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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. 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. 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. The stored water then can be used for irrigation, livestock, municipal water supply, recreation, and hydroelectric power generation. Diversion dams are used to raise the water level in order to redirect the water to the designated location. The diverted water can be used for supplying irrigation systems or reservoirs.==Purposes==Detention dams are constructed for multiple purposes including: flood control, flow rate restriction, subsurface water replenishment, and sediment trapping. Detention dams are used in flood prone areas for flood control. A detention dam is built at an elevation above the flood prone zone. Flood water is collected in the basin above the dam and released at a flow rate the flood zone and channel can accommodate. Channels can include dikes, canals, streams, drain pipes, and rivers. The basin above a flood detention dam should remain at the lowest water level in order to prevent overtopping. Overtopping is when the water level behind the dam exceeds the dam crest height. The dam crest is the top edge of the dam. Overtopping is caused by extreme flooding or severe waves. The severe waves can be a result of high winds, landslides, and earthquakes. The detention dam design must take into account the probability of overtopping occurring and be designed accordingly. Detention dams built to restrict flow rate regulate the amount water released into channels. Detentions dams used to replenishment the subsurface water or groundwater hold surface runoff to allow the ground to absorb the water. Groundwater is water that has drained into an aquifer due to the force of gravity. An aquifer is layers of permeable soils and rocks below the earth's surface that allow water to accumulated between the rocks and soils. Debris dams are a type of detention dam used to collect sediment to prevent it from flowing into areas where large sediment buildup may be damaging.
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. 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.〔 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. The stored water then can be used for irrigation, livestock, municipal water supply, recreation, and hydroelectric power generation. Diversion dams are used to raise the water level in order to redirect the water to the designated location. The diverted water can be used for supplying irrigation systems or reservoirs.〔
==Purposes==
Detention dams are constructed for multiple purposes including: flood control, flow rate restriction, subsurface water replenishment, and sediment trapping.〔 Detention dams are used in flood prone areas for flood control. A detention dam is built at an elevation above the flood prone zone. Flood water is collected in the basin above the dam and released at a flow rate the flood zone and channel can accommodate. Channels can include dikes, canals, streams, drain pipes, and rivers. The basin above a flood detention dam should remain at the lowest water level in order to prevent overtopping.〔 Overtopping is when the water level behind the dam exceeds the dam crest height. The dam crest is the top edge of the dam. Overtopping is caused by extreme flooding or severe waves. The severe waves can be a result of high winds, landslides, and earthquakes.〔 The detention dam design must take into account the probability of overtopping occurring and be designed accordingly. Detention dams built to restrict flow rate regulate the amount water released into channels.〔 Detentions dams used to replenishment the subsurface water or groundwater hold surface runoff to allow the ground to absorb the water.〔 Groundwater is water that has drained into an aquifer due to the force of gravity. An aquifer is layers of permeable soils and rocks below the earth's surface that allow water to accumulated between the rocks and soils. Debris dams are a type of detention dam used to collect sediment to prevent it from flowing into areas where large sediment buildup may be damaging.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「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. 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. 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. The stored water then can be used for irrigation, livestock, municipal water supply, recreation, and hydroelectric power generation. Diversion dams are used to raise the water level in order to redirect the water to the designated location. The diverted water can be used for supplying irrigation systems or reservoirs.==Purposes==Detention dams are constructed for multiple purposes including: flood control, flow rate restriction, subsurface water replenishment, and sediment trapping. Detention dams are used in flood prone areas for flood control. A detention dam is built at an elevation above the flood prone zone. Flood water is collected in the basin above the dam and released at a flow rate the flood zone and channel can accommodate. Channels can include dikes, canals, streams, drain pipes, and rivers. The basin above a flood detention dam should remain at the lowest water level in order to prevent overtopping. Overtopping is when the water level behind the dam exceeds the dam crest height. The dam crest is the top edge of the dam. Overtopping is caused by extreme flooding or severe waves. The severe waves can be a result of high winds, landslides, and earthquakes. The detention dam design must take into account the probability of overtopping occurring and be designed accordingly. Detention dams built to restrict flow rate regulate the amount water released into channels. Detentions dams used to replenishment the subsurface water or groundwater hold surface runoff to allow the ground to absorb the water. Groundwater is water that has drained into an aquifer due to the force of gravity. An aquifer is layers of permeable soils and rocks below the earth's surface that allow water to accumulated between the rocks and soils. Debris dams are a type of detention dam used to collect sediment to prevent it from flowing into areas where large sediment buildup may be damaging.」の詳細全文を読む
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