
1) Irrigation unit 2) Unit of irrigation
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https://www.crosswordclues.com/clue/acre-foot

1) Unit of volume
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https://www.crosswordclues.com/clue/acre-foot

An acre-foot is a unit of volume commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, sewer flow capacity, irrigation water and river flows. ...
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http://en.wikipedia.org/wiki/Acre-foot

The volume of water required to cover one acre of land to a depth of one (1) foot. One acre-foot is equal to 325,851 gallons of water.
Found on
http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html

the volume of water, 43,560 cubic feet, that will cover an area of one acre to a depth of one foot; a term used in sewage treatment in measuring the volume of material in a trickling filter.
Found on
http://www.chemicalglossary.net/definition/3-Acre_foot

The volume of water that would cover one acre to a depth of one foot.
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http://www.encyclo.co.uk/local/20076

The volume of water needed to flood one acre of land to a depth of one foot. Equivalent to 43,560 cu
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http://www.encyclo.co.uk/local/22392

The volume of water that would cover one acre of land (43,560 square feet) to a depth of one foot, e
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http://www.encyclo.co.uk/local/22399

a unit of volume often used in oil reservoir analysis, equivalent to the volume (as of oil or water) necessary to cover 1 acre to a depth of 1 foot.
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http://www.encyclo.co.uk/visitor-contributions.php

the volume of water, 43,560 cubic feet, that will cover an area of one acre to a depth of one foot; a term used in sewage treatment in measuring the volume of material in a trickling filter.
Found on
http://www.hach.com/chemGlossary

[
n] - the volume of water that would cover 1 acre to a depth of 1 foot
Found on
http://www.webdictionary.co.uk/definition.php?query=acre-foot

A volume one foot deep covering an area of one acre. Used to measure the capacity of reservoirs.Conversions1 acre foot=43560 cubic feet1 acre foot=1233.482 m
31 acre foot=0.123 348 hectare metre1 acre foot=12 acre inchesttle='Acre Foot';xiunt='m
3';yiunt='acre foot';mconv=1233.482;cconv=0.0; See also: Acre, Acre Inch, Foot, Volu...
Found on
https://www.encyclo.co.uk/local/20687
noun the volume of water that would cover 1 acre to a depth of 1 foot; 43,560 cubic feet or 1233.5 cubic meters
Found on
https://www.encyclo.co.uk/local/20974

a unit of volume of water in irrigation: the amount covering one acre to a depth of one foot, equal to 43,560 cubic feet.
Found on
https://www.infoplease.com/dictionary/acre-foot
No exact match found.