Key:water_tank:volume
 water_tank:volume
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| Description |
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Volume of a water reserve in an emergency water tank. 
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| Group: properties |
| Used on these elements |
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| Useful combination |
| See also |
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| Status: in use |
| Tools for this tag |
This key has been introduced to specify the volume of a water reserve in an emergency water tank.
How to use
Add water_tank:volume=* to an existing emergency=water_tank and specify the volume. Default unit for volume is m3 but there are lots of existing entries in l (litres). It is therefore recommended to specify the unit explicitly by adding the appropriate symbol l or m3 to avoid any misunderstanding.
The use of this key is controversial, as there is the much more widely used generic capacity=*, which can also be applied to emergency water tanks. Consider using this generic key instead of water_tank:volume=*.
See also
capacity=* A very generic tag used for various kinds of objects, including all kinds of storage tanks.
water_volume=* a newer but less used key being a duplicate of water_tank:volume=*. Use is not recommended.
External link
https://community.openstreetmap.org/t/deprecate-water-volume-in-favour-of-water-tank-volume/141117.