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<br />nno7'r~ <br /> <br />Assuming data on these figures are representative of the Basin, two <br /> <br />bas ic guidelines can be formed: <br /> <br />Best target areas are generally above 9,500 feet m. s. 1. <br /> <br />based on temperature- elevation I'elations. <br /> <br />Best seeding season [5 normally November through April <br /> <br />when average monthly temperatures above 9,500 feet are <br /> <br />below freezing. <br /> <br />Runoff and Target Areas <br /> <br />1\lost of the Upper Colorado River Basin runoff originates in the alpine <br /> <br />and sub-alpine watersheds where precipitation amounts are high and <br /> <br />evapotranspiration losses are low. These impol'tant runoff-producing <br /> <br />watersheds cover only a small part of the total Basin. Since these <br /> <br />watersheds are at opportune elevations for ground seeding, feasibly <br /> <br />applying weather modification techniques to small areas for signif- <br /> <br />icantly augmenting water supplies becomes a real possibility. <br /> <br />The major runoff producing areas of the Basin shown In Figure 3 have <br />been defined by Loren \\', CrO\\'. 17/ The total area from which <br />10 inches or more of annual runoff originates is approximately 14,200 <br /> <br />square miles. The estimated avel~age runoff from these most pro- <br /> <br />ductive areas is about 13 inches. The additional areas shown in <br /> <br />17/Crow, Lo:~n \\..' ','Report on :\lajor Su?-Basin Ta~%et Areas for <br />Weather l\loultlcatlOn In l;pper Colorado RIver Basm. Report 53, <br />Denver, Colorado, :\larch 1967. <br /> <br />11 <br />