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Detention (Dry) and retention (Wet) basins are a storm water Best Management Practice (BMP) designed to reduce the impacts of pollutants and increased storm water on local streams caused by development.
Retention ponds are stormwater basins that include a permanent pool for water quality treatment and additional capacity above the permanent pool for temporary storage. A dry detention basin is an earthen structure that provides temporary storage of runoff and functions hydraulically to attenuate stormwater runoff peaks.
The basins are designed to control runoff peak flow rates of discharge for the 1 year through the 100 year events.