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<br /> 14 <br /> 12 FREQJENCY OF <br /> '" ANNUAL VIRGIN FLOWS <br /> a: <br /> ~ 10 1896-1967 <br /> >- <br /> "- 8 <br /> 0 <br /> a: 6 <br /> TEN-YEAR MOVING w <br /> VIRGIN FLOW '" 4 <br /> AVERAGE FLOW ::;; <br /> ::> <br /> z 2 <br /> ESTIMATED UP- <br /> RIVER CONSUMPTION 0 <br /> 25 681012141618202224 25 <br /> FLOW OF ONE YEAR <br /> ~ 1.0 MAF <br /> 20 20 <br /> . . <br /> ..... . . . <br /> fo- . . . . . . <br />cg w . <br />w .. <br /> "- . . <br /> W 15 . 15 <br /> a: . . . ..... . . . <br /> ~U . . '('1 . . . . .1. <br /> 0<1: . <br /> ...."- I .. . . . <br /> ,,-0 <br /> '" I I I I. II <br /> z I <br /> 0 10 10 <br /> ::; <br /> .... <br /> ::;; <br /> 5 5 <br /> 0 0 <br /> 900 910 1920 1930 1&40 1950 960 1970 <br /> WATER YEAR <br /> FIGURE 3 Colorado River flow at Lee's Ferry, Arizona. <br />