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<br />analysis indicated positive effccts of the same seasonal magnitude. The experiment is <br />summarized in Super and lleimbach (1983). <br /> <br />7.2 Operational Programs <br /> <br />Utah Power and Liehf <br /> <br />A winter snowpack augmentation seeding project was conducted by North American <br />Weather Consultants (NA WC) for Utah Power & Light (UP&L.). focused on portions of the Bear <br />Lake watershed. Including the Thomas Fork and Smith's Fork region of Wyoming. The project <br />used ground-based solution-burning Agl generators .md \....as conducted during the periods of <br />1955-1970. 1980.1982. plus 1989 and 1990. An historical targeUcontrolmathematical <br />evaluation of snow pack during the 18 winter seasons through 1982 (Griffith et al. 1983) <br />indicated a positive difference of 11 percent. reported as statistically significant at the .055 level <br />using the one-tailed Student's ttest. That analysis also presented a convincing double-mass plot <br />oftargct and control seasonal snO\vpack data encompassing the pre-project (statistical base <br />period) years and the subsequent seeded and embedded not-seeded years. <br /> <br />Utah Proiects <br /> <br />NA WC has been the cloud seeding contractor for a numbcr of Utah winter snowpack <br />augmentation projects covering much of the mountainous terrain in the state since the mid- <br />1970's (Griffith et al. 1991: Griflith et al. 1997; Staullcr. 2002). Thesc projects cmploy ground~ <br />based Agl solution-burning generators in valley and foothill locations. Numerous mathematical <br />evaluations have been conduetcd of those projects. some now spanning more than 25 years. The <br />results of the historical target/control analyses of possible seeding effects averaged ovcr multiple <br />season range from 9% to 21 % increases. with a gradient of apparent effects increasing from <br />south to north for the project areas located west of and on tbe up\\'ind slopes of thc primary <br />north~south oriented Wasatch Range. <br /> <br />Nc".ada/l>esert Research Institute Proiccts <br /> <br />The State ofNcvada. through the Desert Research Institute (DRI) has conductcd cloud <br />seeding since the 1960's. beginning in the Tahoe area and expanding to other areas in more <br />recent decades. These projects are an outgrO\vth of DRI weather modification research programs <br />funded through Reclamation and the National Oceanic and Atmospheric Administration. The <br />projects employ automated ground-based Agl solution-burning generators and have heen in <br />operations since the 1980's. DRl's estimates of seasonal seeding effectiveness have indicated <br />increases ranging from 4% to 10%. <br /> <br />Boise Rinr Board of Control <br /> <br />NA we has operated an operational cloud seeding project for the Boise River drainage in <br />southwestem Idaho for several years beginning with the winter of 1992~93. The seed mode <br />involves ground-based Agl solution burning generators in valley and mountain locations. <br />Mathematical. larget/eontrol. estimations of seeding etTectivcness over eight winter seasons <br />indicate average seasonal increases oflhe order of 5% to 8% (Gritlith et al. 2005). <br />