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As a rule of thumb in US water management, one acre-foot is taken to be the planned annual water usage of a suburban family household. [b] In some areas of the desert Southwest, where water conservation is followed and often enforced, a typical family uses only about 0.25 acre-foot per year (310 m 3 /a) of water per year. [4]
The list is divided in two: all lakes as conventionally defined down to 3,000 square kilometres (1,200 sq mi), and the largest lakes under a geological definition, where the Caspian Sea is considered a small ocean rather than a lake, and Lake Michigan–Huron (or "Huron–Michigan") is recognized as a single body of water.
This article lists lakes with a water volume of more than 100 km 3, ranked by volume. The volume of a lake is a difficult quantity to measure. [1] Generally, the volume must be inferred from bathymetric data by integration. Lake volumes can also change dramatically over time and during the year, especially for salt lakes in arid climates.
This list includes all islands in the world larger than 1,000 km 2 (390 sq mi). For size and location reference, the four continental landmasses are also shown. Continental landmasses Continental landmasses are not usually classified as islands despite being completely surrounded by water. [Note 1] However, because the definition of continent varies between geographers, the Americas are ...
The following is a list of the fourteen reservoirs, in the United States state of Wyoming, that contain at least 40,000 acre-feet (49 million cubic meters) when at full capacity. In addition to in-stream reservoirs, the list includes enhanced natural lakes , notably Jackson Lake .
Traditional British usage assigned new names for each power of one million (the long scale): 1,000,000 = 1 million; 1,000,000 2 = 1 billion; 1,000,000 3 = 1 trillion; and so on. It was adapted from French usage, and is similar to the system that was documented or invented by Chuquet.
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An acre was the amount of land tillable by one man behind one team of eight oxen in one day. Traditional acres were long and narrow due to the difficulty in turning the plough and the value of river front access. An oxgang was the amount of land tillable by one ox in a ploughing season. This could vary from village to village, but was typically ...