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<br />ABSTRACT <br /> <br />The purpose of this study was the determination of suitable watersheds or combinations <br /> <br />ofwatersheds for precipitation management programs in the Upper Colorado River Basin in <br /> <br />general and for two special zones: the San Juan Mountains and the Upper Basin of the <br /> <br />Colorado River. <br /> <br />The study shO\;s that the introduction of optimal weight factors in the linear combination <br /> <br />of runoff from several basins will reduce significantly the number of years necessary for <br /> <br />evaluation of the operations. Assuming a uniform 10% increase in winter precipitation <br /> <br />throughout the Upper Colorado River Basin, the calculations show that three years of <br /> <br />operations would be needed in the Upper Basin of the Colorado versus six years in the San <br /> <br />Juan mountains. <br /> <br />vii <br />