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<br />OOtl73~ <br /> <br />feasibly used within the next 10 years. Given an applied research and <br /> <br /> <br />engineering effort to refine and confirm present cloud seeding techniques <br /> <br /> <br />and provide analysis of parameters in storms pertinent to a more fully <br /> <br /> <br />identified seeding criteria, a justifiable continuous operation could be <br /> <br /> <br />initiated in the Upper Colorado River Basin within 10 years involving: <br /> <br />Seeding within well-defined and localized target areas by <br /> <br /> <br />remote-controlled ground- based generators using silver <br /> <br /> <br />iodide <br /> <br /> <br />Seeding susceptible winter storms at high elevations to increase <br /> <br /> <br />winter snow pack <br /> <br />Not considered in this paper are modification of winter precipitation in <br /> <br /> <br />the lower and midelevations of the Basin and summer precipitation <br /> <br /> <br />throughout the region. Feasible development of these further water <br /> <br /> <br />augmentation potentials will probably require more sophisticated <br /> <br /> <br />techniques and resolution of the more complex environmental aspects <br /> <br /> <br />than are involved with high elevation winter seeding. Continued improve- <br /> <br /> <br />ment of the techniques assumed available by the mid-1970's and develop- <br /> <br /> <br />ment of completely new methods represent spectulative possibilities <br /> <br /> <br />for further enhancing Basin water supplies through weather modification. <br /> <br />Temperature and Seeding Criteria <br /> <br /> <br />Preliminary selection of target areas and identification of the possible <br /> <br /> <br />seeding season depends to a large extent on meeting temperature <br /> <br /> <br />parameters of cloud seeding criteria. <br /> <br />7 <br />