Topic summary
Reservoir
A reservoir (; from Frenchréservoir) is an enlarged lake behind a dam, usually built to storefresh water, often doubling for hydroelectric power generation.
Reservoirs are created by controlling a watercourse that drains an existing body of water, interrupting a watercourse to form an embayment within it, excavating, or building any number of retaining walls or levees to enclose any area to store water.