A unit of volume equal (of course) to 1/12 acre foot. An acre inch contains exactly 3630 cubic feet, about 27 154.29 U.S.gallons, or about 102.7902 cubic meters
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}