Tag:water=basin
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 water = basin
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| Description |
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An area of land artificially graded to hold water. 
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| Group: water management |
| Used on these elements |
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| See also |
| Status: de facto |
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An area of land artificially graded to hold water. Note that this definition includes also structures typically without water. Usually these features are made for man made water courses e.g. storm water, water treatment.
It is treated as synonymous to landuse=basin by many database users.
How to map
Draw as an area 
along the outline of the basin.
Add natural=water and water=basin
and the type of basin:
basin=infiltration- An
infiltration basin catches storm water and allows it to seep into an aquifer.basin=detention- Adetention basin catches storm water and allows it to drain slowly into natural waterways.basin=retention- Aretention basin catches storm water and retains it, forming an artificial pond.basin=evaporation- A basin used to evaporate water.basin=footbath- A basin containing water to clean the feet before entering a swimming pool.basin=water_regeneration- A basin with plants for the biological regeneration of water, e.g. at swimming pools.
Tags used in combination
name=<name of the basin>basin=*- refines the type of the basinintermittent=yes- If the presence of water is intermittent.
Possible tagging mistakes
Do not use this tag for land form (natural) basins e.g. the Amazon Basin. There are no tags (yet, 2018) in OSM for mapping such features.
See also
landuse=basin- Synonym fornatural=water+water=basinlanduse=salt_pond- A salt pond, salt evaporation pond or salternnatural=water+water=pond- A small body of standing water, man-made in most casesnatural=water+water=reservoir- An artificial lake which may be used to store water. Usually formed by a dam over a natural water course.natural=water+water=lock- A device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterwaysnatural=water+water=wastewater- A clarifier or settling basin of a wastewater treatment plantnatural=water- Any inland body of water, from natural such as a lake or pond to artificial like a moat or canalwater=*- Specification of a water bodyleisure=swimming_pool- A man-made swimming poolamenity=kneipp_water_cure- A foot bath is a shallow pool, often with handrail.