- Retention basin
A retention basin is used to manage stormwater runoff to prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay. Sometimes called a wet pond or wet detention basin, it is an artificial lake with vegetation around the perimeter, and includes a permanent pool of water in its design. 
It is distinguished from a detention basin, sometimes called a dry pond, which temporarily stores water after a storm, but eventually empties out at a controlled rate to a downstream water body. It also differs from an infiltration basin which is designed to direct stormwater to groundwater through permeable soils.
Wet ponds are frequently used for water quality improvement, groundwater recharge, flood protection, aesthetic improvement or any combination of these. Sometimes they act as a replacement for the natural absorption of a forest or other natural process that was lost when an area is developed. As such, these structures are designed to blend into neighborhoods and viewed as an amenity.
Storm water is typically channeled to a retention basin through a system of street and/or parking lot storm drains, and a network of drain channels or underground pipes. The basins are designed to allow relatively large flows of water to enter, but discharges to receiving waters are limited by outlet structures that function only during very large storm events.
Retention ponds are often landscaped with a variety of grasses, shrubs and/or wetland plants to provide bank stability and aesthetic benefits. Vegetation also provides water quality benefits by removing soluble nutrients through uptake. In some areas the ponds can attract nuisance types of wildlife like ducks or Canada Geese, particularly where there is minimal landscaping and grasses are mowed. This reduces the ability of foxes, coyotes and other predators to approach their prey unseen. Such predators tend to hide in the cattails and other tall, thick grass surrounding natural water features.
- Nationwide Urban Runoff Program (NURP) – US stormwater research project
- Settling basin – for treating agricultural & industrial wastewater
- Stream restoration
- Sustainable urban drainage systems
- Urban runoff
- Water pollution
- Sustainable Flood Retention Basin
- Balancing lake (UK)
A retention basin can also be a part of a nuclear reactor used to contain a core meltdown.
- ^ Water Environment Federation, Alexandria, VA; and American Society of Civil Engineers, Reston, VA. "Urban Runoff Quality Management." WEF Manual of Practice No. 23; ASCE Manual and Report on Engineering Practice No. 87. 1998. ISBN 1-57278-039-8. Chapter 5.
- ^ U.S. Environmental Protection Agency. Washington, D.C. "Preliminary Data Summary of Urban Storm Water Best Management Practices." Chapter 5. August 1999. Document No. EPA-821-R-99-012.
- ^ Mississippi State University. College of Engineering. Stormwater Retention Basins. Chapter 4, Best Management Practices.
- ^ Urban Drainage & Flood Control District, Denver, CO. Urban Storm Drainage Criteria Manual. Volume 3, Structural BMPs.
- Virginia retention basin standards
- Detention vs. retention – Harris County, Texas Flood Control District
- Stormwater Ecological Enhancement Project – University of Florida
- The use of retention ponds in residential settings
- International Stormwater BMP Database – Performance Data on Urban Stormwater BMPs
Stormwater structures Containment Flow control Infiltration
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Look at other dictionaries:
retention basin — noun a storage site similar to a detention basin but the water in storage is permanently obstructed from flowing downstream • Hypernyms: ↑river basin, ↑basin, ↑watershed, ↑drainage basin, ↑catchment area, ↑catchment basin, ↑drainage area … Useful english dictionary
retention basin — a wetland or excavated basin constructed to contain excess rain or runoff, especially in urban developments where water cannot be easily absorbed into the ground. Some drain quickly and support no fish life, others have a permanent central area… … Dictionary of ichthyology
retention pond — retention basin … Dictionary of ichthyology
Retention — can have the following meanings:*Retention basin, instance retaining (e.g. water in the ground) *In learning: it is the ability to retain facts and figures in memory (spaced repetition) *Grade retention, in schools, keeping a student in the same… … Wikipedia
Detention basin — A detention basin is a stormwater management facility installed on, or adjacent to, tributaries of rivers, streams, lakes or bays that is designed to protect against flooding and, in some cases, downstream erosion by storing water for a limited… … Wikipedia
drainage basin — noun the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet flood control in the Missouri basin • Syn: ↑river basin, ↑basin, ↑watershed, ↑catchment area,… … Useful english dictionary
river basin — noun the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet flood control in the Missouri basin • Syn: ↑basin, ↑watershed, ↑drainage basin, ↑catchment area,… … Useful english dictionary
Settling basin — Settling pond under construction, Blue Ribbon Mine, Alaska A settling basin, settling pond or decant pond are devices used to treat turbidity in industrial wastewater. The basins are used to control water pollution in diverse industries such as… … Wikipedia
Sediment basin — A sediment basin is a temporary pond built on a construction site to capture eroded or disturbed soil that is washed off during rain storms, and protect the water quality of a nearby stream, river, lake, or bay. The sediment laden soil settles in … Wikipedia
catchment basin — noun the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet flood control in the Missouri basin • Syn: ↑river basin, ↑basin, ↑watershed, ↑drainage basin,… … Useful english dictionary