What is Acre-foot?

The acre-foot is a non-SI unit of volume equal to about 1,233 m 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.

An acre-foot equals approximately an eight-lane swimming pool, 82 ft long, 52 ft wide and 9.8 ft deep.