Balancing lake
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A balancing lake is a term used in the U.K. describing a retention basin used to control flooding by temporarily storing flood waters. The term balancing pond is also used, though typically for smaller storage facilities for streams and brooks.
Priorslee Lake in Shropshire, England. Originally known locally as the Balancing Lake, it was created to manage water run-off from the roofs and streets of Priorslee.
Willen Lake (north basin), with spill-way in the background
Retention basin
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A retention basin, sometimes called a retention pond, wet detention basin, or storm water management pond (SWMP), is an artificial pond with vegetation around the perimeter and a permanent pool of water in its design. It is used to manage stormwater runoff, for protection against flooding, for erosion control, and to serve as an artificial wetland and improve the water quality in adjacent bodies of water.
Trounce Pond, a retention basin landscaped with natural grassland plants, in Saskatoon, Saskatchewan, Canada
The Corporate Park retention basin in Stafford, Texas, United States
A Retention pond guarded by concrete wall and surrounded by Taro plants in an Semi-urban indian Town
Retention basin in Pinnau, Schleswig-Holstein, Germany