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<br />. <br /> <br />Nearly all the increased precipitation will be rea,lized as runoff during <br />; <br />the spring thaw. Although the new water yieldw:ill occur during the <br />normal high streamflow season, regulation provided by many existing <br />reservoirs in the Colorado River Basin will make virtually all the <br />increase usable water supply, <br /> <br />I <br />I <br />~~~ <br /> <br />OOGn') <br /> <br />Operations and Costs <br /> <br /> <br />Aircraft seeding under winter storm conditions over mountains will <br /> <br /> <br />involve greater operational and maintenance problems than ground <br /> <br /> <br />operations, Costs would be higher per unit of material delivered. <br /> <br /> <br />Blind flying in storms, often at night, near mountainous terrain and <br /> <br /> <br />icing problems in winter storm clouds would present severe safety <br /> <br /> <br />hazards, <br /> <br />~""N-l- 0, <br /> <br />I <br /> <br />Ground- based generators now appear to be the most justifiable and <br />practical for winter seeding in the mountainous areas of the Upper <br />Colorado River Basin where orographic effects are significant in <br />causing precipitation, Diffusion from the generators should carry the <br />seedingpartic1es to desired locations within storm clouds. <br /> <br /> <br />.' <br /> <br />Ground generators would have automatic controls, based on temperature, <br />wind direction, and humidity parameters, with selective remote control <br />overrides, Controlled variable output generators, capable of a wide <br />burn range, should be developed by the time a regular seeding program <br />is initiated, Generator costs might be on the order of $15, 000 apiece, <br />including installation in permanent sites and command systems. With <br /> <br />25 <br /> <br />"./ ,./ <br />././ / <br />J <br /> <br />~~?:!~f:: <br />~IfI~ <br /> <br />'c.~:";."'_:.-.. <br />;~~~~~~~>:~: <br />~~:i~;~~-~";-: <br /> <br />~JIf~_Ifi?_l~t~ <br />