Understanding Acre-Feet to US Pecks Conversion
An acre-foot is the volume covering one acre one foot deep, the standard unit in US water storage and irrigation planning. The US peck is a dry-volume unit of about 8.810 liters, equal to a quarter of a bushel or eight dry quarts, traditionally used for apples and other produce. Converting acre-feet to pecks expresses large water volumes in this classic dry-measure scale.
Conversion Formula
To convert Acre-Feet to US Pecks, multiply by this factor:
Step-by-Step Example
Convert 25 Acre-Feet to US Pecks.
How to Convert Acre-Feet to US Pecks
Express reservoir-scale water volumes in traditional US pecks with one multiplication.
- Start with acre-feet: Note your value, for example 25 acre-feet.
- Multiply by 140013: The number of US pecks in one acre-foot.
- Report the result: 25 × 140013 = 3,500,325 US pecks.
- Verify: Multiply pecks by 0.000007142195 to convert back to acre-feet.
Acre-Feet to US Pecks conversion table
| Acre-Feet (acre-foot) | US Pecks (pk) |
|---|---|
| 0 | 0 |
| 1 | 140013 |
| 2 | 280026 |
| 3 | 420039 |
| 4 | 560051.9 |
| 5 | 700064.9 |
| 6 | 840077.9 |
| 7 | 980090.9 |
| 8 | 1120104 |
| 9 | 1260117 |
| 10 | 1400130 |
| 15 | 2100195 |
| 20 | 2800260 |
| 25 | 3500325 |
| 30 | 4200390 |
| 40 | 5600519 |
| 50 | 7000649 |
| 60 | 8400779 |
| 70 | 9800909 |
| 80 | 11201040 |
| 90 | 12601170 |
| 100 | 14001300 |
| 150 | 21001950 |
| 200 | 28002600 |
| 250 | 35003250 |
| 300 | 42003900 |
| 400 | 56005190 |
| 500 | 70006490 |
| 600 | 84007790 |
| 700 | 98009090 |
| 800 | 112010400 |
| 900 | 126011700 |
| 1000 | 140013000 |
| 2000 | 280026000 |
| 3000 | 420039000 |
| 4000 | 560051900 |
| 5000 | 700064900 |
| 10000 | 1400130000 |
| 25000 | 3500325000 |
| 50000 | 7000649000 |
| 100000 | 14001300000 |
| 250000 | 35003250000 |
| 500000 | 70006490000 |
| 1000000 | 140013000000 |
What is the Acre-Foot?
The acre-foot is a unit of volume equal to the amount of water needed to cover one acre of land to a depth of one foot. It is the standard measure used for large-scale water resources in the United States, including reservoirs, irrigation supplies, and municipal water rights.
Definition
One acre-foot is defined as the volume of a prism with a base area of one acre (43,560 square feet) and a height of one foot, giving exactly 43,560 cubic feet.
Because the US survey foot and the international foot differ slightly, the acre-foot is fixed by its exact defining relation of 43,560 cubic feet, which equals about 1,233.48 cubic metres or 1,233,482 litres.
Origin and History
The acre-foot arose in the American West during the late 19th and early 20th centuries, as irrigation districts and water agencies needed a practical unit for measuring large volumes of stored and delivered water. It combines the acre, an old English unit of land area, with the foot of depth, making it intuitive for engineers estimating how much water a given area of reservoir or flooded field holds.
Law and Notable Facts
The acre-foot remains the legal and administrative unit for water rights, reservoir capacity, and interstate water compacts throughout the western United States. A commonly cited rule of thumb is that one acre-foot supplies roughly one to two typical American households for a year, which is why it is used to describe how many homes a reservoir can serve.
Real-World Examples and Conversions
- A single acre-foot equals about 325,851 US gallons of water.
- Lake Mead, the largest reservoir in the US, has a capacity of roughly 28.9 million acre-feet when full.
- An Olympic swimming pool holds about 2,500 cubic metres, or roughly 2 acre-feet.
- In metric terms, 1 acre-foot is approximately 1,233 cubic metres (1.23348 million litres).
What is the US Peck?
The US peck is a United States customary unit of dry volume, equal to a quarter of a bushel, used for measuring fruit, vegetables, and grain. It sits between the dry gallon and the bushel in the dry-measure system.
Definition
The US peck is defined as one quarter of a US bushel, or 8 US dry quarts, equal to exactly 537.605 cubic inches.
With the bushel fixed at 2150.42 in³, a peck equals 2150.42 ÷ 4 = 537.605 in³ = 8809.77 cm³. The US peck is about 3% smaller than the imperial peck (9.09218 L).
Origin and History
The peck is an old English dry measure, attested since the 14th century and long used for grain and produce. Its US form is tied to the Winchester bushel retained from colonial England, while the imperial peck follows Britain's 1824 reform.
Law and Notable Facts
The peck endures in the tongue-twister "Peter Piper picked a peck of pickled peppers" and in US orchard sales, where apples are still sold by the peck and half-peck. It remains a legal customary unit defined via the international inch.
Real-World Examples and Conversions
- A peck of apples weighs roughly 10–12 lb and fills about 8.81 liters.
- 1 US peck = 8 US dry quarts = 16 US dry pints = 8.80977 L.
- 4 US pecks make 1 US bushel; 1 liter ≈ 0.11351 US peck.
Frequently Asked Questions
How many US pecks are in an acre-foot?
One acre-foot equals 140013 US pecks, since a peck is about 8.810 liters and an acre-foot is roughly 1,233,000 liters.
How do I convert acre-feet to US pecks?
Multiply acre-feet by 140013. For example, 3 acre-feet equals 3 × 140013 = 420,039 US pecks.
How do I convert US pecks back to acre-feet?
Multiply the pecks by 0.000007142195. So 500,000 pecks is about 3.571 acre-feet.
How does a peck relate to a bushel?
A US peck is one-quarter of a US bushel, so the acre-foot-to-peck count is exactly four times the acre-foot-to-bushel count.
What was the peck traditionally used for?
The peck is an old dry measure long used for fruits and vegetables, such as a peck of apples, making it a familiar produce-scale unit.