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A detention dam is a dam built to catch surface runoff and stream water flow in order to regulate the water flow in areas below the dam .. dam. dam. surface runoff. surface runoff. water. water. Detention dams are commonly used to reduce the damage caused by flooding or to manage the flow rate through a channel .. Detention dams can also be constructed to replenish groundwater and trap sediment .. groundwater. groundwater. sediment. sediment. Detention dams are one of three classifications of dams which include  : storage dams , diversion dams , and detention dams .. Storage dams are used to store water for extended lengths of time .. water. water. The stored water then can be used for irrigation , livestock , municipal water supply , recreation , and hydroelectric power generation .. water. water. irrigation. irrigation. livestock. livestock. hydroelectric power. hydroelectric power. Diversion dams are used to raise the water level in order to redirect the water to the designated location .. water. water. The diverted water can be used for supplying irrigation systems or reservoirs .. water. water. irrigation. irrigation. reservoirs. reservoirs