Tag:basin=detention
 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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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."
If built along mountain streams, they are also called debris basins and designed to hold a significant amount of debris in case of torrential mudflows, while letting water drain off.
How to map
Draw as an area along the outline of the basin and add
or
Gallery
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Detention basin -
Detention basin -
Debris basin -
Debris basin
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.