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<br />",.w;{ <br />~::;:~~f.,:.. <br />>~>h$'~'~ <br />@gNj <br />'ir.@o.'7 <br /> <br /> <br /> <br /> <br /> <br /> <br />~,.:v-<~ <br /> <br /> <br /> <br /> <br /> <br /> <br />, ,'jg,~ <br />~~r~ <br />':G.'"'''''' <br />~.~ <br />~.;.,~.:~ <br />~~,~ <br />I <br />~:.~k;QE~~ <br />::(~k:i"i1 <br />::.{/-~.:..:~~:. <br />~}~:;(ri <br />II ~~ <br />f~~.5I'Ig~~{ii.lil:llii~~_:tJ <br /> <br />0"0""0(> <br />'J' ,.( ".. h <br />~. { v - - ",' <br /> <br />ABSTRACT <br /> <br />This paper presents in broad perspective the promising potential for <br /> <br />increasing winter precipitation over mountains of the Upper Colorado <br /> <br />.,,' <br /> <br />River Basin. The resulting augmented spring runoff, regulated by <br /> <br />J~ <br /> <br />existing reservoirs, can provide additional water to meet growing <br /> <br />demands for the region where present water supplies are becoming <br /> <br />critically short. Increasing the November through April precipitation <br /> <br />by 15% over 14,200 sq mi of target areas generally located at elevations <br /> <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 /> <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 /> <br />to $1. 50 an acre-ft for the new water. Average additional benefits. are <br /> <br />estimated to be $20 to $25 million annually, for a highly favorable <br /> <br />benefit-cost ratio of about 10 to 1. <br /> <br />. <br /> <br />Hurley, Patrick A <br />AUGMENTING UPPER COLORADO RIVER BASIN WATER SUPPLY BY <br />WEATIIER MODIFICATION. Paper ASCEAnn & 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 />, <br />~. <br />