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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />.. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />2.0 PROJECT DESIGN <br /> <br />2.1 Backt!round <br /> <br />The operational procedures utilized for the Gunnison River cloud seeding <br />program are the same as those that have proven effective in more than 25 years of cloud <br />seeding in the mountains of Utah. Results from these operational programs have <br />consistently indicated increases in wintertime precipitation and snowpack in the target <br />areas (Griffith, et ai, 1991; 1997). <br /> <br />2.2 Seedabilitv Criteria <br /> <br />NA WC has followed a policy called selective seeding, which is the most efficient <br />and cost-effective method, and provides the most beneficial results. Selective seeding <br />means that seeding is only conducted during specific time periods, and in specific <br />locations, where it is likely to be effective. This decision is based on several criteria <br />which determine the seedability of the storm. These criteria deal with the nature of the <br />atmosphere (temperature, stability, wind flow, and moisture content) both in and below <br />the clouds, and are presented in Table 2-1. Use of this focused seeding methodology has <br />yielded consistently favorable results at very attractive benefit/cost ratios. <br /> <br />2.3 Suspension Criteria <br /> <br />As required in the cloud seeding permit granted by the Colorado Water <br />Conservation Board, seeding operations shall not be undertaken, or shall be suspended, <br />if: <br /> <br />A. The National Weather Service forecasts a storm to produce unusually heavy <br />precipitation that could contribute to avalanches or unusually severe weather conditions <br />in the project area. <br /> <br />2 <br />