A stormwater detention system during installation beneath a parking lot
A stormwater detention vault is an underground structure designed to manage excess stormwater runoff on a developed site, often in an urban setting. This type of best management practice may be selected when there is insufficient space on the site to infiltrate the runoff or build a surface facility such as a detention basin or retention basin.[1]
Detention vaults manage stormwater quantity flowing to nearby surface waters. They help prevent flooding and can reduce erosion in rivers and streams. They do not provide treatment to improve water quality,[2] though some are attached to a media filter bank to remove pollutants.
^"Stormwater Best Management Practices in an Ultra-Urban Setting: Selection and Monitoring". Fact Sheet – Detention Tanks and Vaults. Washington, D.C.: United States Department of Transportation. Federal Highway Administration. May 2002.
^"Georgia Stormwater Management Manual. Section 3.4.3: Underground Detention" (PDF). Atlanta, GA: Atlanta Regional Commission. August 2001.
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