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One acre-foot is 325,851.4 US gallons of water.
One acre-foot is about 325,851 US gallons.
An acre foot is a unit of liquid measure equal to the amount of water used to cover one acre to the depth of one foot, that is, 43,560 cubic feet.
One acre-foot is 1,233.5 cubic meters.
An acre is a unit of area. A foot is a unit of distance. The two units are therefore incompatible.