Acre-foot
Also called: AF
The volume of water covering one acre to a depth of one foot — 325,851 gallons, and the standard unit for storage and annual supply.
An acre-foot is the currency of western water. Reservoir capacity, annual allocations, municipal supply and transaction pricing are all quoted in acre-feet or acre-feet per year.
As a rough anchor, an acre-foot is often described as enough for two to three average households for a year, though efficiency and climate make that a loose comparison. For agriculture, irrigation demand commonly runs two to five acre-feet per acre per season depending on crop and region.
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