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Public-images-osm logo.svg basin = retention
Trounce Pond.jpg
A retention basin catches stormwater and retains it, forming an artificial pond. Show/edit corresponding data item.
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 retention basin is an artificial pond with vegetation around the perimeter, and includes a permanent pool of water in its design. It is used to manage stormwater runoff to prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay.

The basin is normally filled with water.

How to map

Draw as an area area along the outline of the basin and add


See also

  • basin=detention - detention basin catches storm water and allows it to drain slowly into natural waterways.
  • basin=infiltration - infiltration basin catches storm water and allows it to seep into an aquifer.