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The Ogallala Aquifer (oh-gÉ™-LAH-lÉ™) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
Turpan is located in the second deepest geographical depression in the world, with over 4,000 km 2 (1,500 sq mi) of land below sea level and with soil that forms a sturdy basin. [3] Water naturally flows down from the nearby mountains during the rainy season in an underground current to the low depression basin under the desert.
A keyline irrigation channel in Orana, Australia. Keyline design is a landscaping technique of maximizing the beneficial use of the water resources of a tract of land. The "keyline" is a specific topographic feature related to the natural flow of water on the tract.
Windmill used to pump water for irrigation, Compton, ca. 1900–1901. Groundwater is a critical element of the California water supply. During a normal year, 30% of the state's water supply comes from groundwater (underground water). In times of intense drought, groundwater consumption can rise to 60% or more. [5]
The terraces were built to make the most efficient use of shallow soil and to enable irrigation of crops by allowing runoff to occur through the outlet. [9] The Inca people built on these, developing a system of canals, aqueducts, and puquios to direct water through dry land and increase fertility levels and growth. [10]
Diversion dams, pumping plants, and aqueducts provide municipal water supply as well as irrigation of about 100,000 acres (4,000,000 dam 2). [562] The Red Bluff Diversion Dam diverts part of the Sacramento River [563] into the 110-mile (180 km) Tehama-Colusa Canal, the 21-mile (34 km) Corning Canal and a small reservoir formed by Funks Dam. [564]
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