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Senin, 08 Oktober 2012

Pivot Irrigation, Colorado

A pivot irrigation system creates a distinctive pattern on farmland in Colorado’s San Luis Valley.
The high-altitude valley—sitting 7,000 feet (2,130 meters) above sea level—is arid but situated atop shallow groundwater sources that rise to form surface springs, lakes, and marshlands. Those waters, recharged by seasonal snowmelt from the surrounding mountains
, have been used to extensively irrigate crops in the area since the late 19th century.


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