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|basin = detention|
|A detention basin catches storm water and allows it to drain slowly into natural waterways.|
|Rendering in openstreetmap-carto|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
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.
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"