Hoover hydroelectric dam, Colorado River, USA

Hydroelectric dam. The dam of a hydroelectricpower station. Electricity generated by hydro-electric stations is relatively cheap & has littleimpact on the environment other than on the riverit is built on. The amount of hydroelectric powergenerated may be increased quickly simply byraising the flood gates. Hydroelectric power stat-ions are commonly used during peak demand times.Photograph of the Hoover Dam on the ColoradoRiver, USA. Built during 1931-36, this dam is 221metres high and 379 metres wide at its crest. Thereservoir behind it, Lake Mead, has an area of 694square kilometres. The dam's turbines are capableof generating 1.5 million kilowatts of power.. Stunning Photo Gifts From Science Photo Library

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