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Description of South Platte River Basin <br />• Native flows for total basin estimated to be 1,400,000 <br />acre - feet annually by the USGS <br />• Transmountain water provides approximately another <br />400,000 acre - feet per year <br />• Total annual surface water diversions equal <br />approximately 4,000,000 acre - feet <br />• Approximately 9,000 decreed high capacity wells in <br />South Platte River basin and its tributaries on record. <br />Less in actual existence. <br />• Ground water pumping from high capacity alluvial wells <br />located along the South Platte River are estimated to be <br />over 500,000 acre - feet annually <br />• Approximately 1 million irrigated acres <br />• Population grew from 250,000 to approximately <br />2,500,000. <br />8 <br />