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<br />000731 <br /> <br />ABSTRACT <br /> <br />This paper presents in broad perspective the promising potential for <br />increasing winter precipitation over mountains of the Upper Colorado <br />River Basin. The resulting augmented spring runoff, regulated by <br />existing reservoirs, can provide additional water to meet growing <br />demands for the region where present water supplies are becoming <br />critically short. Increasing the November through April precipitation <br />by 15% over 14, 200 sq mi of target areas generally located at elevations <br />above 9500 ft will yield an average additional runoff of 1,870,000 acre-ft <br />annually. This practical capability to enhance the winter snowfall should <br />be developed by the mid- 1970's through the $25 million applied research <br />field program outlined in the paper. Exclusive of initial research costs, <br />regular production costs by weather modification are estimated at $1. 00 <br />to $1. 50 an acre-ft for the new water. Average additional benefits are <br />estimated to be $20 to $25 million armually, for a highly favorable <br />benefit-cost ratio of about 10 to 1. <br /> <br />Hurley, Patrick A <br />AUGMENTING UPPER COLORADO RNER BASIN WATER SUPPLY BY <br />WEATHER MODIFICATION. Paper, ASCE Ann & Natl Mtg on Water <br />Resrcs Engg, New York, NY, Oct 1967. Bureau of Reclamation, <br />Denver, Colo, 36 p, 2 tab, 7 fig <br /> <br />11 <br />