Center pivot irrigation southern plains, Nebraska (1986)
	From the air, few scenes are so dramatic as the prevalence of center-pivot irrigation circles along the Great Plains. These fields, round because the irrigation sprinklers pivot about a central point, are by and large maintained with groundwater pumped from the pivot point, water that is contributing in many places to the overdraft of water taken from the ancient aquifers that underlie the Plains. The depletion of these waters is a crisis that has no easy answer.
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