It has been suggested that this article or section be merged with Retention basin. (Discuss) A Detention basin is an artificial flow control structure that is used to contain flood water. A detention basin provides protection for areas below it by containing flood water for a short period of time. This is opposed to a retention basin that holds water for an extended period of time. Wikipedia does not have an article with this exact name. ...
It has been suggested that this article or section be merged with Detention basin. ...
Look up Flood in Wiktionary, the free dictionary A flood (in Old English flod, a word common to Teutonic languages; compare German Flut, Dutch vloed from the same root as is seen in flow, float) is an overflow of water, an expanse of water submerging land, a deluge. ...
Water (from the Old English word wæter; c. ...
Instance of retaining (e. ...
In some areas, structures like these are used to assist in seperating the storm sewers from the sanitary waste sewers. In older cities, storm and sanitary waste were combined in one pipe. Many cities have sewage treatment facilities that are forced to flush untreated sewage into streams and rivers without treatment during heavy storms since they are not equiped to handle the larger flows. By providing a way to reduce these peak flows, it helps to reduce the frequency of releases of untreated sewage. A storm drain, storm sewer, or stormwater drain (in Australia) system is designed to drain excess rain and ground water from an area. ...
Sewage treatment is the process that removes the majority of the contaminants from waste-water or sewage and produces both a liquid effluent suitable for disposal to the natural environment and a sludge. ...
Capacity and size
These structures are designed to accommodate a specific amount of water, usually defined in terms of a 50 year flood or a 100 year flood, sometimes called a one-percent probability flood. If the flow exceeds this amount, there is a spillway which provides an outlet for the excess water. However release of water by this means usually will pose a threat to the areas the detention basin was installed to protect. Overflow can be into washes or streets depending on where the basin is located.
The size of these structures varies. However you will frequently see them in sizes of 10 to 50 acres (4,000 to 20,000 m²) and up to 50 feet (15 m) deep. The designed holding capacity of these structures is determined by the size of the area that drains into the structure and the maximum size of the flood the structure is designed to contain.
Design features The basins function by allowing large flows of water to enter, but limit the outflow by having a small opening at the lowest point of the structure. The size of this opening is determined by the underground and downstream culverts and washes capacity to handle the release of the contained water. Underground as an adjective commonly refers to something that is either below the ground or outside of public consciousness. ...
A culvert is a flowing body of water which passes underneath a road, railway, or embankment, or the part thereof that does so. ...
Frequently the inflow area is constructed to protect the structure from some types damage. Offset concrete blocks in the entrance spillways are used to reduce the speed of entering flood water. These structures may also have debris drop vaults to collect large rocks. These vaults are deep holes under the entrance to the structure. The holes are wide enough to allow large rocks and other debris to fall into the holes before they can damage the rest of the structure. These vaults must be emptied after each use. This article is about the construction material. ...
Uses when empty Since these structures do not see frequent use, especially in desert areas, they are frequently designed as dual use facilities.
The areas are designed as ball fields, dog parks or other large play areas. Since the fields can be under water, special care needs to be taken when lighting is installed to illuminate the playing fields. These areas also have minimal equipment to limit properity damage when in use during floods.
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