Detention ponds are basins that receive and hold runoff for release at a predetermined rate, thereby reducing the peak runoff delivered to storm sewers and streams. ... Detention ponds are designed to release all captured runoff over time, and do not allow for permanent pooling of water.

Do detention ponds hold water?

Detention ponds hold water for a short period of time; this pond temporarily holds water before it enters the stream. combination of these types of practices is needed to impact nonpoint source pollution.

How is detention pond calculated?

The equation for converting detention pond volume in mm over the watershed area, Vs, to m3, is: Vst = (10)(Vs)(A) m3. In S.I. units the runoff depth, Qb or Qa, can be calculated from known values for the peak runoff rate, time of concentration, and watershed area, with the equation: Q - 360(qp tc/A).