: the volume (as of irrigation water) that would cover one acre to a depth of one foot

Examples of acre-foot in a Sentence

Recent Examples on the Web
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Each acre-foot represents about 326,000 gallons and is roughly enough to supply three households for a year. Brandon Loomis, AZCentral.com, 3 Feb. 2026 The reservoir, located more than 10 miles west of the small town of Maxwell in Colusa County and crossing the Glenn County line, would store up to 1.5 million acre-feet of water for water agencies throughout the state. Jake Goodrick, Sacbee.com, 24 Jan. 2026 The federal Bureau of Reclamation, which serves farmers in the Central Valley, would get 39,000 acre-feet of the new water. Paul Rogers, Mercury News, 23 Jan. 2026 An acre-foot of water is roughly 326,000 gallons, enough to serve about three families for a year. City News Service, Daily News, 22 Jan. 2026 See All Example Sentences for acre-foot

Word History

First Known Use

1889, in the meaning defined above

Time Traveler
The first known use of acre-foot was in 1889

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Cite this Entry

“Acre-foot.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acre-foot. Accessed 15 Feb. 2026.

Kids Definition

acre-foot

noun
: the volume (as of irrigation water) that would cover one acre to a depth of one foot

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