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<br />Estimated Increased RunoIT and Cost per Acre-Foot <br /> <br />The percent increase in al1l1ual runolTfor a 10 percent increase in April 1M snow <br />water content was estimated for each streamtlow station. All of the streamtlow stations in <br />each project area were then volume \....eighted to determine the average percent increase in <br />annual runolT for a 10 percent increase in snow water content tor the entire project area. <br />See Appendix R for calculations. This weighted value was then multiplied by the actual <br />percent increase in April I SI snow water content detemlined from target and control <br />analysis and divided by 10 to obtain a runofTfactor. The runolTfactor \....as multiplied by <br />lhe average annual runoff for the project area to determine the increase in annual runoff <br />due to cloud seeding. The results are shown in Table 4. The estimated average annual <br />increase in runolTfor all of the projects combined is 222,965 acre-feet. This is about a 7 <br />percent increase overall. The increase in runolT for the Northern Utah Project is 63.661 <br />acre-feet. The Central/Southern Utah Project increase is 75.539 acre-feet. The Western <br />Uinta Mountain project increase is 13.240 and the High Uinta Mountain project increase <br />is 70.525. <br />The cost analysis results are shmvn in Table 5. The cost for the 2003-2004 cloud <br />seeding project is 5377,862. With the estimated increased runoff being 222.965 acre-feet. <br />the cost per acre-root equals 51.69. This cost will tluctuate year-to-year as a longer record <br />of data is collected. The April 1'1 snow water content reflects climate variations such as <br />drought therefore as more years of data are collected a better average can be determined. <br /> <br />7 <br />