: 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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In comparison, growing a single acre of alfalfa consumes as much as 6 acre-feet of water each year, according to University of Arizona's College of Agriculture and Life Sciences. Trevor Hughes, USA Today, 15 Mar. 2026 One 2009 estimate showed that removing the hundreds of thousands of these interlopers in the lower Colorado basin could bring 1 million acre-feet of water back to the watershed. Shi En Kim, AZCentral.com, 13 Mar. 2026 The Kern Fan Project, which would store only up to 100,000 acre-feet of water, is not scheduled to even receive a hearing for its funding until 2028 and would not be operational until 2031. Daniel Kolkey, Oc Register, 9 Mar. 2026 The lowest inflow on record occurred in 2002, when less than 1 million acre-feet made its way to the reservoir. Elise Schmelzer, Denver Post, 9 Mar. 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 19 Mar. 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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