The USGS Water Science School[an error occurred while processing this directive]
If you've looked out of an airplane window while flying over the central or western United States, chances are you saw lot of the "little" circles on the ground. They are center-pivot irrigation circles. In these systems, water is pumped from a well in the center of the circle from an underground aquifer and distributed through a giant pipe hundreds of yards long; the whole systems pivots around a central point. In the past, large spray guns were used to shoot water through the air onto the crops, but nowadays more efficient low-pressure sprinklers hang from the pipes to spray water close to the ground, which is a much more efficient method that saves water.
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