Acre-foot

An acre-foot (plural: acre-feet ) is a volume unit of measurement used in the United States. It is preferably used for large-scale water tanks, aqueducts, canals and reservoirs and is also used for measurement of groundwater abstraction and water use in agriculture.

The acre-foot is defined by the volume which is necessary in order to flood an area of ​​1 acre to a depth of 1 foot (feet) with water. An acre is exactly 43,560 ft ² ( square feet ) large. Thus, an acre-foot has a volume of exactly 43,560 ft ³ ( cubic feet ).

The special feature is that you can usually at a volume measure a cube with three equal edge lengths expected. That would be the acre-foot is a cube with an edge length of about 35 feet (or more precisely, the number 35.1854 ). In the metric system, which is a cube with an edge length of about 10.72 meters.

According to the U.S. definition but it is a cuboid with three different edge lengths:

1 furlong × 1 × 1 foot chain = 660 ft × 66 ft × 1 ft (or 1 × 1 acre foot)

Conversions

1 acre- foot = 43,560 cubic foot = 75.27168 million cubic inch cubic meter = 1233.48183754752

3 acre-feet = 4840 cubic yard

7 acre-feet = 2.28096 million U.S. gallon

168 133 acre-feet = 45,619,200,000 54,786,378,240 U.S. gallon = Imp.gallon

1 acre-foot ≈ ≈ 325 851 271 328 Imp.gallon gallon U.S.

Example of use

In the hot New Mexico water is scarce. The water rights are regulated by public authorities. A fountain has, for example, an approved water quota of 0.7 acre-foot per year. These are 863 m³ per year or 2.3 m³ per day. The average water consumption of a German household is ( for comparison) 100 m³ / year.

As a rule of thumb, expect the U.S. water authorities with an annual water consumption of an acre-foot for a family of four. In many historic water - management contracts is expected to be unity acre-foot/Jahr. For example, the waters of the Colorado River is divided with a contract between seven U.S. states - is 15 million acre-feet/Jahr. The river sometimes causes less water.

  • Anglo American unit
  • Unit volume
28031
de