acre-inch
LowTechnical
Definition
Meaning
A unit of volume used primarily in irrigation and water resource management, representing the volume of water needed to cover one acre of land to a depth of one inch.
Equivalent to 102.790 cubic meters or approximately 27,154 gallons of water. Used to quantify water flows, reservoir storage, and agricultural water application.
Linguistics
Semantic Notes
It is a compound noun, treated as a single unit of measurement. It is a non-SI unit with very specific application. The term is often used in plural form ('acre-inches').
Dialectal Variation
British vs American Usage
Differences
The unit is used in both regions in agricultural and hydrological contexts, but the imperial acre (4840 sq yd) is standard in UK and US customary acre (43560 sq ft) is standard in the US, though they are nearly identical. The term is equally technical in both.
Connotations
Technical precision, agricultural planning, water resource management, and irrigation efficiency.
Frequency
Extremely rare in general language. Exclusive to professional fields of hydrology, agriculture, civil engineering, and environmental science in both the UK and US.
Vocabulary
Collocations
Grammar
Valency Patterns
[Number] acre-inch(es) of [water/rain/irrigation]deliver/provide/apply [number] acre-inchesVocabulary
Synonyms
Neutral
Usage
Context Usage
Business
Used in contracts for water allocation, farming operations, and resource management reports.
Academic
Found in hydrology, agricultural science, environmental engineering, and water resource management papers.
Everyday
Virtually never used in everyday conversation.
Technical
The primary context. Precise calculations for irrigation scheduling, canal flow rates, and reservoir storage.
Examples
By CEFR Level
- The farm needs several acre-inches of water each week.
- The irrigation system delivered fifteen acre-inches to the corn field last month.
- The water rights agreement stipulates an annual allocation not exceeding two hundred acre-inches from the reservoir.
Learning
Memory Aids
Mnemonic
Think of a football field (about an acre) covered with a one-inch deep layer of water.
Conceptual Metaphor
WATER IS A LAYER (covering land). VOLUME IS DEPTH OVER AREA.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'акр-дюйм' as it is a specific unit. Use the descriptive phrase 'объём воды, необходимый для покрытия одного акра земли слоем в один дюйм' or the approximate metric equivalent (102.8 куб. м).
Common Mistakes
- Using it as a measure of area (it is volume).
- Confusing it with 'acre-foot' (which is 12 times larger).
- Hyphenating inconsistently (standard is 'acre-inch').
Practice
Quiz
What does one acre-inch represent?
FAQ
Frequently Asked Questions
No, it is a unit of volume in the US Customary and British Imperial systems used for water volume.
One acre-inch is approximately 27,154 US gallons.
It is primarily used in the United States and other countries with historical ties to British Imperial units for irrigation, hydrology, and water resource management.
An acre-foot is twelve times larger than an acre-inch (1 acre-foot = 12 acre-inches). An acre-foot covers one acre to a depth of one foot.