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<br />25 yr. 24 hr. storm occurring in 6 hours <br />from precipitation atlas - precip. = 2.5 inches <br />with given CN = 74 (SCS personnel in Gunnison) <br />Q = runoff = 0.61 inches (tables from Tech Release No. 55) <br />D = duration = 6 hrs. (given by SCS) <br />L = lagtime = 0.104 hrs. (previous calculations in original report) <br />Qi peak rate (in per hr.) <br />=2 <br />1+H X T~ <br />Assumed H = 1.67 <br />Q = 0.61 in. <br />TP = L + D/2 <br />= 0.104 + 6/2 <br />= 3.104 <br />Qi2 2 0.61 = 0.15 in. per hr. <br />1+1.67 3.04 <br />Tr = H (TP) = 1.67 (3.104) = 5.18 hrs. <br />Qp = Qi (645.3) (A) <br />= 0.15 (645.3) (0.032) <br />= 3.10 second-feet or ft.3/s <br /> <br />