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<br />ORA F T <br /> <br />Augmentation for the total region, including water-short areas <br />outside the Colorado River Basin, is an important consideration in <br />enhancing regional and state water supply. <br /> <br />~ <br /> <br />Estimated Benefits and Costs <br /> <br />The 1952-1971 period for the NAWC study was selected primarily <br />on the availability of radiosonde and snow course data. The computed <br />annual virgin flow or undepleted of the Upper Basin during this <br />period averaged 13,014,000 acre-feet, which is less than the average <br />of 13,614,000 acre-feet during the last 35 years (1942-1976). Table 3 <br />shows the estimated augmentation potential by years during this <br />period as compared to the computed virgin flow. The average augmenta- <br />tion potential in this period is 1,315,000 acre-feet, a 10.1-percent <br />increase in computed virgin flow and a 13.2-percent increase in <br />reported Lake Powell inflow. <br /> <br />17 <br />