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<br />b. About 10 percent are treatable to give at least <br />a 100 percent precipitation increase from the dynamic <br />effects of ice-phase seeding. <br /> <br />c. About 10 percent are treatable with ice-phase <br />seeding to give a 50 percent precipitation decrease. <br /> <br />d. About 30 percent are treatable with hygroscopic <br />seeding to give at least a 100 percent precipitation <br />increase. <br /> <br />Of the 20,000 convective cells expected to occur over the <br />study area in one season, about 800 will be seeded. Selec- <br />tion of events for seeding will be subject to suspension cri- <br />teria as discussed in chapter 4. It is estimated that 50 to <br />75 kilograms (110 to 165 lb) of silver iodide will be released <br />at each site if seeding occurs for the full 5-month project <br />season. Most of this will be released near cloudbase. The <br />urea-ammonium nitrate seeding material will be applied at the <br />rate of- about 570 liters (150 gal.) per cloud. If about half <br />the cells are seeded with this material, some 227,000 liters <br />(60,000 gal.) of urea-ammonium nitrate solution [about 272 tonnes <br />(300 tons) of dry material] will be released each season at each <br />site, again assuming seeding occurs for the full 5-nonth period. <br /> <br />Installation of the radar and other instrumentation will require <br />sone construction (fig. 1-7). The radar will be mounted on <br />se~ipermanent concrete pads. The rain gage network will require <br />a minimum of construction, but one or more satellite-interrogated <br />gage clusters will require housing for the telemetry equipment. <br />Access to all project equipment and instrumentation will be by <br />existing roads or over open terrain. <br /> <br />The High Plains Cooperative Program showed steadily increasing <br />expenditures in 1975 and 1976. Full activity will be reached in <br />1978 and the level of effort will remain constant through 1980. <br />A radar used to study clouds and control aircraft in the High <br />Plains Project is shown in figure 1-7. <br /> <br />1.3.2. Uinta Ecology Project. - The Uinta Ecology Project was <br />begun in the spring of 1976 and completion is currently planned <br />for 1979. Its purpose is to study the potential ecological <br />effects of weather modification in the Upper Colorado River <br />Basin. Investigations will address questions not answered by <br />previous studies and will help determine whether knowledge <br />gained in one area can be extrapolated to another area. It is <br />being conducted for the Skywater Program by Brigham Young <br />University. <br /> <br />1-14 <br />