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<br />- <br />. <br /> <br />e <br /> <br />e <br /> <br />IV. Weather Modification Augmentation Potential <br /> <br />Most of the Colorado River Streamflow originates from snowpack at high elevations. <br />The important runoff-producing watersheds cover only about 12 percent of the <br />Upper Colorado River Basin area, but contribute 75 percent of the Basin's total <br />runoff. Approximately 87 percent of the high potential area in the Colorado River <br />Basin are Federal lands. <br /> <br />The average annual water augmentation potential for cloud seeding in the Upper <br />Colorado River Basin was estimated in a 1974 report by the Stanford Research <br />Institute to be 2,300,000 acre-feet in the Upper Basin. A 1,200,000 acre-foot <br />yield was estimated outside the Basin since seeding storms over mountain ranges <br />will increase precipitation on both sides of the crest providing additional runoff <br />in adjacent river basins. A more conservative estimate made in a study by North <br />American Weather Consultants is being used for planning. A 1,315,000 acre-foot <br />~ yield is estimated in the Upper Basin, 298,000 acre-feet from the Mogollon Ri~ <br />area in Arizona and 533,000 acre-feet outside the Basin. <br /> <br />'. <br /> <br />-6- <br />