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One twelfth of an acre-foot, equal to 3,630 cubic feet.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Units) the volume of water that would cover an area of 1 acre to a depth of 1 inch; one twelfth of an acre-foot: equivalent to 3630 cubic feet or 102.8 cubic metres
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


one-twelfth of an acre-foot.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
One acre-inch of water equals 27,154 gallons - per week!
Vigil gets farmers' attention when he tells them that storing water in just the top inch of an acre of land--an "acre-inch"--is worth $25 to $30 an acre.
An acre-inch of water contains 43,560 [ft.sub.2] (4046.7 [m.sup.2]) / 12 in per ft= 3,630 cu ft.
In the agricultural areas of the western states, water is measured and sold by the acre-inch. There are approximately 25,000 gallons in an acre-inch.
That's about 1 pound of powder per acre-inch of water.
Using an accepted figure of 25,000 gallons per acre-inch, some 60,000 gallons of water per acre fell on our property from this past storm.
Production year water use gradually decreased from 80 acre-inches per acre in 1969 to 36 acre-inches by 1996 as drip irrigation became the standard.