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<br />Page 49 <br /> <br />003150 <br />circumstances, nearly half of the increased flows would be utilized to alleviate <br /> <br />shortage throughout the entire Colorado River Basin. It is noteworthy that <br /> <br />under full development conditions, the removal of institutional constraints <br /> <br />causes the utilization rate of increased flows to rise from 20 percent to 48 <br /> <br />percent. <br /> <br />Table V-l. Disposition of Increased Flows Due to Vegetation Manipulation <br />(Thousands of Acre Feet Annually) <br /> <br /> With Existing Interstate Water Allocation Institutions <br /> Alleviation of Alleviation of <br />Demand Lower Basin Upper Basin <br />Conditions Evaporation Storage Outflow Shortages Shortages <br /> i <br />Current 10 2 64 6 0 ~ <br />Full <br />development 20 20 24 16 0 <br /> Without Existing Interstate Water Allocation Institutions <br /> Alleviation of Alleviation of ~ <br />Demand Lower Basin Upper Basin <br />Conditions Evaporation Storage Outflow Shortages Shortages <br />Current 21 2 58 0 0 <br />Full <br />development 19 0 25 16 22 <br /> <br />The Colorado River Basin is characterized by substantial annual variation <br /> <br />in precipitation and runoff, and doubtless by substantial longer term variation <br /> <br />as well. This variation can be expected to cause variability in the potential <br /> <br />additional runoff produced by vegetation manipulation, as discussed in the <br /> <br />preceding section, and also in total runoff throughout the basin. Ideally, one <br /> <br />would use available data on historic runoff in the basin as a sample from which <br /> <br />to infer possible future runoff patterns and then investigate the implications <br /> <br />for the uses of augmented flows of selected potential runoff patterns. Such a <br />