A depression designed to hold stormwater for 24 - 72 hours in order to allow sediment and pollutants to settle before the water drains. According to Fairfax County, dryponds planted with wetland plants and that support wetlands species perform better than those planted with lawn grass.

extended detention basins, detention ponds, extended detention ponds

PERFORMANCE CRITERIA

Water quality of water exiting drypond.

ILLUSTRATION
a diagram or drawing that demonstrates the basic pattern or concept

CASE STUDIES
Mill Creek Canyon Earthworks Park, Kent

ADDITIONAL RESOURCES

Fairfax County Fact Sheet:http://www.fairfaxcounty.gov/dpwes/environmental/swm_quickref.htm

StormwaterCenter.net Fact Sheet:http://www.stormwatercenter.net/Assorted%20Fact%20Sheets/Tool6_Stormwater_Practices/Pond/Dry%20ED%20Pond.htm