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<br />choice of target areas, there are natural hydrologic and meteorological variables. Then <br />there are those associated with seeding methods. For those methods to be effective, <br />seeding materials must be dispersed in sufficient concentration in cloud regions with <br />adequate supercooled liquid water and temperatures cold enough for the seeding <br />materials to function as intended. An examination of these variables is beyond the scope <br />of this study. There is an in-depth examination, however, in a recent Colorado seeding <br />feasibility study I I. <br /> <br />4. CONCLUSIONS <br /> <br />Within the limitations of the SNODAS data set and stated uncertainties of our <br />calculations we estimate that, for an average precipitation year in the Colorado River <br />Basin, cloud seeding could generate an additional one million acre feet of water storage <br />in the basin-wide snowpack. In drought years, seeding might produce about half that <br />amount, or 500,000 acre feet. In wet years, more than one million acre feet could be <br />produced, but how much more would be limited by seeding suspension criteria. These <br />estimates are close to those of two older studies. Therefore, application of a modern, <br />sophisticated snow modeling and assimilation system has produced water yields similar <br />to the older studies and gives confidence that such yields are accurate. <br /> <br />5. REFERENCES <br /> <br />1. Water and Power Resources Service (Bureau of Reclamation), 1980: Special Report to <br />the Commissioner - Precipitation Augmentation for the Colorado River Basin. Jan. <br />1980. <br /> <br />2. Grant, Lewis 0., 1969: An operational adaptation program of weather modification <br />for the Colorado River Basin; interim report for the period, July 1968-June 1969. Dept. <br />of Atmospheric Science, Colorado State University, Ft. Collins, CO. <br /> <br />3. Weisbecker, Leo W., 1974: The Impacts of Snow Enhancement: A Technology <br />Assessment of Winter Orographic Snowpack Augmentation in the Upper Colorado River <br />Basin, Stanford Research Institute. University of Oklahoma Press, Norman, OK. <br /> <br />4. Elliott, Robert D., Jack F. Hannaford, and Russell W. Shaffer, 1973: Twelve basin <br />investigation: analysis of potential increases in precipitation and streamflow resulting <br />from modification of cold orographic clouds in selected river basins of the western <br />United States, North American Weather Consultants Report No. 15-18 to the Bureau of <br />Reclamation. <br /> <br />5. Carroll, Tom, Don Cline, Greg Fall, Anders Nilsson, Long Li, and Andy Rost, 2001: <br />NOHRSC Operations And The Simulation Of Snow Cover Properties For The <br />Coterminous U.S. 69th Annual Meeting of the Western Snow Conference. Online at <br />http://www .nohrsc.noaa.gov/technology/pdfi'wsc200 l.pdf <br /> <br />8 <br />