acre-foot acre-foot /ˈeɪkər fʊt/

noun

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