Detention
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Detention aims at slowing down the rate of flow of surface runoff. The basic facility is a basin or storage reservoir with an outlet that temporarily stores storm runoff. Storage reservoirs, which delay the passage of water during storm events, reduce the peak flow rate and therefore decrease the risk of downstream flooding and erosion. Nevertheless, the total volume of flow is still allowed to run downstream, stretched out over time. Detention is a quantitative modification of conveyance. On its own it is inherently unable to address water quality, groundwater replenishment or water supplies. When water is stored in properly designed ponds and wetlands, suspended particles can settle out and the rainwater can be "treated". This is commonly called extended detention.
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