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The function of true retention basins is to provide storage of storm water runoff,
and release via evaporation and infiltration only. Those retention basins that provide
for a slow release of storm water over an extended period of several days or more
are referred to as extended detention facilities. Retention facilities may also be
used for recreation, pollutant removal, groundwater recharge, aesthetics, or even
water supply. Like detention basins, they can be above or below ground. Most facilities
are designed for both storm water impoundment and quality control.
Storm water retention with or without permanent wet pool will not be acceptable methods
of storm water mitigation unless the facility will remain privately owned, operated,
and maintained.
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