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<br />00091f) <br /> <br />~5f< <br />~~~j <br />f~~ <br />:~':"'C~.~. <br />')'~' c:."~,' <br />j~ <br />?!?H~~ <br /> <br /> <br />I <br /> <br />Figure 3 furnishing 1 inch to 10 inches annual runoff total some <br />9,500 square miles with an average runoff of about 3 inches. Scat- <br />tered areas producing over 10 inches are included in the additional <br />areas, About 4, 500 square miles of these additional areas immediately <br />surround greater water yielding areas. <br /> <br />The entire Colorado River watershed above Lees Ferry, the dividing <br />point between the Upper Basin and Lower Basin, contains 109,500 <br />square miles but has an average annual runoff of only 2. 3 inches. 18/ <br /> <br />Approximately 75 percent of the total Upper Basin runoff comes from <br />the 14, 200 square miles, representing only 13 percent of the Basin <br />land area. Another 10 percent of the Upper Basin runoff is produced <br />in the additional 9,500 square miles yielding 1 inch to 10 inches runoff, <br /> <br /><,.~"'? <br /> <br />II <br /> <br />",>i~' <br /> <br /> <br />I <br /> <br /> <br />:-"o'Ii: <br />>, <br /> <br /> <br />., <br /> <br />The 14, 200 square miles of major areas producing 10 inches or more <br />runoff are the important source of water supply in the Upper Colorado <br />River Basin, These eight runoff areas are generally above the 9, 500- <br />foot elevation level, as indicated by the runoff area--1O, 000 feet <br />elevation relation shown by Figure 4. <br /> <br />The best target areas to consider for operational application are the <br />same eight major areas where annual runoff is over 10 inches. Selec- <br />tion is based on the elevation criteria and high water yield potentials. <br /> <br />13 <br /> <br />:~.-3:~.;';~'" <br />::fi;:~r:\ <br />,"_'0.<_,-.' <br /> <br />~f!1~i <br /> <br />}\i:~.::~'",. <br />;'---;<--:-. <br /> <br />lll/::>chleusener and Crow, p 2, <br /> <br />~~~1Il~~~~~~~ <br />