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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 aquatic plants to provide bank stability and aesthetic benefits.
The retention basin represents a dry basin or green basin and predominantly comprises forested areas. Under normal conditions, during low and moderate water levels, the river’s water is allowed to flow unhindered through a culvert in the dam, which has a cross-section measuring 3.80 m × 2.70 m with an inlet restriction of 1.40 m × 0.95 m).
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]
Retention treatment basins or large concrete tanks that store and treat combined sewage are another solution. These underground structures can range in storage and treatment capacity from 2 million US gallons (7,600 m 3) to 120 million US gallons (450,000 m 3) of combined sewage. While each facility is unique, a typical facility operation is as ...
This basin type differs from a retention basin, also known as a "wet pond," which includes a permanent pool of water. [ 7 ] [ 8 ] [ 9 ] While basic detention ponds are typically designed to empty within 6 to 12 hours after a storm, extended detention (ED) dry basins improve the basic detention design by lengthening the storage time, for example ...
The first rain gardens were created to mimic the natural water retention areas that developed before urbanization occurred. The rain gardens for residential use were developed in 1990 in Prince George's County, Maryland, when Dick Brinker, a developer building a new housing subdivision had the idea to replace the traditional best management practices (BMP) pond with a bioretention area.
The Kinzua Dam in Pennsylvania, with outlet works releasing water. A gatehouse, gate house, outlet works or valve house for a dam is a structure housing sluice gates, valves, or pumps (in which case it is more accurately called a pumping station). Many gatehouses are strictly utilitarian, but especially in the nineteenth century, some were very ...
Percolation Trench. A percolation trench, also called an infiltration trench, is a type of best management practice (BMP) that is used to manage stormwater runoff, prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay.