Acre foot
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An acre foot is a unit of volume commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, and river flows. It is defined by the volume of water necessary to cover one acre of surface area to a depth of one foot. It is equal to exactly 43,560 cubic feet, or to nearly 325,851 U.S. gallons, or exactly 1233.48183754752 cubic meters. As a rule of thumb in U.S. water management, one acre foot is taken to be roughly the amount of water used annually by a family of four. The acre foot (or more specifically the time rate unit of acre foot per year) has been used historically in the U.S. in many water-management agreements, for example the Colorado River Compact, which divides 15 million acre feet per year (586 m³/s) among seven western U.S. states. Reservoir capacities in the U.S. are typically given in acre feet.
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