The term "hydropower" is a common word used to generalize the many different means of utilizing the energy in flowing water, ranging from large hydroelectric power plants to systems that harness both tidal and wave power. Hydroelectric facilities provide approximately 25 percent of the world's electricity supply-with plants operating in 86 countries across the globe (Carless, Jennifer 1993). Hydroelectric dams produce electricity much more efficiently than other conventional sources (such as coal and nuclear) while also maintaining a …showed first 75 words of 2800 total…

…showed last 75 words of 2800 total…ve Energy." Butterworth-Heinemann Ltd. vol 19 n8, pp 768-775. 1991. Martin, Russell, A Story That Stands Like A Dam. Henry Holt and Company New York, 1989. Searls, Peter, Hoover Dam: A Case History in Engineering Design. Dept of Engineering,University of California- Los Angeles. Feb, 1964. Ritchie, Donald A., Building Hoover Dam: An Oral History of the Great Depression. Twayne Publishers. New York, 1993. United States Department of the Interior, Report on the Western Energy Expansion Study. Bureau of Reclamation, 1977.