and Environmental issues should be firstly debated. Canal length [m] 3,032 Tunnel length [m] 0 Penstock length [m] 5 x 605 Dam type Masonery dam Dam height [m] 5 Dam width [m] 170 Measured turbidity [NTU] 400 Comments on solid transport Bedload of pebble Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.90 (5 penstock(s)) Transmission line length [km] 25.0 Total road length to create [km] 0.6 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility Easy access to weir and powerhouse. Other comments To supply the National Grid. The North Mara Gold Mine (Tarime) could be directly supplied Canal at the left side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May)) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 25 Firm discharge [m³/s] 3.45 Firm capacity [kW] 712 Firm energy [GWh/yr] 6.24 Operating discharge [m³/s] 7.10 46.60 Installed capacity [kW] 1,460 9,630 Annual production [GWh/yr] 12.32 61.36 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 136 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mara I (SF-052A) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 3.45 Q90% discharge [m³/s] 7.09 Q50% discharge [m³/s] 46.63 Q30% discharge [m³/s] 80.99 Design flood P100 yr [m³/s] 706.69 Catchment area [km²] 10,076 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Site of the dam Figure 4 : Detailed view of the river Figure 5 : View on the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 137 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mara II (SF-052B) - 43 MARA II (SF-052B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.642 - 1.588 Powerhouse 34.614 - 1.595 1. Administrative and socio-economic data Site code SF-052B Site name Mara II River MARA Village NYANSURURA Region Mara Basin Kagera and Lake Victoria Topographical map reference Topographical map n° 14/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 46.60 Gross head [m] - 45 Installed capacity [kW] - 17,340 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 138 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mara II (SF-052B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Large river with average waterfalls. The site to be developped in a traditionnal run-off-the-river site, with the canal, forebay, penstock and powerhouse on the right riverbank. The river is bordering the Serengeti park and Environmental issues should be firstly debated. Canal length [m] 4,670 Tunnel length [m] 0 Penstock length [m] 5 x 466 Dam type Masonery dam Dam height [m] 5 Dam width [m] 170 Measured turbidity [NTU] 400 Comments on solid transport Bedload of pebble Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.48 (5 penstock(s)) Transmission line length [km] 20.0 Total road length to create [km] 0.6 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility Easy access to weir and powerhouse. Other comments To supply the National Grid. The North Mara Gold Mine (Tarime) could be directly supplied Canal at the right side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May)) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 45 Firm discharge [m³/s] 3.45 Firm capacity [kW] 1,283 Firm energy [GWh/yr] 11.24 Operating discharge [m³/s] 7.10 46.60 Installed capacity [kW] 2,630 17,340 Annual production [GWh/yr] 22.19 110.52 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 139 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mara II (SF-052B) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 3.45 Q90% discharge [m³/s] 7.09 Q50% discharge [m³/s] 46.63 Q30% discharge [m³/s] 80.99 Design flood P100 yr [m³/s] 706.69 Catchment area [km²] 10,076 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Site of the dam Figure 4 : Detailed view of the river and waterfalls Figure 5 : View on the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 140 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mbagala (SF-277) - 44 MBAGALA (SF-277) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 38.715 -11.049 Powerhouse 38.729 -11.060 1. Administrative and socio-economic data Site code SF-277 Site name Mbagala River Mbagala Village - Region Mtwara Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 317/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 10.70 Gross head [m] - 40 Installed capacity [kW] - 3,530 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 141 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mbagala (SF-277) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme with a wide weir site upstream of two rocky hills (at the confluence between the two rivers). Canal, penstock and powerhouse are located on the left riverbank. Canal length [m] 1,901 Tunnel length [m] 0 Penstock length [m] 2 x 449 Dam type Concrete dam Dam height [m] 5 Dam width [m] 100 Measured turbidity [NTU] 150 Comments on solid transport Sand and pebbles Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.99 (2 penstock(s)) Transmission line length [km] 35.0 Total road length to create [km] 10.6 Total road length to upgrade [km] 5.0 Potential impact of the scheme None Comments on accessibility - Other comments Connection to Mikindani minigrid Canal at left side but further studies should include an economical comparison with a tunnel located on the left riverside. No future infractructure is foreseen in the coming years. Aerial view and pictures of the site show large amounts of sand, future study should analyze solid transport carefully. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 40 Firm discharge [m³/s] 0.14 Firm capacity [kW] 46 Firm energy [GWh/yr] 0.40 Operating discharge [m³/s] 0.50 10.70 Installed capacity [kW] 150 3,530 Annual production [GWh/yr] 1.26 20.80 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 142 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mbagala (SF-277) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.14 Q90% discharge [m³/s] 0.46 Q50% discharge [m³/s] 10.68 Q30% discharge [m³/s] 26.82 Design flood P100 yr [m³/s] 991.63 Catchment area [km²] 3,323 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Bedload sand deposit Figure 4 : Dam site view, rocky site Figure 5 : Rocky riverbed and large rocks carried by the river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 143 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mbawa (SF-UN) - 45 MBAWA (SF-UN) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.757 -11.025 Powerhouse 34.733 -11.065 1. Administrative and socio-economic data Site code SF-UN Site name Mbawa River Mbawa Village Fishermen villages Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 309/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.20 Gross head [m] - 350 Installed capacity [kW] - 450 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 144 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mbawa (SF-UN) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : Many options are possible at this stage. In particular, the intake might be positionned at a different level, optimizing the scheme with the topographical conditions and balancing with available head and discharge. The current scheme is composed of both canal and tunnel on the right riverbank because of the high lateral slopes. Canal length [m] 1,100 Tunnel length [m] 2,790 Penstock length [m] 1 x1,973 Dam type Masonery dam Dam height [m] 10 Dam width [m] 40 Measured turbidity [NTU] 600 Comments on solid transport Significant solid transport and small stones are carried away. Desilting basin size A large sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 0.35 (1 penstock(s)) Transmission line length [km] 45.0 Total road length to create [km] 22.0 Total road length to upgrade [km] 26.0 Potential impact of the scheme Water deviation on a long stretch Comments on accessibility Weir access: Difficult: depending of the weir final position, its access might be very difficult because of the site topography. Powerhouse access: Difficult: the easiest way to access the powerhouse location is from the plain below. Other comments To supply Liuli and Mbamba Bay. Given the high lateral slopes, a canal seems difficult if the whole head is to be used. In that case, a tunnel is probably required. No future infractructure is foreseen in the coming years. Given the high slope of the river, a dam would have a reduced impact, but the storage volume might be reduced as well. This must be further analyzed in the future studies. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 350 Firm discharge [m³/s] 0.10 Firm capacity [kW] 281 Firm energy [GWh/yr] 2.46 Operating discharge [m³/s] 0.20 0.60 Installed capacity [kW] 450 1,610 Annual production [GWh/yr] 3.87 13.11 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 145 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mbawa (SF-UN) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.10 Q90% discharge [m³/s] 0.16 Q50% discharge [m³/s] 0.57 Q30% discharge [m³/s] 0.82 Design flood P100 yr [m³/s] 3.49 Catchment area [km²] 90 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the river's surroundings Figure 3 : General view of the river's surroundings Figure 4 : Detailed view of the river Figure 5 : Possible dam position SHER s.a. in association with Mhylab Site visit report – December 2016 Page 146 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mchakama (SF-123) - 46 MCHAKAMA (SF-123) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 39.265 - 9.106 Powerhouse 39.269 - 9.105 1. Administrative and socio-economic data Site code SF-123 Site name Mchakama River Mavuji Village Mchakama Region Lindi Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 270/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 4.60 Gross head [m] - 5 Installed capacity [kW] - 190 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 147 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mchakama (SF-123) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : The river has no falls in the proposed location. The area surveyed is in the same level but one location is found to be suitable but the head is very low. The site is designed as a run-of-the-river scheme with canal, penstock and powerhouse on the left river bank. It must be noted that, as shown on the site layout representation, the river trace has changed since the topographical maps were established. This site has a low potential for hydropower. However, 2km upstream of the current site, the river passes through a very narrow valley. This shape is ideal for the development of a large scheme with a storage reservoir (for daily or even seasonly operation). The dam could reach from 50m to 70m and the capacity would range from 5 MW to 25 MW (or even more, depending on the use). This is out of the scope of the present atlas and should be analyzed in a detailed study. Canal length [m] 411 Tunnel length [m] 0 Penstock length [m] 1 x 60 Dam type Masonery dam Dam height [m] 4 Dam width [m] 250 Measured turbidity [NTU] 100 Comments on solid transport Sand deposit Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.14 (1 penstock(s)) Transmission line length [km] 10.0 Total road length to create [km] 6.0 Total road length to upgrade [km] 1.0 Potential impact of the scheme None Comments on accessibility The site is located about 6 kilometers from Dar – Lindi main road. Other comments Off grid to supply Kizimbani Canal at left side of the river No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 5 Firm discharge [m³/s] 2.86 Firm capacity [kW] 118 Firm energy [GWh/yr] 1.04 Operating discharge [m³/s] 4.60 16.20 Installed capacity [kW] 190 670 Annual production [GWh/yr] 1.63 5.47 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 148 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mchakama (SF-123) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 2.86 Q90% discharge [m³/s] 4.62 Q50% discharge [m³/s] 16.22 Q30% discharge [m³/s] 23.43 Design flood P100 yr [m³/s] 99.31 Catchment area [km²] 3,002 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 149 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mchakama (SF-123) - 6. Representative pictures Figure 2 : Powerhouse location and sand deposits Figure 3 : Weir location Figure 4 : View of the river upstream of the site Figure 5 : View on the gorge upstream of the proposed site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 150 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi I (SF-208) - 47 MFIZI I (SF-208) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.075 - 7.235 Powerhouse 31.078 - 7.230 1. Administrative and socio-economic data Site code SF-208 Site name Mfizi I River Mfizi Village Scattered habitations in the surroundings Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 188/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.30 Gross head [m] - 40 Installed capacity [kW] - 770 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 151 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi I (SF-208) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : A 40m drop along a limited stretch offers good possibility for hydropower. A reservoir is probably not appropriate given the topographical conditions. The run of the river scheme is developped on the right riverbank. Canal length [m] 627 Tunnel length [m] 0 Penstock length [m] 1 x 303 Dam type Masonery dam Dam height [m] 5 Dam width [m] 40 Measured turbidity [NTU] 200 Comments on solid transport Presence of sand and small stones. Soils exposed due to agriculture Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.32 (1 penstock(s)) Transmission line length [km] 100.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 5.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: 5km from the road, but topographically correct Powerhouse access: Difficult: 5km from the road, but topographically correct Other comments To feed Mpanda mini-grid. A 65kV will have to be created. Canal on the right embankment, probably hard rock on the way. No future infractructure is foreseen in the coming years. If Mfizi I, II and III were to be developped, it could be economically interesting to develop a 100km long transmission line to feed Mpanda minigrid and/or to connect Mpanda and Sumbawanga minigrids together. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 40 Firm discharge [m³/s] 0.02 Firm capacity [kW] 5 Firm energy [GWh/yr] 0.05 Operating discharge [m³/s] 0.06 2.30 Installed capacity [kW] 20 770 Annual production [GWh/yr] 0.17 4.47 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 152 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi I (SF-208) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.02 Q90% discharge [m³/s] 0.06 Q50% discharge [m³/s] 2.35 Q30% discharge [m³/s] 6.78 Design flood P100 yr [m³/s] 434.78 Catchment area [km²] 2,382 Hydrological confidence interval High 6. Representative pictures Figure 2 : Detail of the river showing the high slope Figure 3 : View showing a possible spot for the powerhouse Figure 4 : View of the river near the weir Figure 5 : River between the intake and the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 153 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi II (SF-020) - 48 MFIZI II (SF-020) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.110 - 7.187 Powerhouse 31.114 - 7.178 1. Administrative and socio-economic data Site code SF-020 Site name Mfizi II River Mfizi Village Scattered habitations in the surroundings Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 188/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.50 Gross head [m] - 150 Installed capacity [kW] - 3,040 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 154 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi II (SF-020) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : A clear waterfall creates a drop in elevation over 150m. Dense vegetation on the site and hard rock for excavation. Canal length [m] 627 Tunnel length [m] 0 Penstock length [m] 1 x 913 Dam type Masonery dam Dam height [m] 5 Dam width [m] 50 Measured turbidity [NTU] 200 Comments on solid transport Sand, and stones up to 20 cm radius Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.21 (1 penstock(s)) Transmission line length [km] 100.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 7.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: 7km from the road Powerhouse access: Difficult: 7km from the road Other comments Connection to Mpanda mini-grid and supply of the Katavi facilities. A 90 kV line should be foreseen. Canal on the left embankment, hard rock to be expected. No future infractructure is foreseen in the coming years. If Mfizi I, II and III were to be developped, it could be economically interesting to develop a 100km long transmission line to feed Mpanda minigrid and/or to connect Mpanda and Sumbawanga minigrids together. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 150 Firm discharge [m³/s] 0.02 Firm capacity [kW] 21 Firm energy [GWh/yr] 0.18 Operating discharge [m³/s] 0.07 2.50 Installed capacity [kW] 80 3,040 Annual production [GWh/yr] 0.66 17.55 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 155 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi II (SF-020) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.02 Q90% discharge [m³/s] 0.07 Q50% discharge [m³/s] 2.47 Q30% discharge [m³/s] 7.12 Design flood P100 yr [m³/s] 457.12 Catchment area [km²] 2,505 Hydrological confidence interval High 6. Representative pictures Figure 2 : Waterfall Figure 3 : At the end of the waterfall, near powerhouse site Figure 4 : Powerhouse site (left embankment) Figure 5 : Significant solid transport to be expected SHER s.a. in association with Mhylab Site visit report – December 2016 Page 156 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi III (SF-278) - 49 MFIZI III (SF-278) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.124 - 7.154 Powerhouse 31.129 - 7.147 1. Administrative and socio-economic data Site code SF-278 Site name Mfizi III River Mfizi Village Scattered habitations in the surroundings Region Katavi Basin Lake Rukwa Topographical map reference Topographical map n° 188/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 3.10 Gross head [m] - 30 Installed capacity [kW] - 760 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 157 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi III (SF-278) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The river drops 30m in altitude falling down from the escarpment on the Lake Rukwa plains. It goes through a narrow gorge making it impossible for a canal to be built. Canal length [m] 0 Tunnel length [m] 820 Penstock length [m] 1 x 120 Dam type Masonery dam Dam height [m] 10 Dam width [m] 40 Measured turbidity [NTU] 500 Comments on solid transport Heavy solid transport including stones over 40cm. Desilting basin size A large sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.38 (1 penstock(s)) Transmission line length [km] 100.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 3.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: 4km from the road accros a hill Powerhouse access: Average: 3km from the road Other comments Connection to Mpanda mini-grid and supply of the Katavi facilities. A 90 kV line should be foreseen. No canal possible, rather a tunnel on the left river side seems the only option. No future infractructure is foreseen in the coming years. If Mfizi I, II and III were to be developped, it could be economically interesting to develop a 100km long transmission line to feed Mpanda minigrid and/or to connect Mpanda and Sumbawanga minigrids together. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 30 Firm discharge [m³/s] 0.02 Firm capacity [kW] 5 Firm energy [GWh/yr] 0.05 Operating discharge [m³/s] 0.08 3.10 Installed capacity [kW] 20 760 Annual production [GWh/yr] 0.17 4.39 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 158 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfizi III (SF-278) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.02 Q90% discharge [m³/s] 0.08 Q50% discharge [m³/s] 3.06 Q30% discharge [m³/s] 8.84 Design flood P100 yr [m³/s] 567.12 Catchment area [km²] 3,108 Hydrological confidence interval High 6. Representative pictures Figure 2 : Proposed weir location Figure 3 : View from the proposed weir position down the valley Figure 4 : The water contents suddendly changed during the site Figure 5 : Near possible powerhouse location, out of the gorge visit. We can observe very high solid transport just with the color of water on this picture SHER s.a. in association with Mhylab Site visit report – December 2016 Page 159 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgaka I (M-355A) - 50 MGAKA I (M-355A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.031 -10.712 Powerhouse 35.042 -10.693 1. Administrative and socio-economic data Site code M-355A Site name Mgaka I River Mgaka Village Kigonsera (East) Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 298/1 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 3.82 5.30 Gross head [m] 15 30 Installed capacity [kW] 889 1,300 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 160 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgaka I (M-355A) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The site is not extroardinary but easy to access and to construct. It could be interesting if made with economical technics like concrete faced trapezoidal canal and masonery infrastructure. A masonery dam is suitable. The availability of rocks of good quality must be verified. The scheme is developped on the right riverbank. Canal length [m] 2,318 Tunnel length [m] 0 Penstock length [m] 1 x 420 Dam type Masonery dam Dam height [m] 5 Dam width [m] 75 Measured turbidity [NTU] 300 Comments on solid transport Sand deposit Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.07 (1 penstock(s)) Transmission line length [km] 35.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 2.3 Potential impact of the scheme No or few environmental impact Comments on accessibility The dam access is only at a few meters from a relatively good trail that must be rehabilitated on certain streches. A track (2300 m) bording the canal trace should be easy to implement. Other comments The scheme could be connected to the local mini-grid Mbinga. An economy of scale concerning the trasmission line, construction costs and operation costs is foreseen if Mgaka I and Mgaka II are considered together. Future studies should consider the option of least cost canal streches in earth or lined channel with natural stones or concrete lining. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 30 Firm discharge [m³/s] 1.21 Firm capacity [kW] 299 Firm energy [GWh/yr] 2.62 Operating discharge [m³/s] 1.80 5.30 Installed capacity [kW] 450 1,300 Annual production [GWh/yr] 3.82 9.09 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 161 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgaka I (M-355A) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.21 Q90% discharge [m³/s] 1.81 Q50% discharge [m³/s] 5.26 Q30% discharge [m³/s] 7.18 Design flood P100 yr [m³/s] 24.45 Catchment area [km²] 520 Hydrological confidence interval High 6. Representative pictures Figure 2 : Dam site Figure 3 : Rapids Figure 4 : River bend Figure 5 : Typical river section SHER s.a. in association with Mhylab Site visit report – December 2016 Page 162 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgaka II (M-355B) - 51 MGAKA II (M-355B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.019 -10.652 Powerhouse 35.023 -10.639 1. Administrative and socio-economic data Site code M-355B Site name Mgaka II River Mgaka Village Kigonsera (East) Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 298/1 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 3.82 6.60 Gross head [m] 15 35 Installed capacity [kW] 889 1,900 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 163 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgaka II (M-355B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Good site opportunity with one fall and several rapids on a short distance. The scheme requires a sand trap. The power canal is located on the right bank and must cross a deep tributary (solution : bridge/canal). The accurate dam location and height must be carefully studied in order to find the best locations for the canal and sand trap. If Mgaka II is considered to work simultanously with Mgaka I, then a smaller sand trap could be considered (medium sand trap). Canal length [m] 1,679 Tunnel length [m] 0 Penstock length [m] 1 x 379 Dam type Masonery dam Dam height [m] 10 Dam width [m] 80 Measured turbidity [NTU] 300 Comments on solid transport Sand deposit Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.18 (1 penstock(s)) Transmission line length [km] 35.0 Total road length to create [km] 2.3 Total road length to upgrade [km] 3.3 Potential impact of the scheme No or few environmental impact Comments on accessibility Dam access is computed from the powerhouse new trail comming from a good existing trail located North. Other comments The scheme could be connected to the local mini-grid Mbinga An economy of scale concerning the trasmission line, construction costs and operation costs is foreseen if Mgaka I and Mgaka II are considered together. Future studies will consider the option of least cost canal streches in earth or lined channel with natural stones or concrete lining. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 35 Firm discharge [m³/s] 1.51 Firm capacity [kW] 436 Firm energy [GWh/yr] 3.82 Operating discharge [m³/s] 2.30 6.60 Installed capacity [kW] 650 1,900 Annual production [GWh/yr] 5.58 13.28 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 164 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgaka II (M-355B) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.51 Q90% discharge [m³/s] 2.27 Q50% discharge [m³/s] 6.58 Q30% discharge [m³/s] 8.99 Design flood P100 yr [m³/s] 30.60 Catchment area [km²] 651 Hydrological confidence interval High 6. Representative pictures Figure 2 : View on the Mgaka valley at dam location Figure 3 : Beginning of the falls Figure 4 : End of the falls Figure 5 : Staff gauge at bridge SHER s.a. in association with Mhylab Site visit report – December 2016 Page 165 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgambazi (SF-178) - 52 MGAMBAZI (SF-178) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 29.994 - 5.828 Powerhouse 29.990 - 5.831 1. Administrative and socio-economic data Site code SF-178 Site name Mgambazi River MGAMBAZI Village MGAMBAZI Region Kigoma Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 131/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 3.90 Gross head [m] - 90 Installed capacity [kW] - 2,870 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 166 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgambazi (SF-178) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Large waterfalls (45 m) are found in the vicinity of the site which is thus designed as a run-of-the-river scheme with canal, penstock and powerhouse on the left riverbank. Given the topography, the possibility of a reservoir could be further studied. Canal length [m] 433 Tunnel length [m] 365 Penstock length [m] 1 x 369 Dam type Masonery dam Dam height [m] 5 Dam width [m] 20 Measured turbidity [NTU] 20 Comments on solid transport 1 Desilting basin size A medium sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.43 (1 penstock(s)) Transmission line length [km] 120.0 Total road length to create [km] 1.0 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility - Other comments To supply Kigoma Minigrid, the towns along the Tanganyika Lake and feed the Mahale National Park facilities Canal at the left side of the river Water treatment plant at the food of the waterfall 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 90 Firm discharge [m³/s] 1.84 Firm capacity [kW] 1,363 Firm energy [GWh/yr] 11.94 Operating discharge [m³/s] 2.30 3.90 Installed capacity [kW] 1,670 2,870 Annual production [GWh/yr] 14.44 21.93 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.84 Q90% discharge [m³/s] 2.25 Q50% discharge [m³/s] 3.86 Q30% discharge [m³/s] 4.52 Design flood P100 yr [m³/s] 8.40 Catchment area [km²] 618 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 167 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgambazi (SF-178) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river Figure 4 : View of the waterfall Figure 5 : View on the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 168 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mihima (SF-271) - 53 MIHIMA (SF-271) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 39.157 -10.278 Powerhouse 39.155 -10.291 1. Administrative and socio-economic data Site code SF-271 Site name Mihima River Mihima/Namangale Village - Region Lindi Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 294/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.70 Gross head [m] - 104 Installed capacity [kW] - 590 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 169 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mihima (SF-271) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme with water being diverted in the neighbouring Namangale valley. The canal runs on the right riverbank of the Mihima river while the penstock is on the left side of the Namangale river. Canal length [m] 871 Tunnel length [m] 0 Penstock length [m] 1 x 966 Dam type Masonery dam Dam height [m] 3 Dam width [m] 40 Measured turbidity [NTU] 20 Comments on solid transport None Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.76 (1 penstock(s)) Transmission line length [km] 6.0 Total road length to create [km] 1.5 Total road length to upgrade [km] 1.5 Potential impact of the scheme In the village downstream, Mihima riverwater is used as drinking water Comments on accessibility - Other comments To feed Namangale load center. Canal at the right side of the Mihima river. No future infractructure is foreseen in the coming years. Water being diverted from the Mihima valley to the Namangale valley, future studies should verifiy the ability of the Namangale valley to receive water collected in the Mihima river. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 104 Firm discharge [m³/s] 0.12 Firm capacity [kW] 104 Firm energy [GWh/yr] 0.91 Operating discharge [m³/s] 0.20 0.70 Installed capacity [kW] 170 590 Annual production [GWh/yr] 1.41 3.99 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 170 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mihima (SF-271) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.12 Q90% discharge [m³/s] 0.20 Q50% discharge [m³/s] 0.69 Q30% discharge [m³/s] 1.00 Design flood P100 yr [m³/s] 4.24 Catchment area [km²] 129 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river flow Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 171 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mkalamo (SF-145) - 54 MKALAMO (SF-145) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 38.642 - 5.790 Powerhouse 38.648 - 5.790 1. Administrative and socio-economic data Site code SF-145 Site name Mkalamo River MSANGAZI Village MKALAMO Region Tanga Basin Pangani and Northern Indian Ocean Coast Topographical map reference Topographical map n° 149/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.50 Gross head [m] - 20 Installed capacity [kW] - 420 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 172 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mkalamo (SF-145) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : The site has enough head for power generation the only problem is water, the river is intermittent water is available during rain season and most of the time the river is dry. The site has two small falls and there is existing weir in the falls for supplying water in the village. The second falls is suitable for power generation when water is available. Canal length [m] 647 Tunnel length [m] 0 Penstock length [m] 1 x 161 Dam type Concrete dam Dam height [m] 2 Dam width [m] 75 Measured turbidity [NTU] 50 Comments on solid transport Sand deposite and other solids Desilting basin size A large sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.44 (1 penstock(s)) Transmission line length [km] 5.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 4.0 Potential impact of the scheme Very minimal environmental impacts, there is existing structure in the area Comments on accessibility The site is located at Mkalamo Village in Msangazi River. Mkalamo village is located about 52 kilometers from Mkata along Mkata –Pangani road. The site can easily be accessed but improvement in the access road to reach the site is necessary.The site is lo Other comments This site could supply the off-grid load center of Mkalamo. According to topography low pressure pipe, placed on the right riverbank, will used to convey water from the intake to forebay instead of canal. Further studies is required. No future infrastructures can be planned since there is no enough water 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 20 Firm discharge [m³/s] 1.23 Firm capacity [kW] 204 Firm energy [GWh/yr] 1.78 Operating discharge [m³/s] 2.50 16.60 Installed capacity [kW] 420 2,760 Annual production [GWh/yr] 3.52 21.43 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 173 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mkalamo (SF-145) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 1.23 Q90% discharge [m³/s] 2.53 Q50% discharge [m³/s] 16.65 Q30% discharge [m³/s] 28.92 Design flood P100 yr [m³/s] 252.31 Catchment area [km²] 3,827 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Existing weir and sediments Figure 3 : View on the waterfall Figure 4 : Intake for water supply of the village Figure 5 : Detailed view of the bedrock at the fall SHER s.a. in association with Mhylab Site visit report – December 2016 Page 174 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mlowa (SF-083) - 55 MLOWA (SF-083) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 36.172 - 7.665 Powerhouse 36.189 - 7.669 1. Administrative and socio-economic data Site code SF-083 Site name Mlowa River Mlowa Village - Region Iringa Basin Rufiji Topographical map reference Topographical map n° 216/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.80 Gross head [m] - 117 Installed capacity [kW] - 2,710 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 175 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mlowa (SF-083) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Run of the river scheme in a narrow site with rocky steep slopes but close to a truck road. Canal, penstock and powerhouse on the left riverbank. Canal length [m] 2,221 Tunnel length [m] 0 Penstock length [m] 1 x 641 Dam type Masonery dam Dam height [m] 2 Dam width [m] 25 Measured turbidity [NTU] 500 Comments on solid transport Sand and pebbles Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.28 (1 penstock(s)) Transmission line length [km] 0.7 Total road length to create [km] 0.5 Total road length to upgrade [km] 0.5 Potential impact of the scheme None Comments on accessibility Even if the intake is located close to the asphalted road, its access is difficult due to the steep slope. Other comments - Canal at the left side of the river (not easy with steep slope). No future infractructure is foreseen in the coming years. Special attention should be given to solid transport. The impact of such important solid transport can be mitigated by the use of both a gravel trap (before the intake) and desilting basin (just behing the intake). The dimensions of these should be defined based on the conclusion of a detailed solid transport analysis. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 117 Firm discharge [m³/s] 0.50 Firm capacity [kW] 477 Firm energy [GWh/yr] 4.18 Operating discharge [m³/s] 0.80 2.80 Installed capacity [kW] 770 2,710 Annual production [GWh/yr] 6.53 22.00 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 176 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mlowa (SF-083) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.50 Q90% discharge [m³/s] 0.80 Q50% discharge [m³/s] 2.81 Q30% discharge [m³/s] 4.07 Design flood P100 yr [m³/s] 17.23 Catchment area [km²] 694 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : General view of the site Figure 3 : View of the river flow; important bedload Figure 4 : Dam site, rock masses Figure 5 : Powerhouse site view, old masonry for former irrigation project SHER s.a. in association with Mhylab Site visit report – December 2016 Page 177 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Momba I (SF-017) - 56 MOMBA I (SF-017) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.954 - 8.759 Powerhouse 31.969 - 8.732 1. Administrative and socio-economic data Site code SF-017 Site name Momba I River Momba Village - Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 241/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 11.10 Gross head [m] - 64 Installed capacity [kW] - 5,860 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 178 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Momba I (SF-017) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme in a wide site with two zones of waterfalls. Canal, penstock and powerhouse on the right riverbank. Canal length [m] 2,858 Tunnel length [m] 0 Penstock length [m] 2 x1,327 Dam type Masonery dam Dam height [m] 2 Dam width [m] 75 Measured turbidity [NTU] 100 Comments on solid transport Sand and pebbles Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.15 (2 penstock(s)) Transmission line length [km] 60.0 Total road length to create [km] 0.4 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility - Other comments To feed Sumbawanga mini-grid. A 90 kV line should be foreseen. Canal at right side of the river. No future infractructure is foreseen in the coming years. Further studies should analyze the possibility of using an earthfill dam instead of a masonery dam. The weir could then be lined with stones and serve as crossing for vehicules. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 64 Firm discharge [m³/s] 0.35 Firm capacity [kW] 182 Firm energy [GWh/yr] 1.60 Operating discharge [m³/s] 0.90 11.10 Installed capacity [kW] 470 5,860 Annual production [GWh/yr] 3.94 35.69 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 179 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Momba I (SF-017) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.35 Q90% discharge [m³/s] 0.90 Q50% discharge [m³/s] 11.13 Q30% discharge [m³/s] 23.24 Design flood P100 yr [m³/s] 417.39 Catchment area [km²] 2,683 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : General view of the site, river cascading Figure 3 : General view of the river Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 180 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Momba II (M-070) - 57 MOMBA II (M-070) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 32.376 - 8.792 Powerhouse 32.396 - 8.785 1. Administrative and socio-economic data Site code M-070 Site name Momba II River Momba Village - Region Mbeya Basin Lake Rukwa Topographical map reference Topographical map n° 242/4 (scale 1/50,000) 2. Reference study Study name : The report on pre-feasibility study of small hydropower potential schemes in Morogoro, Iringa, Ruvuma and Mbeya regions - Tanzania Author : Dar Es Salaam Institute of Technology Edition year : 2010 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 6.00 7.40 Gross head [m] 223 355 Installed capacity [kW] 13,380 21,700 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 181 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Momba II (M-070) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Site located in the vicinity of the Yala Falls. It could be considered in later studies as a daily reservoir that could serve to produce peak energy. Water is diverted from the dam by a tunnel on the right riverside. It is followed by a surge chamber, the penstock and the powerhouse. Canal length [m] 0 Tunnel length [m] 1,752 Penstock length [m] 1 x1,313 Dam type Masonery dam Dam height [m] 5 Dam width [m] 40 Measured turbidity [NTU] 100 Comments on solid transport Sand and pebbles Desilting basin size A medium sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.72 (1 penstock(s)) Transmission line length [km] 84.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 6.0 Potential impact of the scheme None Comments on accessibility Difficult access to the powerhouse area. Other comments To feed the national grid Tunnel at right side of the river. No future infractructure is foreseen in the coming years. The head should be carefully determined as the design head was measured at 223 m in two studies (maybe one copying the other). 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 355 Firm discharge [m³/s] 0.15 Firm capacity [kW] 441 Firm energy [GWh/yr] 3.86 Operating discharge [m³/s] 0.40 7.40 Installed capacity [kW] 1,280 21,700 Annual production [GWh/yr] 10.66 161.80 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 182 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Momba II (M-070) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.15 Q90% discharge [m³/s] 0.44 Q50% discharge [m³/s] 7.43 Q30% discharge [m³/s] 16.97 Design flood P100 yr [m³/s] 433.29 Catchment area [km²] 4,978 Hydrological confidence interval High 6. Representative pictures Figure 2 : View taken over the large waterfall Figure 3 : River cascading over rocks Figure 4 : General view of the dam site Figure 5 : General view upstream of the river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 183 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mponde I (SF-305) - 58 MPONDE I (SF-305) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.137 - 5.404 Powerhouse 35.144 - 5.413 1. Administrative and socio-economic data Site code SF-305 Site name Mponde I River MPONDE Village BIRISE Region Singida Basin Northern Lakes Topographical map reference Topographical map n° 123/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 17.00 Gross head [m] - 16 Installed capacity [kW] - 1,780 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 184 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mponde I (SF-305) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Connected to the main grid Scheme description : A small head is found at the site, but the main advantage of this site is the topography that enables the creation of a reservoir for seasonly purpose. This scheme sould be analysed as a multi-purpose reservoir (irrigation, reservoir for livestock, hydropower). This site could be developped in cascade with Mponde II site (SF-067). Mponde I being designed as a seasonly reservoir, it will create storage for both sites and enable water release even during the dry season and thus enable power production during most time of the year. Moreover, sediment issue is complex for this site and must be analized in details in the next study stages. Given the topography, it is probable that the reservoir will not have enough capacity to provide storage for the whole dry season. Hence, it is probable that this scheme will only be operated part of the year. Moreover, the size of this scheme falls out of the scope of private investors. It should be studied at a national level and included in a master plan if cost effective. Canal length [m] 1,902 Tunnel length [m] 0 Penstock length [m] 2 x 198 Dam type Concrete dam Dam height [m] 20 Dam width [m] 600 Measured turbidity [NTU] 400 Comments on solid transport Sand deposit are observed. Particular attention must be given to sediment issue in the next studies. Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.60 (2 penstock(s)) Transmission line length [km] 50.0 Total road length to create [km] 2.5 Total road length to upgrade [km] 3.0 Potential impact of the scheme None Comments on accessibility - Other comments To supply the National Grid. Canal at the right side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 16 Firm discharge [m³/s] 0.31 Firm capacity [kW] 15 Firm energy [GWh/yr] 0.29 Operating discharge [m³/s] 2.60 17.00 Installed capacity [kW] 270 1,780 Annual production [GWh/yr] 0.57 2.83 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 185 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mponde I (SF-305) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.31 Q90% discharge [m³/s] 0.65 Q50% discharge [m³/s] 4.25 Q30% discharge [m³/s] 7.38 Design flood P100 yr [m³/s] 64.36 Catchment area [km²] 1,547 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Rocky river bed Figure 3 : Detailed view of the river close to the site Figure 4 : Detailed view of the river Figure 5 : River and surrounding nature SHER s.a. in association with Mhylab Site visit report – December 2016 Page 186 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mponde II (SF-067) - 59 MPONDE II (SF-067) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.230 - 5.535 Powerhouse 35.247 - 5.555 1. Administrative and socio-economic data Site code SF-067 Site name Mponde II River MPONDE Village MPONDE Region Dodoma Basin Northern Lakes Topographical map reference Topographical map n° 142/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 5.20 Gross head [m] - 95 Installed capacity [kW] - 4,060 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 187 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mponde II (SF-067) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : This run-of-the-river site could be developped in cascade with Mponde I site (SF-305). If Mponde I is designed as a seasonly reservoir, it would create storage for both sites and enable water release even during the dry season and thus enable power production during most time of the year. Particular attention must be given to flooding issues that occur during the wet season. Canal length [m] 4,934 Tunnel length [m] 0 Penstock length [m] 1 x 742 Dam type Masonery dam Dam height [m] 3 Dam width [m] 80 Measured turbidity [NTU] 400 Comments on solid transport Sand deposit Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.77 (1 penstock(s)) Transmission line length [km] 40.0 Total road length to create [km] 18.0 Total road length to upgrade [km] 2.5 Potential impact of the scheme None Comments on accessibility - Other comments To supply the National Grid. Canal at the right side of the river No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 95 Firm discharge [m³/s] 0.38 Firm capacity [kW] 301 Firm energy [GWh/yr] 2.63 Operating discharge [m³/s] 0.80 5.20 Installed capacity [kW] 610 4,060 Annual production [GWh/yr] 5.16 31.55 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.38 Q90% discharge [m³/s] 0.79 Q50% discharge [m³/s] 5.19 Q30% discharge [m³/s] 9.01 Design flood P100 yr [m³/s] 78.62 Catchment area [km²] 1,913 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 188 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mponde II (SF-067) - 6. Representative pictures Figure 2 : Rocky river bed Figure 3 : Detailed view of the river upstream of the site Figure 4 : View of the river Figure 5 : River, outcropping rocks and sand SHER s.a. in association with Mhylab Site visit report – December 2016 Page 189 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muhama (SF-185) - 60 MUHAMA (SF-185) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam - - Powerhouse - - 1. Administrative and socio-economic data Site code SF-185 Site name Muhama River MUHAMA Village MUHAMA Region Geita Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 45/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.50 Gross head [m] - - Installed capacity [kW] - - SHER s.a. in association with Mhylab Site visit report – December 2016 Page 190 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muhama (SF-185) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : No waterfalls nor head is found at this site which is thus not suitable for hydropower development. Canal length [m] - Tunnel length [m] - Penstock length [m] 1 x 10 Dam type Masonery dam Dam height [m] - Dam width [m] - Measured turbidity [NTU] - Comments on solid transport Erosion is visible all over the river strech. Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.37 (1 penstock(s)) Transmission line length [km] 15.0 Total road length to create [km] 1.0 Total road length to upgrade [km] 1.5 Potential impact of the scheme None Comments on accessibility Easy access to the site. Other comments Off grid No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] - Firm discharge [m³/s] 0.23 Firm capacity [kW] - Firm energy [GWh/yr] - Operating discharge [m³/s] 0.50 3.10 Installed capacity [kW] - - Annual production [GWh/yr] - - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.23 Q90% discharge [m³/s] 0.48 Q50% discharge [m³/s] 3.12 Q30% discharge [m³/s] 5.43 Design flood P100 yr [m³/s] 47.35 Catchment area [km²] 666 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 191 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muhama (SF-185) - 6. Representative pictures Figure 2 : View of a swamp upstream the site Figure 3 : Bridge on the river (downstream of the site) Figure 4 : Detailed view of the river upstream of the site Figure 5 : Detailed view of the river downstream of the site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 192 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muhuwezi (SF-266) - 61 MUHUWEZI (SF-266) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 36.945 -10.702 Powerhouse 36.982 -10.703 1. Administrative and socio-economic data Site code SF-266 Site name Muhuwezi River Muhuwezi Village - Region Ruvuma Basin Ruvuma and Southern Indian Ocean Coast Topographical map reference Topographical map n° 301/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 3.10 Gross head [m] - 105 Installed capacity [kW] - 2,680 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 193 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muhuwezi (SF-266) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme with a wide weir, sand trap, canal, penstock and powerhouse on the left riverbank. Given the observed amount of sand, the sand trap is of vital importance for this scheme. Canal length [m] 6,419 Tunnel length [m] 0 Penstock length [m] 1 x 660 Dam type Masonery dam Dam height [m] 3 Dam width [m] 100 Measured turbidity [NTU] 90 Comments on solid transport Considerable deposit of sand Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.37 (1 penstock(s)) Transmission line length [km] 50.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 7.0 Potential impact of the scheme None Comments on accessibility - Other comments Connection to Tunduru minigrid. Canal on the left side. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 105 Firm discharge [m³/s] 0.17 Firm capacity [kW] 149 Firm energy [GWh/yr] 1.30 Operating discharge [m³/s] 0.40 3.10 Installed capacity [kW] 330 2,680 Annual production [GWh/yr] 2.75 16.81 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.17 Q90% discharge [m³/s] 0.38 Q50% discharge [m³/s] 3.10 Q30% discharge [m³/s] 5.73 Design flood P100 yr [m³/s] 63.64 Catchment area [km²] 630 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 194 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muhuwezi (SF-266) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : View of the large waterfall Figure 4 : Dam site view, Presence of sand deposit Figure 5 : Powerhouse site view, Presence of sand deposit SHER s.a. in association with Mhylab Site visit report – December 2016 Page 195 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muyovozi (SF-187) - 62 MUYOVOZI (SF-187) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 30.993 - 3.196 Powerhouse 31.005 - 3.200 1. Administrative and socio-economic data Site code SF-187 Site name Muyovozi River Muyovozi Village - Region Kigoma Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 43/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 12.00 Gross head [m] - 40 Installed capacity [kW] - 3,990 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 196 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muyovozi (SF-187) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Isolated run of the river scheme located on a large river with a wide dam. Canal, penstock and powerhouse are located on the right riverbank. An option with a reservoir should also be analyzed in future studies. Canal length [m] 1,639 Tunnel length [m] 0 Penstock length [m] 2 x 184 Dam type Masonery dam Dam height [m] 10 Dam width [m] 185 Measured turbidity [NTU] 20 Comments on solid transport None Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.85 (2 penstock(s)) Transmission line length [km] 60.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 4.0 Potential impact of the scheme None Comments on accessibility - Other comments To feed Kibundo mini-grid. Canal at the right side of the river. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 40 Firm discharge [m³/s] 2.12 Firm capacity [kW] 702 Firm energy [GWh/yr] 6.15 Operating discharge [m³/s] 3.40 12.00 Installed capacity [kW] 1,130 3,990 Annual production [GWh/yr] 9.65 27.11 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 2.12 Q90% discharge [m³/s] 3.43 Q50% discharge [m³/s] 12.04 Q30% discharge [m³/s] 17.40 Design flood P100 yr [m³/s] 73.74 Catchment area [km²] 2,484 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 197 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muyovozi (SF-187) - 6. Representative pictures Figure 2 : Overall view of the site Figure 3 : Detail view of the river, bedload pebble Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 198 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muze (SF-212) - 63 MUZE (SF-212) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.515 - 7.723 Powerhouse 31.541 - 7.707 1. Administrative and socio-economic data Site code SF-212 Site name Muze River Muze Village Kizungu Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 207/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 1.20 Gross head [m] - 420 Installed capacity [kW] - 4,060 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 199 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muze (SF-212) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The Muze river drops on the escarpment allowing a head of 420m. The river slope ahead of the weir position is too steep for a reservoir to have enough volume, moreover a heavy solid transport is observed. Hence, a run of the river scheme is designed on the right riverbank with a long canal followed by a penstock. Canal length [m] 3,256 Tunnel length [m] 0 Penstock length [m] 1 x1,397 Dam type Masonery dam Dam height [m] 5 Dam width [m] 30 Measured turbidity [NTU] 150 Comments on solid transport Significant sand transport Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.76 (1 penstock(s)) Transmission line length [km] 34.0 Total road length to create [km] 3.0 Total road length to upgrade [km] 1.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Average: 2.5km to the road Powerhouse access: Good: 500m to the road Other comments Connection to Sumbawanga minigrid. Canal 3km long on the right riverbank, with some difficult stretches (feasibility to be assessed). No future infractructure is foreseen in the coming years. This site could be connected to both national grid (34 km) or to the Sumbawanga minigrid (25 km). It should be compared with Chulu, Kilida, Lwiche and Nyembe sites in a prefeasibility study in order to define which one should be further developped to connect to Sumbawanga minigrid. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 420 Firm discharge [m³/s] 0.05 Firm capacity [kW] 158 Firm energy [GWh/yr] 1.38 Operating discharge [m³/s] 0.10 1.20 Installed capacity [kW] 380 4,060 Annual production [GWh/yr] 3.16 24.96 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 200 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Muze (SF-212) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.05 Q90% discharge [m³/s] 0.11 Q50% discharge [m³/s] 1.18 Q30% discharge [m³/s] 2.36 Design flood P100 yr [m³/s] 35.36 Catchment area [km²] 305 Hydrological confidence interval Low 6. Representative pictures Figure 2 : View towards the proposed weir position Figure 3 : Surroundings of proposed weir position Figure 4 : Detail of the river Figure 5 : View from above the escarpment down to the Lake Rukwa SHER s.a. in association with Mhylab Site visit report – December 2016 Page 201 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Myombezi (M-295) - 64 MYOMBEZI (M-295) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.383 - 9.806 Powerhouse 35.391 - 9.815 1. Administrative and socio-economic data Site code M-295 Site name Myombezi River Myombezi Village Lilondi Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 275/4 (scale 1/50,000) 2. Reference study Study name : IREP - GIS - base list Author : IED Edition year : 2013 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] Unknown 0.10 Gross head [m] Unknown 111 Installed capacity [kW] 50 100 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 202 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Myombezi (M-295) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : Run of-the river scheme. Canal on right bank following the hillside to forebay from where penstock goes down to powerhouse. Canal length [m] 1,430 Tunnel length [m] 0 Penstock length [m] 1 x 494 Dam type Masonery dam Dam height [m] 5 Dam width [m] 30 Measured turbidity [NTU] 40 Comments on solid transport No sediments. Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.32 (1 penstock(s)) Transmission line length [km] 10.0 Total road length to create [km] 8.3 Total road length to upgrade [km] 2.0 Potential impact of the scheme Upstream: some small farms (< 10) Downstream: none Comments on accessibility Hilly but not rocky terrain. Other comments To supply the off grid load center of Mahanje Canal on right bank. Grid extension between Njombe and Songea, passing through Lilondo, planned within 3 years. This site is designed, in a first stage, as an offgrid site. In a second stage, when the demand of Mahanje will increase, the site could be adapted to use a larger part of the flow duration curve. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 111 Firm discharge [m³/s] 0.08 Firm capacity [kW] 73 Firm energy [GWh/yr] 0.64 Operating discharge [m³/s] 0.10 0.30 Installed capacity [kW] 100 270 Annual production [GWh/yr] 0.89 2.26 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 203 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Myombezi (M-295) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.08 Q90% discharge [m³/s] 0.12 Q50% discharge [m³/s] 0.30 Q30% discharge [m³/s] 0.39 Design flood P100 yr [m³/s] 1.16 Catchment area [km²] 36 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : River valley between dam site and forebay Figure 3 : Marshlands upstream of dam site Figure 4 : Detail of river at peak discharge Figure 5 : Powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 204 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndembela I (SF-107) - 65 NDEMBELA I (SF-107) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.980 - 8.232 Powerhouse 34.964 - 8.224 1. Administrative and socio-economic data Site code SF-107 Site name Ndembela I River NDEMBELA Village MADIBIRA Region Iringa Basin Rufiji Topographical map reference Topographical map n° 231/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 8.20 Gross head [m] - 100 Installed capacity [kW] - 6,740 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 205 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndembela I (SF-107) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Potentiel site with large waterfalls that will be designed as a run of the river scheme with canal, penstock and powerhouse on the left riverbank. This site is located downstream of Lyandembela I and II (SF-109 and SF-289) and upstream of Ndembela II (SF-108). Igoma Hydropower project is already in process in this area (Geotechnical test). Canal length [m] 4,628 Tunnel length [m] 0 Penstock length [m] 1 x 352 Dam type Masonery dam Dam height [m] 3 Dam width [m] 35 Measured turbidity [NTU] 40 Comments on solid transport Sand deposit Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.92 (1 penstock(s)) Transmission line length [km] 40.0 Total road length to create [km] 0.1 Total road length to upgrade [km] 0.0 Potential impact of the scheme Irrigation dam next to powerhouse site Comments on accessibility The site is located close to the road. Other comments To supply the National Grid. Canal at left side of the river Igoma Hydropower project 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 100 Firm discharge [m³/s] 0.74 Firm capacity [kW] 609 Firm energy [GWh/yr] 5.34 Operating discharge [m³/s] 1.40 8.20 Installed capacity [kW] 1,180 6,740 Annual production [GWh/yr] 9.95 52.84 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.74 Q90% discharge [m³/s] 1.43 Q50% discharge [m³/s] 8.16 Q30% discharge [m³/s] 13.58 Design flood P100 yr [m³/s] 100.27 Catchment area [km²] 1,641 Hydrological confidence interval High SHER s.a. in association with Mhylab Site visit report – December 2016 Page 206 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndembela I (SF-107) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river Figure 4 : View on the site of the dam Figure 5 : View on the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 207 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndembela II (SF-108) - 66 NDEMBELA II (SF-108) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.913 - 8.245 Powerhouse 34.882 - 8.230 1. Administrative and socio-economic data Site code SF-108 Site name Ndembela II River NDEMBELA Village IGOMA Region Iringa Basin Rufiji Topographical map reference Topographical map n° 231/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 8.90 Gross head [m] - 105 Installed capacity [kW] - 7,720 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 208 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndembela II (SF-108) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Potentiel site with large waterfalls that will be designed as a run of the river scheme with canal, penstock and powerhouse on the left riverbank. This site is located downstream of Lyandembela I and II (SF-109 and SF-289) and Ndembela II (SF-108). Igoma Hydropower project is already in process in this area (Geotechnical test). Canal length [m] 5,819 Tunnel length [m] 0 Penstock length [m] 1 x 811 Dam type Masonery dam Dam height [m] 3 Dam width [m] 30 Measured turbidity [NTU] 40 Comments on solid transport Sand deposit Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.22 (1 penstock(s)) Transmission line length [km] 45.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 4.0 Potential impact of the scheme Water Treatment Plant before powerhouse site Comments on accessibility The site is easily accessible by trail. Other comments To supply the National Grid. Canal at left side of the river Igoma Hydropower project 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 105 Firm discharge [m³/s] 0.81 Firm capacity [kW] 698 Firm energy [GWh/yr] 6.11 Operating discharge [m³/s] 1.60 8.90 Installed capacity [kW] 1,350 7,720 Annual production [GWh/yr] 11.38 60.52 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.81 Q90% discharge [m³/s] 1.57 Q50% discharge [m³/s] 8.92 Q30% discharge [m³/s] 14.84 Design flood P100 yr [m³/s] 109.62 Catchment area [km²] 1,794 Hydrological confidence interval High SHER s.a. in association with Mhylab Site visit report – December 2016 Page 209 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndembela II (SF-108) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river Figure 4 : View on the site of the dam Figure 5 : View on the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 210 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndurumo (SF-153) - 67 NDURUMO (SF-153) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.633 - 4.383 Powerhouse 34.606 - 4.385 1. Administrative and socio-economic data Site code SF-153 Site name Ndurumo River NDURUMO Village MISINGI Region Singida Basin Northern Lakes Topographical map reference Topographical map n° 83/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 8.70 Gross head [m] - 85 Installed capacity [kW] - 6,080 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 211 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndurumo (SF-153) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : The scheme is designed as a run-of-the-river scheme with canal, penstock and powerhouse on the right riverbank. However, at this site, the river is dry during the dry season. This site is not recommended for hydropower. Canal length [m] 3,048 Tunnel length [m] 0 Penstock length [m] 1 x 911 Dam type Masonery dam Dam height [m] 5 Dam width [m] 75 Measured turbidity [NTU] 400 Comments on solid transport Bedload of pebble Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 2.33 (1 penstock(s)) Transmission line length [km] 10.0 Total road length to create [km] 8.0 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility The site is located close to an existent dirt road Other comments To supply the National Grid. Canal at right side of the river No future infrastructures can be planned since there is no enough water The underlaying map in the site layout figure is the 1:250.000 topo map. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 85 Firm discharge [m³/s] 0.64 Firm capacity [kW] 449 Firm energy [GWh/yr] 3.94 Operating discharge [m³/s] 1.30 8.70 Installed capacity [kW] 920 6,080 Annual production [GWh/yr] 7.73 47.22 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.64 Q90% discharge [m³/s] 1.32 Q50% discharge [m³/s] 8.67 Q30% discharge [m³/s] 15.06 Design flood P100 yr [m³/s] 131.38 Catchment area [km²] 2,524 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 212 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ndurumo (SF-153) - 6. Representative pictures Figure 2 : View of the site towards the dam Figure 3 : Site at the powerhouse location Figure 4 : View of the river upstream the site Figure 5 : View of the site at the proposed penstock location SHER s.a. in association with Mhylab Site visit report – December 2016 Page 213 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ngongi I (M-267A) - 68 NGONGI I (M-267A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.932 -11.191 Powerhouse 34.926 -11.210 1. Administrative and socio-economic data Site code M-267A Site name Ngongi I River Ngongi Village Mpapa, Mahenge, Arusha, Matoki, Kingilikiti Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 309/2 (scale 1/50,000) 2. Reference study Study name : List for Feasibility Study Author : REA Edition year : 2009 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.09 0.30 Gross head [m] 271 110 Installed capacity [kW] 3,100 310 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 214 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ngongi I (M-267A) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The Ngongi river runs along the road from Mbinga to Mbamba Bay, making this site accessible. The total water drop in elevation from the weir position to the plain downstream is around 460m. However, given the difficult topography, this height is difficult to use in a single scheme. Moreover, a 2-schemes option allows to increase the flow for the second intake significantly (the capted watershed increases by 60%). The canal feasibility needs to be properly assessed, given the difficult topographical conditions, and the final layout choosen accordingly. Ngongi I is the most upstream scheme. It is a traditionnal run of the river scheme with the canal running on the right riverbank and a small penstock feeding the powerhouse. Canal length [m] 2,581 Tunnel length [m] 0 Penstock length [m] 1 x 275 Dam type Masonery dam Dam height [m] 2 Dam width [m] 20 Measured turbidity [NTU] 150 Comments on solid transport Significant solid transport Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.47 (1 penstock(s)) Transmission line length [km] 25.0 Total road length to create [km] 5.0 Total road length to upgrade [km] 2.5 Potential impact of the scheme None Comments on accessibility Weir access: Average: A new road needs to be built across steep slopes on a distance of 5km. Powerhouse access: Good. 2.5km new road Other comments To feed Mbinga mini-grid and surrounding villages. The canal alignment passes through parts of steep slopes and the possiblity of building a canal must be verified in further studies. No future infractructure is foreseen in the coming years. A reservoir alternative is topographically possible, but the transport solid is probably too important for such a scheme. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 110 Firm discharge [m³/s] 0.06 Firm capacity [kW] 55 Firm energy [GWh/yr] 0.48 Operating discharge [m³/s] 0.10 0.30 Installed capacity [kW] 90 310 Annual production [GWh/yr] 0.75 2.12 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 215 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ngongi I (M-267A) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.06 Q90% discharge [m³/s] 0.10 Q50% discharge [m³/s] 0.35 Q30% discharge [m³/s] 0.50 Design flood P100 yr [m³/s] 2.12 Catchment area [km²] 52 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Overview Figure 3 : Detailed view of the river Figure 4 : Exposed watershed Figure 5 : Overview of the downstream surroundings SHER s.a. in association with Mhylab Site visit report – December 2016 Page 216 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ngongi II (M-267B) - 69 NGONGI II (M-267B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.919 -11.217 Powerhouse 34.905 -11.251 1. Administrative and socio-economic data Site code M-267B Site name Ngongi II River Ngongi Village Mbamba bay town Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 309/2 (scale 1/50,000) 2. Reference study Study name : List for Feasibility Study Author : REA Edition year : 2009 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.09 0.60 Gross head [m] 271 290 Installed capacity [kW] 3,100 1,310 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 217 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ngongi II (M-267B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The Ngongi river runs along the road from Mbinga to Mbamba Bay, making this site accessible. The total water drop in elevation from the weir position to the plain downstream is around 460m. However, given the difficult topography, this height is difficult to use in a single scheme. Moreover, a 2-schemes option allows to increase the flow for the second intake significantly (the capted watershed increases by 60%). The canal feasibility needs to be properly assessed, given the difficult topographical conditions, and the final layout choosen accordingly. Ngongi II is the most downstream scheme. Canal, penstock and powerhouse are also placed on the right riverbank. The powerhouse location is defined so as to limitate the penstock length. Hence a long tailrace canal is required. Canal length [m] 1,820 Tunnel length [m] 0 Penstock length [m] 1 x2,916 Dam type Masonery dam Dam height [m] 5 Dam width [m] 30 Measured turbidity [NTU] 150 Comments on solid transport Significant solid transport Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.66 (1 penstock(s)) Transmission line length [km] 30.0 Total road length to create [km] 1.5 Total road length to upgrade [km] 1.0 Potential impact of the scheme None Comments on accessibility Weir access: Good. 1.5km from the main road. Powerhouse access: Good. 1km from the main road Other comments To feed Mbinga mini-grid. The canal alignment passes through parts of steep slopes and the possiblity of building a canal must be verified in further studies. No future infractructure is foreseen in the coming years. A reservoir alternative is topographically possible, but the transport solid is probably too important for such a scheme. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 290 Firm discharge [m³/s] 0.10 Firm capacity [kW] 232 Firm energy [GWh/yr] 2.03 Operating discharge [m³/s] 0.20 0.60 Installed capacity [kW] 370 1,310 Annual production [GWh/yr] 3.13 8.91 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 218 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ngongi II (M-267B) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.10 Q90% discharge [m³/s] 0.16 Q50% discharge [m³/s] 0.56 Q30% discharge [m³/s] 0.81 Design flood P100 yr [m³/s] 3.42 Catchment area [km²] 84 Hydrological confidence interval Medium 6. Representative pictures Figure 2 : Context near weir position Figure 3 : Global view of valley Figure 4 : Exposed watershed Figure 5 : Detail of river downstream SHER s.a. in association with Mhylab Site visit report – December 2016 Page 219 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Nyembe (SF-213) - 70 NYEMBE (SF-213) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 32.014 - 8.326 Powerhouse 32.018 - 8.294 1. Administrative and socio-economic data Site code SF-213 Site name Nyembe River Nyembe Village - Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 226/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.70 Gross head [m] - 684 Installed capacity [kW] - 14,760 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 220 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Nyembe (SF-213) - 3. Technical data Type of scheme foreseen: Daily reservoir Type of connection: Connected to a mini-grid Scheme description : Daily operated reservoir to be connected to the Sumbawanga minigrid to supply peak energy. The high dam is built in concrete. Due to very steep sideslopes, the scheme is designed with a tunnel. The intake is located next to the dam and leads water to tunnel and penstock on the right riverbank. Canal length [m] 0 Tunnel length [m] 1,463 Penstock length [m] 1 x2,380 Dam type Concrete dam Dam height [m] 40 Dam width [m] 315 Measured turbidity [NTU] 20 Comments on solid transport Sand Desilting basin size No sand trap is required Surge tank A surge tank is foreseen Penstock diameter [m] 1.06 (1 penstock(s)) Transmission line length [km] 50.0 Total road length to create [km] 4.0 Total road length to upgrade [km] 1.6 Potential impact of the scheme None Comments on accessibility - Other comments Connection to Sumbawanga minigrid. Tunnel at right side. No future infrastructure is foreseen in the coming years. To be compared with Chulu, Kilida, Lwiche and Muze sites in a prefeasibility study in order to define which one should be further developped to connect to Sumbawanga minigrid. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 684 Firm discharge [m³/s] 0.02 Firm capacity [kW] 114 Firm energy [GWh/yr] 1.02 Operating discharge [m³/s] 0.20 2.70 Installed capacity [kW] 1,170 14,760 Annual production [GWh/yr] 2.45 27.16 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 221 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Nyembe (SF-213) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.02 Q90% discharge [m³/s] 0.05 Q50% discharge [m³/s] 0.67 Q30% discharge [m³/s] 1.39 Design flood P100 yr [m³/s] 25.01 Catchment area [km²] 178 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Overall view of the site Figure 3 : Detail view of the river Figure 4 : General view of the dam site Figure 5 : General view of the powerhouse site, sand deposit, drowned sandbag bridge SHER s.a. in association with Mhylab Site visit report – December 2016 Page 222 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ruchugi (SF-172) - 71 RUCHUGI (SF-172) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 30.421 - 5.022 Powerhouse 30.420 - 5.027 1. Administrative and socio-economic data Site code SF-172 Site name Ruchugi River Ruchugi Village - Region Kigoma Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 113/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 15.60 Gross head [m] - 13 Installed capacity [kW] - 1,680 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 223 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ruchugi (SF-172) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Run of the river scheme benefitting of a 10m waterfall situated in a river bend. Water is directly diverted, on the left river bank, from the intake to an underground penstock heading to the powerhouse. Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 2 x1,067 Dam type Masonery dam Dam height [m] 8 Dam width [m] 250 Measured turbidity [NTU] 100 Comments on solid transport Sand and pebbles, silty water Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 3.32 (2 penstock(s)) Transmission line length [km] 65.0 Total road length to create [km] 0.8 Total road length to upgrade [km] 1.1 Potential impact of the scheme None Comments on accessibility - Other comments To feed Kasulu mini-grid and Uvinza mines. No canal, water is directly send in a penstock, on the left side of the river. No future infractructure is foreseen in the coming years. Future studies should, based on a topographical survey, analyze the possibility of placing the intake further upstream and conveying water through a concrete channel in order to benefit a higher head. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 13 Firm discharge [m³/s] 2.76 Firm capacity [kW] 295 Firm energy [GWh/yr] 2.59 Operating discharge [m³/s] 4.50 15.60 Installed capacity [kW] 480 1,680 Annual production [GWh/yr] 4.06 11.40 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 224 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ruchugi (SF-172) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 2.76 Q90% discharge [m³/s] 4.46 Q50% discharge [m³/s] 15.65 Q30% discharge [m³/s] 22.61 Design flood P100 yr [m³/s] 95.84 Catchment area [km²] 2,816 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detail view of the river Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 225 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ruhuhu (M-127) - 72 RUHUHU (M-127) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 34.805 -10.448 Powerhouse 34.805 -10.448 1. Administrative and socio-economic data Site code M-127 Site name Ruhuhu River Ruhuhu Village - Region Ruvuma Basin Lake Nyasa Topographical map reference Topographical map n° 285/4 (scale 1/50,000) 2. Reference study Study name : Reconnaissance Study for Minihydropower Potential Sites Iringa Region Phase II Author : Tanesco Edition year : 2007 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 59.41 105.20 Gross head [m] 8 15 Installed capacity [kW] 4,056 13,120 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 226 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ruhuhu (M-127) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : Medium dam with small reservoir, the powerhouse is integrated in dam foot. This site is more suitable to medium hydropower scheme. Special care should however be given to solid transport management. Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 11 x 17 Dam type Concrete dam Dam height [m] 20 Dam width [m] 50 Measured turbidity [NTU] 250 Comments on solid transport Sand only, high quantities. Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 3.00 (5 penstock(s)) Transmission line length [km] 25.0 Total road length to create [km] 21.5 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility Good and flat region between Lifua village and dam area where new road is needed. Access from south probably easier (Songea-Manda road) but a bridge is needed. Other comments To supply Mbinga, Ludewa and Songea powered by thermal plant. No canal nor tunnel is required as the powerhouse is located at the toe of the dam. Grid extension between Ludewa and Luifa is planned within 3 years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 15 Firm discharge [m³/s] 15.28 Firm capacity [kW] 1,905 Firm energy [GWh/yr] 16.69 Operating discharge [m³/s] 26.10 105.20 Installed capacity [kW] 3,250 13,120 Annual production [GWh/yr] 27.56 87.73 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 227 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Ruhuhu (M-127) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 15.28 Q90% discharge [m³/s] 26.05 Q50% discharge [m³/s] 105.22 Q30% discharge [m³/s] 158.40 Design flood P100 yr [m³/s] 788.66 Catchment area [km²] 14,582 Hydrological confidence interval High 6. Representative pictures Figure 2 : River upstream of dam site Figure 3 : Dam site and downstream river Figure 4 : Small rapid at dam site Figure 5 : View on downstream river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 228 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Samba (SF-343) - 73 SAMBA (SF-343) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 30.836 - 7.457 Powerhouse 30.818 - 7.468 1. Administrative and socio-economic data Site code SF-343 Site name Samba River Samba Village - Region Rukwa Basin Malagarasi and Lake Tanganyika Topographical map reference Topographical map n° 187/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 0.08 Gross head [m] - 92 Installed capacity [kW] - 60 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 229 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Samba (SF-343) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Off-grid Scheme description : Run of the river scheme with a small but wide masonry dam on a wooded site. Canal, penstock and powerhouse on the left riverbank. Canal length [m] 3,024 Tunnel length [m] 0 Penstock length [m] 1 x 588 Dam type Masonery dam Dam height [m] 4 Dam width [m] 25 Measured turbidity [NTU] 70 Comments on solid transport Sand Desilting basin size No sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.28 (1 penstock(s)) Transmission line length [km] 25.0 Total road length to create [km] 3.5 Total road length to upgrade [km] 0.8 Potential impact of the scheme None Comments on accessibility A road exists in the vicinity of the project. Access to the dam is provided from the bridge on the River. Access to the powerhouse is provided from the next bridge. Other comments Isolated off-grid site connecting Kamwanda and Mtakuja Canal at left side of the river. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 92 Firm discharge [m³/s] 0.03 Firm capacity [kW] 24 Firm energy [GWh/yr] 0.21 Operating discharge [m³/s] 0.08 0.70 Installed capacity [kW] 60 500 Annual production [GWh/yr] 0.47 3.86 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.03 Q90% discharge [m³/s] 0.08 Q50% discharge [m³/s] 0.67 Q30% discharge [m³/s] 1.27 Design flood P100 yr [m³/s] 15.90 Catchment area [km²] 336 Hydrological confidence interval High SHER s.a. in association with Mhylab Site visit report – December 2016 Page 230 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Samba (SF-343) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : General view of the riverflow Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 231 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Samvya (SF-217) - 74 SAMVYA (SF-217) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 31.820 - 8.434 Powerhouse 31.826 - 8.425 1. Administrative and socio-economic data Site code SF-217 Site name Samvya River Samvya Village Ilembo Region Rukwa Basin Lake Rukwa Topographical map reference Topographical map n° 225/4 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.20 Gross head [m] - 85 Installed capacity [kW] - 1,570 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 232 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Samvya (SF-217) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to a mini-grid Scheme description : The Samvya river drops on the escarpment, allowing a 85m gross head. A second waterfall lies below, with a head of 20m in soft soils. The river flow is monitored and locals say it is in the pipe of REA project. this site is not favorable for a reservoir because of the large valley. Canal length [m] 1,749 Tunnel length [m] 0 Penstock length [m] 1 x 229 Dam type Masonery dam Dam height [m] 5 Dam width [m] 30 Measured turbidity [NTU] 150 Comments on solid transport Limited solid transport visible Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.07 (1 penstock(s)) Transmission line length [km] 55.0 Total road length to create [km] 15.0 Total road length to upgrade [km] 4.0 Potential impact of the scheme Limited Comments on accessibility Weir access: Difficult: 4.5km from rural road. Average terrain condition Powerhouse access: Good: 4km from a dirt road Other comments Connection to Sumbawanga minigrid. The canal is located on the left riverbank. Itsfeasibility needs to be assessed on the whole length, given the high lateral slopes. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 85 Firm discharge [m³/s] 0.07 Firm capacity [kW] 49 Firm energy [GWh/yr] 0.43 Operating discharge [m³/s] 0.20 2.20 Installed capacity [kW] 130 1,570 Annual production [GWh/yr] 1.06 9.58 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 233 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Samvya (SF-217) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.07 Q90% discharge [m³/s] 0.18 Q50% discharge [m³/s] 2.24 Q30% discharge [m³/s] 4.68 Design flood P100 yr [m³/s] 84.05 Catchment area [km²] 565 Hydrological confidence interval Low 6. Representative pictures Figure 2 : View showing the situation in the valley Figure 3 : Second waterfall (20m high) Figure 4 : Detail of the river Figure 5 : Flow monitoring system SHER s.a. in association with Mhylab Site visit report – December 2016 Page 234 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Sasimo I (SF-080A) - 75 SASIMO I (SF-080A) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 36.505 - 7.218 Powerhouse 36.506 - 7.230 1. Administrative and socio-economic data Site code SF-080A Site name Sasimo I River SASIMO Village ITIPI Region Dodoma Basin Rufiji Topographical map reference Topographical map n° 199/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.20 Gross head [m] - 60 Installed capacity [kW] - 1,070 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 235 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Sasimo I (SF-080A) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : This scheme is designed as a run-of-the-river scheme with canal, forebay, penstock and powerhouse on the right riverbank. A small weir will divert water into the canal. Next studies should analyse the possibility of developping this scheme in cascade with Sasimo II, which dam and intake are located some 300m downstream. The feasibility of a reservoir could be analysed in further studies. Canal length [m] 1,782 Tunnel length [m] 0 Penstock length [m] 1 x 187 Dam type Masonery dam Dam height [m] 3 Dam width [m] 40 Measured turbidity [NTU] 30 Comments on solid transport Sand deposit Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.10 (1 penstock(s)) Transmission line length [km] 30.0 Total road length to create [km] 1.2 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility Site located next to the road Other comments To supply the National Grid. Canal at the right side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 60 Firm discharge [m³/s] 0.25 Firm capacity [kW] 123 Firm energy [GWh/yr] 1.08 Operating discharge [m³/s] 0.50 2.20 Installed capacity [kW] 220 1,070 Annual production [GWh/yr] 1.89 8.52 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 236 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Sasimo I (SF-080A) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.25 Q90% discharge [m³/s] 0.45 Q50% discharge [m³/s] 2.17 Q30% discharge [m³/s] 3.44 Design flood P100 yr [m³/s] 20.91 Catchment area [km²] 514 Hydrological confidence interval Low 6. Representative pictures Figure 2 : General view of the site Figure 3 : Detailed view of the river Figure 4 : View on the site of the dam Figure 5 : View on the site towards the powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 237 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Sasimo II (SF-080B) - 76 SASIMO II (SF-080B) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 36.508 - 7.230 Powerhouse 36.513 - 7.243 1. Administrative and socio-economic data Site code SF-080B Site name Sasimo II River SASIMO Village ITIPI Region Dodoma Basin Rufiji Topographical map reference Topographical map n° 199/1 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 2.20 Gross head [m] - 110 Installed capacity [kW] - 1,970 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 238 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Sasimo II (SF-080B) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : This scheme is designed as a run-of-the-river scheme with canal, forebay, penstock and powerhouse on the right riverbank. A small weir will divert water into the canal.Next studies should analyse the possibility of developping this scheme in cascade with Sasimo I, which powerhouse is located some 300m upstream of the dam. Canal length [m] 1,972 Tunnel length [m] 0 Penstock length [m] 1 x 323 Dam type Masonery dam Dam height [m] 3 Dam width [m] 35 Measured turbidity [NTU] 30 Comments on solid transport Sand deposit Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 1.05 (1 penstock(s)) Transmission line length [km] 30.0 Total road length to create [km] 1.2 Total road length to upgrade [km] 0.0 Potential impact of the scheme None Comments on accessibility Site located next to the road Other comments To supply the National Grid. Canal at the right side of the river No future infractructure is foreseen in the coming years. Flooding problem during the rainy season (November to May) 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 110 Firm discharge [m³/s] 0.25 Firm capacity [kW] 225 Firm energy [GWh/yr] 1.97 Operating discharge [m³/s] 0.50 2.20 Installed capacity [kW] 410 1,970 Annual production [GWh/yr] 3.45 15.59 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.25 Q90% discharge [m³/s] 0.45 Q50% discharge [m³/s] 2.17 Q30% discharge [m³/s] 3.44 Design flood P100 yr [m³/s] 20.91 Catchment area [km²] 514 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 239 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Sasimo II (SF-080B) - 6. Representative pictures Figure 2 : View on the site towards the dam site Figure 3 : Global view of the site Figure 4 : View on the waterfalls Figure 5 : View towards the site of the powerhouse SHER s.a. in association with Mhylab Site visit report – December 2016 Page 240 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Vambanungwi (SF-296) - 77 VAMBANUNGWI (SF-296) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 35.054 - 8.763 Powerhouse 35.057 - 8.769 1. Administrative and socio-economic data Site code SF-296 Site name Vambanungwi River Vambanungwi Village - Region Iringa Basin Rufiji Topographical map reference Topographical map n° 248/3 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 1.00 Gross head [m] - 110 Installed capacity [kW] - 890 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 241 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Vambanungwi (SF-296) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : Run of the river scheme with canal, penstock and powerhouse on the left riverbank. It benefits from a waterfall. Special care should be taken regarding sediments control. Canal length [m] 801 Tunnel length [m] 0 Penstock length [m] 1 x 424 Dam type Masonery dam Dam height [m] 5 Dam width [m] 50 Measured turbidity [NTU] 200 Comments on solid transport Sand Desilting basin size A large sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 0.78 (1 penstock(s)) Transmission line length [km] 1.5 Total road length to create [km] 5.0 Total road length to upgrade [km] 3.0 Potential impact of the scheme None Comments on accessibility - Other comments - Canal at the left side of the river. No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 110 Firm discharge [m³/s] 0.07 Firm capacity [kW] 66 Firm energy [GWh/yr] 0.58 Operating discharge [m³/s] 0.10 1.00 Installed capacity [kW] 130 890 Annual production [GWh/yr] 1.12 6.89 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.07 Q90% discharge [m³/s] 0.15 Q50% discharge [m³/s] 0.98 Q30% discharge [m³/s] 1.71 Design flood P100 yr [m³/s] 14.89 Catchment area [km²] 160 Hydrological confidence interval Low SHER s.a. in association with Mhylab Site visit report – December 2016 Page 242 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Vambanungwi (SF-296) - 6. Representative pictures Figure 2 : General view of the site Figure 3 : General view of the riverflow Figure 4 : Dam site view Figure 5 : Powerhouse site view SHER s.a. in association with Mhylab Site visit report – December 2016 Page 243 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Wami (SF-143) - 78 WAMI (SF-143) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 38.377 - 6.241 Powerhouse 38.382 - 6.244 1. Administrative and socio-economic data Site code SF-143 Site name Wami River Wami Village Mandera (North) Region Pwani Basin Wami, Ruvu and Central Indian Ocean Coast Topographical map reference Topographical map n° 167/2 (scale 1/50,000) 2. Reference study Study name : Field visit Author : SHER Edition year : 2014 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] - 168.80 Gross head [m] - 8 Installed capacity [kW] - 11,210 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 244 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Wami (SF-143) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the main grid Scheme description : This site is located at Wami area about 2kms western of Wami Bridge along Arusha-Dar main road and Wami-Chalinze water supply Station. The river has huge volume and is very wide. They are only very small falls in the river. Exact location for the facilities need to be carefull studied in the future. Implementation of this site at the identified location will require direct pipe with no canal due to the nature of the terrain. Canal length [m] 659 Tunnel length [m] 0 Penstock length [m] 17 x 47 Dam type Concrete dam Dam height [m] 4 Dam width [m] 40 Measured turbidity [NTU] 100 Comments on solid transport No sand deposites Desilting basin size A medium sand trap is required Surge tank No surge tank is foreseen Penstock diameter [m] 3.5 (5 penstock(s)) Transmission line length [km] 2.0 Total road length to create [km] 2.0 Total road length to upgrade [km] 2.0 Potential impact of the scheme Very minimal environmental impacts Comments on accessibility The distances are calculated from the closest road, which is Dar-Arusha main road Other comments The site is located very close to national grid about 2 kilometers from the proposed power house location. The power can easily be connected to the National grid. The closest village is located about 6 kilometers from the site. Canal at left side of the river No future infractructure is foreseen in the coming years. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 8 Firm discharge [m³/s] 12.49 Firm capacity [kW] 829 Firm energy [GWh/yr] 7.26 Operating discharge [m³/s] 25.70 168.80 Installed capacity [kW] 1,700 11,210 Annual production [GWh/yr] 14.35 87.10 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 245 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Wami (SF-143) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 12.49 Q90% discharge [m³/s] 25.65 Q50% discharge [m³/s] 168.75 Q30% discharge [m³/s] 293.11 Design flood P100 yr [m³/s] 2557.52 Catchment area [km²] 39,982 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Chaliwasa gauging station at the bridge Figure 3 : Intake location Figure 4 : Powerhouse location SHER s.a. in association with Mhylab Site visit report – December 2016 Page 246 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mandera’s Waterfalls (M-245) - IV. 7 ADDITIONAL PROMISING POTENTIAL SMALL HYDROPOWER SITES 79 MANDERA’S WATERFALLS (M-245) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 38.331 -5.153 Powerhouse 38.339 -5.149 1. Administrative and socio-economic data Site code M-245 Site name Mandera’s Waterfalls River Pangani Village Mandera (close to Korogwe) Region Tanga Basin Pangani river basin Topographical map reference Topographical map n° 129/2 (scale 1/50,000) 2. Reference study Study name : Identification of potential pico, mini and micro hydroelectric sites in the Tanga region of Tanzania, IREP Author : IED Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 10.0 23.03 Gross head [m] 35 45 Installed capacity [kW] 2,580 8,390 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 247 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mandera’s Waterfalls (M-245) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : Run of the river scheme, located in the vicinity of a medium waterfall, designed with a small concrete weir on a unpopulated site. Canal, penstock and powerhouse are located on the right riverbank. Canal length [m] 1,050 Tunnel length [m] - Penstock length [m] 1 x 170 Dam type Concrete dam Dam height [m] 4 Dam width [m] 95 Measured turbidity [NTU] 200 Comments on solid transport Important Desilting basin size Large sand trap is required Surge tank No surge tank is foreseen Penstock diameter Q95 [m] 1.4 (1 penstock) Penstock diameter Q50 [m] 1.6 (3 penstocks) Transmission line length [km] 2.0 Total road length to create [km] 0.7 Total road length to upgrade [km] 1.0 Potential impact of the scheme There are two intakes for irrigation purposes located in the River stretch capted by the hydropower scheme. A part of the water must be left in the River for the irrigation. Comments on accessibility The access to the site is easy. Other comments The left side of the dam location is very flat. To avoid extra construction costs, the dam must be designed to let the water flows in the plain located on the left bank during high flood (return period >25 years). The intake site is located close to an Island which should simplify the construction of the dam with the possibility to easily divert the water. The intake and desilting basin must be carefully design. We recommend that the feasibility study includes a solid transport study. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 45 Firm discharge [m³/s] 5.38 Firm capacity [kW] 1,934 Firm energy [GWh/yr] 15.25 Operating discharge [m³/s] 5.4 23 Installed capacity [kW] 1,934 8,390 Annual production [GWh/yr] 15 60 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 248 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mandera’s Waterfalls (M-245) - 5. Hydrological data A flow duration curve is given in the IED’s prefeasibility study of this site but cannot be used. Indeed, the catchment area of the site used to the statistical analysis is twice as small as the actual area (checked with topographical data and satellite imagery). Consequently, a flow duration curve was recalculated. These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 5.38 Q90% discharge [m³/s] 8.04 Q50% discharge [m³/s] 23.03 Q30% discharge [m³/s] 31.35 Design flood [m³/s] 128.84 Catchment area [km²] 44,928 Hydrological confidence interval Low 6. Representative pictures Figure 2 : View of the principal falls Figure 3 : Pangani river close to the dam site Figure 4 : Pangani River at the tailrace canal location Figure 5 : Old powerhouse close to the new powerhouse site SHER s.a. in association with Mhylab Site visit report – December 2016 Page 249 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Umba (M-239) - 80 UMBA (M-239) Figure 1 : Site layout Geographic coordinates (WGS 84) Easting [°] Northing [°] Dam 38.346 -4.573 Powerhouse 38.373 -4.532 1. Administrative and socio-economic data Site code M-239 Site name Umba River Umba River Village Mlalo Region Tanga Basin Umba river basin Topographical map reference Topographical map n° 109/2 (scale 1/50,000) 2. Reference study Study name : Identification of potential pico, mini and micro hydroelectric sites in the Tanga region of Tanzania, IREP Author : IED Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 0.3 0.33 Gross head [m] 150 820 Installed capacity [kW] 320 2,054 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 250 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Umba (M-239) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : Run of the river scheme, located in the vicinity of a high head waterfall, designed with a small concrete weir on a stable bedrock. Canal, penstock and powerhouse are located on the right riverbank. Canal length [m] 4,860 Tunnel length [m] - Penstock length [m] 1 x 3,100 Dam type Masonery dam Dam height [m] 2 Dam width [m] 40 Measured turbidity [NTU] 50 Comments on solid transport low Desilting basin size Small sand trap is required Surge tank No surge tank is foreseen Penstock diameter Q95 [m] 0.2 (1 penstock) Penstock diameter Q50 [m] 0.4 (1 penstock) Transmission line length [km] 3.8 Total road length to create [km] 0.8 Total road length to upgrade [km] 0 Potential impact of the scheme There are no observed impact of the scheme. Comments on accessibility The access to the site is easy both for the powerhouse and the weir. Other comments The weir and intake will be at Mlalo wher the drop starts. The penstock contruction might be uneasy. The feasibility study must carefully locate the weir elevation in order to localize the canal under the existing road. There is a risk of very low flow (or no flow) during dry season because of the upstream irrigation levy. The intake and desilting basin must be carefully design. We recommend that the feasibility study includes a solid transport study. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 820 Firm discharge [m³/s] 0.08 Firm capacity [kW] 431 Firm energy [GWh/yr] 3.40 Operating discharge [m³/s] 0.08 0.33 Installed capacity [kW] 431 2,054 Annual production [GWh/yr] 3.4 14.71 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 251 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Umba (M-239) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.08 Q90% discharge [m³/s] 0.12 Q50% discharge [m³/s] 0.33 Q30% discharge [m³/s] 0.45 Design flood [m³/s] 1.77 Catchment area [km²] 127 Hydrological confidence interval Low 6. Representative pictures Figure 2 : View of the intake site Figure 3 : Grid at Magnalo Figure 4 : View on the Umba valley Figure 5 : Powerhouse site and downstream irrigation SHER s.a. in association with Mhylab Site visit report – December 2016 Page 252 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mkombola (M-222) - 81 MKOMBOLA (M-222) Figure 1 : Site layout Geographic coordinates (WGS 84) Latitude [°] Longitude [°] Dam -6.497 36.850 Powerhouse -6.507 36.834 1. Administrative and socio-economic data Site code M-222 Site name Mkombola River Mkombola Village Mpwampwa Region Morogoro Basin Wami river basin Topographical map reference 164-4 Rubeho 1/50,000 2. Reference study Study name : IREP (Integrated Rural Electrification Planning in Tanzania) Author : Innovation Energie Développement Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.65 1.24 Gross head [m] 160 160 Installed capacity [kW] 2,000 1,503 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 253 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mkombola (M-222) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : The existing study proposes to connect the Mpwampwa village with the proposed hydropower scheme. However, given the limited demand for power and energy in the village and the potential of the proposed hydropower scheme, it appears more relevant to connect it to the main grid. The layout recommended in the context of this study is similar to the one proposed in the existing study. The intake would be positioned slightly upstream compared to originally foreseen in the existing study. Also, given the steep slopes on both banks of the river (the right bank being slightly gentler), it is recommended that the waterway from the intake starts directly with a penstock to continue down to the powerhouse. Canal length [m] 0 Tunnel length [m] 0 Penstock length [m] 2,685 Dam type Masonery Dam height [m] 3 Dam width [m] 25 Comments on solid transport Although the low population density, parts of the watershed seem to be exposed to erosion given the hilly areas where the cultivation takes place, especially near the river. At the scheme site, a homemade canal was observed to irrigate some fields along the river. The water itself is not clear, even though at the time visit, the water level was historically low according to local people (October 2016, el nino effects were systematically reported during this mission). Heavy solid transport is suspected during rainy season. Desilting basin size Large Surge tank - Penstock diameter Q95 [m] 0.4 (1 penstock) Penstock diameter Q50 [m] 0.8 (1 penstock) Transmission line length [km] 50 Total road length to create [km] 7.5 Total road length to upgrade [km] 15 Potential impact of the scheme No major impact has been noticed at this stage, as long as the ecological issues are being dealt with (fish ladder, ecological flow during dry season). Comments on accessibility Access is quiet difficult due to the long distance between Mwpampwa and the main road (Mbeya – Dar Es Salaam), and the distance between Mpwampwa and the site. Morever, we need to walk more than 4km to reach the site and the intake site is located in a narrow and hilly valley. Other comments 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 160 Firm discharge [m³/s] 0.24 Firm capacity [kW] 276 Firm energy [GWh/yr] 2.17 Operating discharge [m³/s] 0.24 1.24 Installed capacity [kW] 276 1,503 Annual production [GWh/yr] 2.17 10.53 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 254 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mkombola (M-222) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.24 Q90% discharge [m³/s] 0.37 Q50% discharge [m³/s] 1.24 Q30% discharge [m³/s] 1.76 Design flood [m³/s] 8.82 Catchment area [km²] 229 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Upstream area of the site Figure 3 : Near weir site Figure 4 : Near the powerhouse site Figure 5 : The valley, taken the steam upwards SHER s.a. in association with Mhylab Site visit report – December 2016 Page 255 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mlowa (M-232) - 82 MLOWA (M-232) Figure 1 : Site layout Geographic coordinates (WGS 84) Latitude [°] Longitude [°] Dam -7.650 36.144 Powerhouse -7.665 36.167 1. Administrative and socio-economic data Site code M-232 Site name Mlowa River Mlowa Village Ilula Region Iringa Basin Great Ruaha river basin Topographical map reference 216-1 Ilula 1/50,000 2. Reference study Study name : IREP (Integrated Rural Electrification Planning in Tanzania) Author : Innovation Energie Développement Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.55 2.94 Gross head [m] 260 270 Installed capacity [kW] 3,000 6,323 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 256 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mlowa (M-232) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : The existing study proposes to connect the Ilula village with the proposed hydropower scheme. However, given the limited demand for power and energy in the village and the potential of the proposed hydropower scheme, it appears more relevant to connect it to the main grid. It worth mentioning that the river was dry at the time of visit (October 2016). A detailed hydrological study should be carried out to better understand the hydrological behavior of the river and hence the reasons why the river was dry (El- Niño climatic event, upstream water abstractions). Without such a detailed hydrological study that would confirm the availability of water throughout the year, this site is not recommended for hydropower development. The following technical description is therefore given for indicative purpose only should a detailed hydrological study confirms the favorable availability of water resources. The layout recommended in the context of this study differs from the one originally presented in the existing study: Instead of using a penstock from the intake to the powerhouse, a canal to the forebay is recommended. One of the main challenge will be to deal with the TanZam road which lies along the canal for over 600m, and eventually crosses the penstock. Another site, the SF-083 is located just downstream of the M-232 Canal length [m] 3,000 Tunnel length [m] 0 Penstock length [m] 895 Dam type Masonery Dam height [m] 3 Dam width [m] 30 Comments on solid transport The river was dry at the time of visit, but it is suspected that solid transport is significant given the agriculture activities on steep slopes along the river upstream of the site. Desilting basin size Large Surge tank - Penstock diameter Q95 [m] 0.6 (1 penstock) Penstock diameter Q50 [m] 1.0 (1 penstock) Transmission line length [km] 16 Total road length to create [km] 1 Total road length to upgrade [km] 0 Potential impact of the scheme Moderate. Hydrological issues are already being reported (see above). Comments on accessibility The accessibility is excellent. The site crosses the major road. Other comments 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 270 Firm discharge [m³/s] 0.71 Firm capacity [kW] 1,500 Firm energy [GWh/yr] 11.83 Operating discharge [m³/s] 0.71 2.94 Installed capacity [kW] 1,500 6,323 Annual production [GWh/yr] 11.83 45.27 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 257 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mlowa (M-232) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.71 Q90% discharge [m³/s] 1.05 Q50% discharge [m³/s] 2.94 Q30% discharge [m³/s] 3.97 Design flood [m³/s] 15.78 Catchment area [km²] 696 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Around the intake site. The river was dry at the time of Figure 3 : Global view of downstream area of site visit. Dealing with the road will be a major challenge. Figure 4 : On the right handside of the road is the canal area near Figure 5 : The Kitonga Gorge (in the middle of the site) the intake. SHER s.a. in association with Mhylab Site visit report – December 2016 Page 258 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mulawi (M-230) - 83 MULAWI (M-230) Figure 1 : Site layout Geographic coordinates (WGS 84) Latitude [°] Longitude [°] Dam -7.697 36.314 Powerhouse -7.679 36.317 1. Administrative and socio-economic data Site code M-230 Site name Mulawi River Mulawi Village Mahenge Region Iringa Basin Great Ruaha river basin Topographical map reference 216-2 Mtandika 1/50,000 2. Reference study Study name : IREP (Integrated Rural Electrification Planning in Tanzania) Author : Innovation Energie Développement Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 0.7 1.22 Gross head [m] 361 340 Installed capacity [kW] 1,892 3,245 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 259 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mulawi (M-230) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : The existing study proposes to connect the Mahenge village with the proposed hydropower scheme. However, given the limited demand for power and energy in the village and the potential of the proposed hydropower scheme, it appears more relevant to connect it to the main grid. The intake would be positioned upstream of a little gorge at the beginning of the waterfall. The intake would there be founded on hard rock. It will divert the water directly to the tunnel. Given the steep slopes on both sides of the river, we considered a tunnel to bypass the cliffs. However, an alternative layout featuring a canal/penstock could be considered if the design flow is low enough. The powerhouse would be located at the bottom of the cliffs. Canal length [m] 0 Tunnel length [m] 1,750 Penstock length [m] 1,125 Dam type Masonery Dam height [m] 2 Dam width [m] 15 Comments on solid transport Although agricultural activities are scarce upstream of the site, and population density low, bush fires appear to occur regularly, exposing the soils to erosion. The water was not quite clear, despite the low flow (very low due to el nino effect and the dry season, October 2016) Desilting basin size Large Surge tank - Penstock diameter Q95 [m] 0.4 (1 penstock) Penstock diameter Q50 [m] 0.8 (1 penstock) Transmission line length [km] 8 Total road length to create [km] 8.7 Total road length to upgrade [km] 6 Potential impact of the scheme No major impact has been noticed at this stage, as long as the ecological issues are later verified and considered (fish ladder, ecological flow during dry season). Comments on accessibility The accessibility is good, the site being located 6km away from the main Tanzam road. Other comments 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 340 Firm discharge [m³/s] 0.30 Firm capacity [kW] 710 Firm energy [GWh/yr] 5.60 Operating discharge [m³/s] 0.30 1.22 Installed capacity [kW] 710 3,245 Annual production [GWh/yr] 5.60 23.22 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 260 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mulawi (M-230) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.30 Q90% discharge [m³/s] 0.44 Q50% discharge [m³/s] 1.22 Q30% discharge [m³/s] 1.65 Design flood [m³/s] 6.54 Catchment area [km²] 215 Hydrological confidence interval Low 6. Representative pictures Figure 2 : The intake position would be located upstream of this Figure 3 : The tunnel allows to bypass the steep slopes of the gorge. area. Figure 4 : Overview of the site, taken from below. Figure 5 : River, downstream of powerhouse site. SHER s.a. in association with Mhylab Site visit report – December 2016 Page 261 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgugwe (M-228) - 84 MGUGWE (M-228) Figure 1 : Site layout (The satellite images reflect the site better) Geographic coordinates (WGS 84) Latitude [°] Longitude [°] Dam -8.675 35.825 Powerhouse -8.676 35.825 1. Administrative and socio-economic data Site code M-228 Site name Mgugwe River Mgugwe Village Lugoda Region Morogoro Basin Rufiji river basin Topographical map reference 249-2 Chita 1/50,000 2. Reference study Study name : IREP (Integrated Rural Electrification Planning in Tanzania) Author : Innovation Energie Développement Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 5.97 1.07 Gross head [m] 25 7 Installed capacity [kW] 1,186 59 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 262 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgugwe (M-228) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : The existing study proposes to connect the village with the proposed hydropower scheme. However, given the limited demand for power and energy in the village and the potential of the proposed hydropower scheme, it appears more relevant to connect it to the main grid. The site visit revealed that the actual head available was approximately 7m, compared to the 20m mentioned in the existing study. The proposed layout consists of a canal-penstock configuration on the right bank of the river. Canal length [m] 60 Tunnel length [m] 0 Penstock length [m] 17 Dam type Masonery Dam height [m] 2 Dam width [m] 15 Comments on solid transport Although agricultural activities are scarce upstream of the site, and population density low, some areas in the watershed appear to be exposed to erosion (visible soils from satellite images). The water was clear at the moment of visit, and given the head (around 7m) of the site, impacts on wears should be reduced with some precaution on desilting basin and flow control during floods. Desilting basin size Small Surge tank - Penstock diameter Q95 [m] 0.4 (1 penstock) Penstock diameter Q50 [m] 0.6 (1 penstock) Transmission line length [km] 4 Total road length to create [km] 3.6 Total road length to upgrade [km] 0 Potential impact of the scheme No major impact has been noticed at this stage, as long as the ecological issues are verified and considered (fish ladder, ecological flow during dry season). Comments on accessibility Although quite far from the main Tanzam, the site has a good accessibility, benefiting from the tarmac road of the Kihanzi hydropower plant. Other comments 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 7 Firm discharge [m³/s] 0.29 Firm capacity [kW] 16 Firm energy [GWh/yr] 0.12 Operating discharge [m³/s] 0.29 1.07 Installed capacity [kW] 16 59 Annual production [GWh/yr] 0.12 0.42 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 263 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mgugwe (M-228) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.29 Q90% discharge [m³/s] 0.42 Q50% discharge [m³/s] 1.07 Q30% discharge [m³/s] 1.41 Design flood [m³/s] 5.00 Catchment area [km²] 200.88 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Main waterfall, taken from the top Figure 3 : Weir site Figure 4 : Main waterfall, taken from the bottom Figure 5 : Upstream of the weir position SHER s.a. in association with Mhylab Site visit report – December 2016 Page 264 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfisigo (M-211) - 85 MFISIGO (M-211) Figure 1 : Site layout Geographic coordinates (WGS 84) Latitude [°] Longitude [°] Dam -7.088 37.686 Powerhouse -7.071 37.706 1. Administrative and socio-economic data Site code M-211 Site name Mfisigo River Mfisigo Village Tawa Region Morogoro Basin Ruvu river basin Topographical map reference 201-1 Mgeta 1/50,000 2. Reference study Study name : IREP (Integrated Rural Electrification Planning in Tanzania) Author : Innovation Energie Développement Edition year : 2012 Reference study Hydropower Atlas Recommendation Operating discharge [m³/s] 1.15 0.29 Gross head [m] 160 250 Installed capacity [kW] 1,400 537 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 265 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfisigo (M-211) - 3. Technical data Type of scheme foreseen: Run of the river Type of connection: Connected to the grid Scheme description : The existing study proposes to connect the Tawa village with the proposed hydropower scheme. However, given the limited demand for power and energy in the village and the potential of the proposed hydropower scheme, it appears more relevant to connect it to the main grid. Compared to the existing study, the scheme considered here would maximize the available head. It is not considered that a second intake on the Mfisigo tributary would be a major added value due to its relatively low flow as compared to the additional works and costs required. The proposed scheme would feature a 2.5km long canal that would carry the water to a 250m long tunnel followed by a 710m long penstock. Canal length [m] 2,500 Tunnel length [m] 250 Penstock length [m] 755 Dam type Masonery Dam height [m] 2 Dam width [m] 25 Comments on solid transport Sediment transport is an issue given the fact that a significant part of the watershed is densely cultivated on steep slopes. Desilting basin size Large Surge tank - Penstock diameter Q95 [m] 0.2 (1 penstock) Penstock diameter Q50 [m] 0.4 (1 penstock) Transmission line length [km] 12 Total road length to create [km] 4 Total road length to upgrade [km] 21 Potential impact of the scheme No major impact has been noticed at this stage, as long as the ecological issues are being dealt with (fish ladder, ecological flow during dry season). Comments on accessibility Accessibility is an issue. Once we leave Morogoro, the road becomes quite rough. At the time of visit, road works were being conducted on the road. The road becomes worse once we take the rural road towards Tawa. Other comments An automated flow measuring gauge has been found on the site, but no relevant information was available from the local people. 4. Energy production and costs data Off-grid Connected grid (mini-grid/national grid) Gross head [m] 250 Firm discharge [m³/s] 0.03 Firm capacity [kW] 43 Firm energy [GWh/yr] 0.34 Operating discharge [m³/s] 0.03 0.29 Installed capacity [kW] 43 537 Annual production [GWh/yr] 0.34 3.61 SHER s.a. in association with Mhylab Site visit report – December 2016 Page 266 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfisigo (M-211) - 5. Hydrological data These parameters were defined by regionalization. These preliminary values are only indicative. They might in no case be used for detailed design. Firm discharge Q95% [m³/s] 0.03 Q90% discharge [m³/s] 0.06 Q50% discharge [m³/s] 0.29 Q30% discharge [m³/s] 0.46 Design flood [m³/s] 3.79 Catchment area [km²] 43 Hydrological confidence interval Low 6. Representative pictures Figure 2 : Site overview Figure 3 : Near the weir site Figure 4 : River configuration Figure 5 : Bridge on the main river SHER s.a. in association with Mhylab Site visit report – December 2016 Page 267 of 268 Small Hydro Tanzania REA / The World Bank Contract n°7169139 - Mfisigo (M-211) - SHER s.a. in association with Mhylab Site visit report – December 2016 Page 268 of 268