This note reviews the significance of geological complications in hydroelectric projects and proposes guidelines for reducing their occurrence. It surveys 64 Bank-financed hydro projects and reveals that over 35 percent of them have experienced unexpected geological difficulties resulting in average civil works cost overruns of over 65 percent, with tunneling the main component of civil works affected. The paper also reveals that civil works cost...
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Geological complications and cost overruns : a survey of Bank-financed hydroelectric projects (English). Energy Department note|no. 61 Washington, DC: World Bank. http://documents.worldbank.org/curated/en/173901468175733212