Laserfiche WebLink
<br />fH135V <br /> <br />based silver iodide generators upwind of the area of intended in::reased <br />soowfall. Neither experiment was supported ~ what loUuld be considered <br />adequate instrumentation ~ today' s standards. Consequently, <br />understandill3 of the step-by-step physical processes of snowfall <br />enhan::ement was limited. In spite of this, the results. of both <br />experiments canbined indicate that statistically significant 25-percent <br />in::reases in snowfall can be attrib.lted to seedill3 umer specific <br />meteorological conditions (Mielke et al., 1981). <br /> <br />'lhe Colorado River Basin pilot Project (CRBPP) was condllCted to <br />refine the results of Climax I arxi II. Seedill3 was to be attenpted only <br />urxier conditions that Climax I arxi II had identified as optimum. Precise <br />identification of these COn9itions, howe~r, proved difficult. <br />Consequently, some suitable StOIlllS were rot seeded, while some unsuitable <br />ones were. '!be result was that precipitation on seeded days was no <br />greater than on control days. Subsequent detailed analysis (Elliott et <br />al. , 1978) showed that sno"Pack loUuld have been in::reased ~ 10 to 12 <br />'percent if only the most suitable storms had been seeded, a firxiill3 <br />similar to that of Climax r arxi II: seedill3 , if conducted properly, can <br />in::rease sno"Pack. <br /> <br />Seedill3 for the Wolf Creek Pass Experiment was rarxiomized ~ years <br />rather than ~ stOIIII days as in Climax I and II and the CRBPP. Apparent <br />in::reases in sno"Pack due to seedill3 were estimated at 20 percent <br />(M:lrel-Seytoux and Saheli, 1973). Ibbbs arxi Ragno (1979) have criticized <br />that con::lusion, however. ihey argue that the three seeded seasons had a <br />different predominant storm type than the control seasons, which caused <br />stations in the seeded area to have greater natural snowfall than control <br />stations. 1lris issue is beill3 debated still. <br /> <br />All in all, the eviden::e indicates <br />storms may in::rease seasonal soowpack <br />carefully and knowledgeably. Given <br />instrumentation and seedill3 technique in <br />probable that seedill3 could in::rease <br />approximately 10 percent. <br /> <br />that seedill3 Colorado winter <br />if operations are corxiucted <br />technologiCal advan::es in <br />the past decade, it now seems <br />seasonal winter sno"Pack ~ <br /> <br />43 <br />