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<br />. <br /> <br />The NAWC study estimate is based on application of watershed <br />models (which include evaporation and other losses) and on cloud <br />models of individual storm and rawinsonde data for 20 years <br />(1952-71). This report appears most consistent with current <br />physical analyses and evaluations of seeding experiments and <br />although considered to be the best, and most conservative, run- <br />off augmentation estimate at this time, an updated study will be <br />made with current data. <br /> <br />It is estimated that the San Juan operational pro~ect will pro- <br />duce increased streamflow yields of 100 million m (81,000 <br />acre-ft) in the Colorado River Basin and 49 million m3 (40,000 <br />acre-ft) in the Rio Grande River Basin annually. These estimates <br />have taken into account randomization and suspension for both <br />high precipitation periods and social considerations. <br /> <br />With implementation of Basinwide operations after 1989, the <br />flow will be increased in the Colorado River Basin by an <br />estimated 1.7 billion m3 (1.4 million acre-ft) and approxi- <br />mately 490 million m3 (400,000 acre-ft) in the adjoining basins. <br />These estimates, developed from the North American Weather <br />Consultants Twelve Basin Investigation Study, were reduced <br />for suspensions. <br /> <br />This overview of previous analysis efforts for the Colorado <br />River Basin and adjacent areas illustrates the potential of <br />precipitation management as a resource management option. The <br />proposed augmentation potential and cost-benefit assessment <br />studies will result in more definitive projections of water <br />yield increases and improved cost-benefit projections for the <br />operational mode. <br /> <br />111-4 <br />