Acre-Foot (AF) A unit commonly used for measuring the volume of water, equal to the quantity of water required to cover one acre (43,560 square feet or 4,047 square meters) to a depth of 1 foot (0.30 meter) and equal to 43,560 cubic feet (1,234 cubic meters), or 325,851 gallons.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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