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• 25, 50, and 75 percent of watershed height <br />(Z). <br />S = 0,25(135 ft)(1Z20 ft + 2260 ft + 2480 ft) <br />4,124,300 ft'` <br />S = 0.067 moderate slope / <br />Slope Adjustment Factor = 1.21 (Appendix E, <br />SCS, 1980) <br />Hydraulic Length = 3120 ft <br />Therefore, equivalent watershed area = 90.5 acres (Appendix E, <br />SCS, 1980) <br />Actual q = equivalent q actual drainage area <br />• (equivalent drainage area <br />Peak flow = (actual q) (inches of runoff) (slope adjustment <br />factor) <br />For a CN of 69,E <br />49 cfs/in.195 acres 1 = 51 cfs/in. <br />190.5 acres <br />51 cfs/in. (0.07 in.)(1.21) = 4.3 cfs ~~~ <br />2. Watershed with collection ditches removed. <br />Area = 64 acres <br />• Average watershed slope <br />9 <br />