Key:water_tank:volume

water_tank:volume
Description
Volume of the water reserve, applicable only to water tanks.
Group: water management
Used on these elements
Useful combination
emergency=fire_hydrant emergency=water_tank
See also
water_volume=*
Status: de facto
water_tank:volume=* More details at taginfo More details at taginfo
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Undocumented Tag
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Used to provide the available volume of water in combination with emergency=water_tank.

Note: There is a newer and approved but (for now) less used key water_volume=*.