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<br />Table 2 shows a summary of the results for the ~oject areas. The analyses show <br />the average precipitation increase during the seeding pernd ranging from 14 to 20 percent <br />and the April 1 average snow water content increase ranging from 7 to 20 percent. For the <br />project areas in the northern part of the state, the average precipitation increases are about <br />the same as the April 1 average snow water content increases. In the Central/Southern <br />Utah project area, the average April 1 snow water content is one-half of the average <br />precipitation increase. The reason for the difference may be due to earlier snowmelt in the <br />southern part of the state compared to the control areas. <br /> <br /> Table 2. <br />SUMMARY OF CLOUD SEEDING PROJECT AREAS <br /> Number of Cloud Precipitation April 1 Snow <br /> Seeding Generators Seeded Increase During Water Content <br />Project Area 1999-2000 Season Years Seeding Period Increase <br />Centrall50uthern Utah 66 22 14% 7% <br />Tooele County 9 15 19% 20% <br />East Box Elder/Cache County 22 11 20% 18% <br />West Box Elder County 12 9 NfA 18% <br /> <br />Annual Runoff Estimated from Apri/1 Snow Water Content <br /> <br />Regression equations relating annual runoff to April 1 snow water content were <br />derived for the major gaged rivers and streams in the cloud seeding project areas. The <br />equations were used to estimate the percent increase in annual runoff (water years) that <br />would occur for a 10 percent increase in the April 1 snow water content. The gaged <br />streamftow stations, correlated SNOTEUsnow course station(s), regression equatnn <br />correlation coefficient, and the percent annual runoff increase for a 10 percent increase in <br />April 1 snow water content are shown in Table 3. As expected. a 10 percent increase in <br />the April 1 snow water content results in a greater than 10 percent increase in annual <br /> <br />-6- <br />