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Public-images-osm logo.svg basin = detention
Dry pond.jpg
A detention basin catches storm water and allows it to drain slowly into natural waterways. Show/edit corresponding data item.
Rendering in OSM Carto area
Landuse basin empty 100.png
Group: water management
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)


Status: de facto

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 area along the outline of the basin and add


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.