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• Solution: From Table 5-3 - Tabular discharges for tyre-II <br />storm distribution (csm/in) q = ggl csm/in w/T = <br />p t <br />10 Yr - 24 hr Peak Discharge <br />q10 qp Ad ~10 <br />q1D = (991 csm/in)(9.0041 mi2)(0,54 in) = 2,19 cfs <br />25 Yr - 24 hr Peak Discharge <br />q25 qp Fld 025 <br />q25 =(991 csm/in)(0,9042 mi2)(0,82 in) = 3,33 cfs <br />Use the above peak discharges, q10 and q25, for the inlet ditch <br />design flow and the emergency spillway design flow, respectively. <br />• Reservoir Liquid Volume: <br />Sedimentation Reservoir shall contain the total volume <br />from a 10 yr - 24 hr precipitation event. <br />Detention time for the runoff shall depend upon the <br />water quality. Once the water quality meets or exceeds <br />the standards as set forth in the mine permit, the re- <br />servoir shall be dewatered by siphoning. <br />Volume Surface Runoff, ~sr = 910 X ~d <br />12 in/ft <br />Liquid Volume <br />Vsr = 0,54 x 2,6 ac = 9.117 Ac.-Ft. <br />12 in/ft <br /> <br />= 5,097 cu. Ft. <br /> <br />