Tag:basin=detention
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 basin = detention
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A detention basin catches storm water and allows it to drain slowly into natural waterways. 
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Rendering in OSM Carto 
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| Group: Water management |
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| Status: de facto |
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A special basin used for detention of rainwater before being discharged into a surface water body. The basin is normally not filled with water. There should be an inflow and an outflow.
Detention basin on Wikipedia: "A detention basin is a storm water management facility ... that is designed to protect against flooding and, in some cases, downstream erosion by storing water for a limited period of a time. These basins are also called "dry ponds", "holding ponds" or "dry detention basins" if no permanent pool of water exists." The picture beside show a "dry pond"
How to map
Draw as an area along the outline of the basin and add
or
See also
- basin=infiltration - infiltration basin catches storm water and allows it to seep into an aquifer.
- basin=retention - retention basin catches storm water and retains it, forming an artificial pond.