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<br /> <br />1.0 <br /> <br /> <br />0.8 -- ---- ~-- <br /> <br />- <br />-" ....... I <br /> <br />".....-'1 ___ <br />0,6 _-r: <br /> <br />-f---- - <br />I <br />, <br /> <br />o <br />~ <br />lr <br /> <br />I <br />-1- - - <br />i <br />I <br />I <br /> <br />0.4--- , , <br /> <br />I <br />I <br />i <br />i I <br />t-m-I <br />I I <br /> <br />0,2 ----t-- <br />; <br /> <br />o <br /> <br />2 <br /> <br />4 <br /> <br />6 <br /> <br />e <br /> <br />10 <br /> <br />INTERVAL IN DAYS <br /> <br />Figure 2.6 - Relationship between Antecedent Storm Magnitude and Dry Interval <br /> <br />during this period that the greatest flood threat on the Colorado <br />River above Hoover and Glen Canyon Dams would likely result from the <br />combination of the ULDRS event with the snowmelt hydrograph. <br /> <br />The evaluation of the ULDRS seasonal variation involved the use of <br />both indirect (moisture/wind) as well as direct measures of <br />precipitation. The examination revealed that the ULDRS event for <br />all three centerings could occur with the same magnitude during the <br />period from August 1 through October 31. Prior to August 1, the <br />seasonal variation of the ULDRS would indicate a decrease in <br />rainfall potential. A greater decrease is indicated for the storm <br />centering located in the drainage between Hoover and Glen Canyon <br />Dams than that shown for the two storm centerings located above Glen <br />Canyon Dam. Figure 2.7 indicates the adopted seasonal variation for <br />the three centerings investigated in this study. <br /> <br />27 <br /> <br />