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What is "acre-foot"

Wiktionary
acre-foot

n. A unit of volume equal to an acre times a foot, about 1233.5 kiloliters, or 66 feet by 660 feet by 1 foot.

WordNet
acre-foot

  1. n. the volume of water that would cover 1 acre to a depth of 1 foot; 43,560 cubic feet or 1233.5 cubic meters

  2. [also: acre-feet (pl)]

Wikipedia
Acre-foot

The 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, sewer flow capacity, irrigation water, and river flows.

Usage examples of "acre-foot".

I'd guess anywhere from ten to fifteen million acre-feet of water a year is flowing down there.

Water pulled by gravity and pushed by the increasing weight of each season’s rain sinking down until the aquifer became a solid river under tremendous pressure, millions upon millions of acre-feet of pure cold liquid waiting to pour out once the waterproof stratum over it was broken by a drill bit.

After they have bought the water rights then they must pay for every acre-foot they use.