Board Meeting Memorandum 09/08/2003 (B)

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66 JOURNAL OF WEATHER MODIFICATION VOLUME 33 There are six active project areas in Utah. Five large-scale project areas using ground based silver iodide generators include: I the Central/Southern • Utah and the (2) Tooele County Project areas, sponsored by the Utah Water Resources ,. Development Corporation; the (3) West Box Elder and (4) East Box Elder/Cache County Project areas, sponsored by the Bear River Water Conservancy • (, xs>y •: District and Cache County; and the (5) West Uintas .'. ;iµ,� Project Area sponsored by the Weber Basin Water Conservancy District and the Provo River Water : : Users Association_ The total estimated cost for these ?. 4. . „. ; 1_$, •:. projects is $321,9.00, of which the state will cost ry..; c' ?: ' '; ';' 'rr.F, : share 46.7 percent ($150,000). Emery Water• s ? Conservancy District is operating a small-scale project using liquid propane to seed the Wasatch Plateau above Joes Valley Reservoir. This is a continuation of part of the NOA A/Utah Research ' `" Project conducted in the 1990s.••' :,:, ''t:.ry`} ti' '� ; ": ,•,A The Central/Southern Utah Project has operated continuously since water year 1974, with the exception of the extreme wet period from 1984-87. The project has 23 seeded seasons. In some of the early years when higher state funding was available, 6. WINTER PROJECTS multiple cloud seeding aircraft, weather radar, and • rawinsonde operations were used to supplement the A map of the winter projects in Utah for snow ground based silver iodide generator network. The pack augmentation since passage of the 1973 Cloud project area currently has 65 cloud seeding Seeding Act is shown on Figure 3. The map also generators. Using a target and control regression indicates the currently active projects (2001) as well analysis for December through Mardi precipitation, as inactive projects. The contractor for all of the the Central/Southern Utah Project Area indicates a 14 winter projects is North American Weather percent average increase in high elevation target Consultants, Inc., of Sandy, Utah. The goal of these precipitation for this period (Griffith and Solak, projects have primarily been to augment spring and 2000a). summer streamflow to benefit agriculture interests, although some projects have been conducted to Seeding began. in the Tooele County Project augment municipal water supplies. Area in 1976 and continued through the 1982 water year. Seeding resumed in 1989 through 1992 and 6.1 Inactive Projects again in 1996 to the present. There are 16 seeded seasons. The project area has nine cloud seeding There are six inactive project areas. The Ogden generators. Target and control regression analysis River Project Area was cloud seeded in water year shows a December-March high elevation target 1977 and water years 1991 through 1993. The precipitation average increase of 19 percent(Griffith Wasatch Front Project was operated for 10 years in and Solak,2000a). water year 1977 and water years 1988 through 1996. The Uinta Mountains were cloud seeded in water The East Box Elder/Cache County Project Area years 1977 and 1978 and again in 1989. The Carbon has operated 12 years, beginning in 1989. The County and La Sal Mountains projects were operated project area has 22 cloud seeding generators. Target in water years 1978 through 1983 and 1990, for a and control regression analysis shows a December- total of seven years. The Abajo (Blue) Mountains February high elevation target precipitation average Project was operated for 12 years in water years 1976 increase of 20 percent (Griffith and Solak, 2000b). through 1983 and again in water years 1990 through 1993. 6.2 Active Projects(2001) • •