Acre-foot. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/acre-foot
A unit of volume equal to an acre times a foot, about 1233.5 kiloliters, or 66 feet by 660 feet by 1 foot.
(plural acre feet)
(US, engineering, agriculture) A unit of measure, used for volumes of water, equal to one acre times one foot (that is, to the amount of water required to cover one acre of land to a depth of one foot), which is 43,560 cubic feet, 325,851 gallons, 1,233 cubic meters.
English Wiktionary. Available under CC-BY-SA license.