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<br />have concluded that neither the additional snowfall nor the seeding <br />agent would adversely affect the ecology of the areas as a result of <br />short-term research or demonstration programs. Extended area effects of <br />cloud seeding have also been a matter of concern for more than 30 years. <br />Whi 1 e there is no evi dence to support the percepti on that snowpack <br />augmentation in the mountains will cause a compensating decrease in pre- <br />cipitation in downwind areas (the limited evidence, in fact, suggests <br />accompanying downwind increases), there is a need for definitive study <br />that will address the existence and nature of such effects. <br /> <br />Weather Mod;f;cat;on Augmentat;on Potent;al <br /> <br />Most of the Colorado River flow originates from winter snowpack in <br />high alpine and subalpine watersheds. The contribution to the total <br />basin runoff by summer precipitation is small in comparison to that of <br />winter snowfall. The six major runoff producing areas in the Color-ado <br />River Basin are shown in figure 2. The five areas in the Upper Color-ado <br /> <br />""-, <br /> <br /> <br />CENTRAL COLORADO <br />,. WHITE RIVER PLATEAU <br />2. GRAND MESA <br />3. UPPER COLORADO <br />4. GUNNISON <br /> <br />UPPER GREEN <br /> <br />~u <br /> <br />_ High Water. Yield Areas <br /> <br />Fi gu re 2. <br /> <br />Colorado River Basin High Water Yield Areas. <br /> <br />River Basin produce approximately 75 percent of the total Basin's water <br />supply, while encompassing about 13,000 square miles or about 12 percent <br />of the total Upper Basin area. These areas include the Wind River, Gros <br />Ventre, and Teton Mountains in the Upper Green River watershed of <br />Wyoming, the Uinta Mountains of Utah, and the Park Range,. Central <br />Colorado, and San Juan Mountains of Colorado. The Central Colorado <br />Mountai ns can be further subdi vi ded into the White Ri ver Pl ateau, the <br />Grand Mesa, the Gunnison, and the Upper Colorado watershed areas. The <br />Mogollon Rim in the Lower Colorado River Basin, covering about 9,600 <br />square miles, is the sixth major runoff producing area. <br />