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artificial lakes Aswan High Dam benefit of dams Berwick dam bottomlands build dams Buttress dams clay or concrete cofferdams Concrete arch dams concrete gravity dam control water controversial create dam allowed Dam became dam begins Dam builders Dam was built dam's foundation Dams are named dry riverbed earth-fill dam ecosystem Edwards Dam Egypt Embankment dams Engineers falling water feed a river fish to migrate Folsom Grand Coulee grist Hoover Dam huge hydroelectric dams hydroelectric power irrigation Itaipu Dam Johnstown Flood Kariba Dam largest dams largest hydroelectric migrating fish mile 1.6 km Modern dams move Nile River penstocks poured powerhouse produces electricity re-route the river reservoir water level riprap rock scouring galleries snowmelt South Fork Dam spillway gate stands 700 feet Steel rods structures studies the Earth Tarbela Three Gorges Dam tunnel turbines upstream vertical support water power water pressure water's force watertight world's largest Yangtze River