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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