Stormwater detention vault
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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; they help prevent flooding and can reduce downstream erosion. They do not provide treatment to improve water quality.[2]
[edit] Design and Installation
Underground stormwater detention allows for high volume storage of runoff in a small footprint area. The storage vessels can be made from a variety of materials, including corrugated metal pipe, aluminum, steel, plastic, fiberglass, pre-cast or poured-in-place concrete.[3]
The vault is typically buried under a parking lot or other open land on the site. In the latter case this underground vault may be preferable to a surface detention pond if other uses are intended for the land (e.g. a pedestrian plaza or park). In other situations a vault is used because installing a pond might pose other problems, such as attracting unwanted waterfowl or other animals. In some sites a vault may be installed in the basement of a building, such as a parking garage.[4]
[edit] See also
[edit] References
- ^ United States Department of Transportation. Federal Highway Administration. Washington, DC."Stormwater Best Management Practices in an Ultra-Urban Setting: Selection and Monitoring."Fact Sheet – Detention Tanks and Vaults. May 2002.
- ^ Atlanta Regional Commission. Atlanta, GA. "Georgia Stormwater Management Manual." Section 3.4.3: "Underground Detention." August 2001.
- ^ City of Duluth, Minnesota. "Tools for Stormwater Management: Underground Storage." Accessed April 15, 2008.
- ^ United States Environmental Protection Agency. Washington, DC. "Storm Water Technology Fact Sheet: On-Site Underground Retention/Detention." September 2001. Document No. EPA-832-F-01-005.
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