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<br />000908 <br /> <br />t~fi~ <br />;,):::':;~,-::~i <br />:":,~,-~",:~,,,, <br />~~:~~~t <br /> <br />Assuming data on these figures are representative of the Basin, two <br />basic guidelines can be formed: <br /> <br />Best target areas are generally above 9, 500 feet m. s.l. <br /> <br /> <br />based on temperature-elevation relations. <br /> <br /> <br />Best seeding season is normally November through April <br /> <br /> <br />when average monthly temperatures above 9,500 feet are <br /> <br /> <br />below freezing, <br /> <br />~ <br /> <br />Runoff and Target Areas <br />Most of the Upper Colorado River Basin runoff originates in the alpine <br />and sub-alpine watersheds where precipitation amounts are high and <br />evapotranspiration losses are low, These important runoff-producing <br />watersheds cover only a small part of the total Basin, Since these <br />watersheds are at opportune elevations for ground seeding, feasibly <br />applying weather modification techniques to small areas for signif- <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 W'. Crow..!:]) The total area from which <br />10 inches or more of annual runoff originates is approximately 14, 200 <br />s.quare miles, The estimated average runoff from these most pro- <br />ductive areas is about 13 inches, The additional areas shown in <br /> <br />~w. <br />tl~ <br /> <br />17/Crow, Loren W., "Report on Major Sub-Basin Tarp;et Areas for <br />Weather Modification in Upper Colorado River Basin, I Report 53, <br />Denver, Colorado, March 1967. <br />