Acre-feet (acre-foot)

An expression of water quantity. One acre-foot will cover one acre of ground 1 ft deep. An acre-foot contains 43,560 ft3 - 1,233 m3 - or 325,829 gal (U.S.). Also abbreviated as ac-ft.


Source: Handbook of water and wastewater treatment plant operations

Wikipedia: https://en.wikipedia.org/wiki/Acre-foot