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<br />o <br />(' ...~ ") <br />N <br />en <br />..J <br />e.n <br /> <br />Three primary target areas and two supplementary areas have been identified <br /> <br />for evaluation. The primary target areas labeled Central, South Central, and Dixie, <br /> <br />respectively, lie within the high yield portion of the mountain watersheds extending <br /> <br />from near Nephi in the north to Saint George in the south. The supplementary areas <br /> <br />lie outside the main target and have been included in an effort to determine the <br /> <br />extent of seeding effects beyond the target. <br /> <br />Stations within the "target areas" consist of both low elevation precipitation <br /> <br />gages (primarily valley sites) and high elevation (above 8000 ft MSL) storage gage <br /> <br />sites. The low elevation target and the control stations are shown on Attachment 1 <br /> <br />(by number) and the high elevation target sites are indicated on Attachment 2 <br /> <br />(by letter). (The station names and locations are included in the appendix of the <br /> <br />NAWC study). <br /> <br />SUMMARY OF RESULTS: <br /> <br />Results of the NAWC analysis indicated an average 18.6% increase in seasonal <br /> <br />precipitation in the overall target area using the months of January, February and <br /> <br />March as the Winter Season. The indicated increases in precip ranged from a low <br /> <br />of 12.5% in the Central target to a high of 32.9% in the Dixie area. The Statistical <br /> <br />Significance associated with these percentages of increase were extremely good. <br /> <br />DIVISION OF WATER RESOURCES RESPONSIBILITY' <br /> <br />The NAWC Report could be looked at as self-serving and lacking in credibility <br /> <br />because the private contractor was evaluating it's own work. Therefore, the Division <br /> <br />of Water Resources independently carried out the entire process of evaluation. The <br /> <br />only duplication was the Division's use of the NAWC designation of target and control <br /> <br />areas. The Division's results, althou~l not identical to NAWC, were sufficiently <br /> <br />close so as to not negate the basic conclusion that the process of cloudseeding to <br /> <br />increase precipitation is effective and producing very worthwhile results. <br /> <br />- 5 - <br />