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4100 = 103 (56.6)0.710 = 1808cfs x 0.5 = 904cfs <br />• 4500 = 137 (56.6)0'713 = 2435cfs x 0.5 = 1218cfs <br />E. S. C. Sub-basin Below M. C. < 6500' <br />A = 30.8mi2 (planimetered) <br />410 = 59.7 (30.8)0.709 = 678cfs <br />450 - 89.1 (30.8)0.709 = 1012cfs <br />4100 = 103 (30.8)0.710 = 1174cfs <br />4500 = 137 (30.8)0.713 = 1578cfs <br /> <br />Peak Discharges for Southern <br />Plateau Region <br /> <br />410 522 + 678 = 1200cfs <br />450 - 779 + 1012 = 1791cfs <br />4100 = 904 +1174 = 2078cfs <br />4500 = 1218 +1578 = 2796cfs <br />Flood Depths for Southern Plateau Region <br />D10 = 1.25 (87.4)0.261 = 4.0 ft <br />D50 = 1.54 (87.4)0.254 = 4.8 ft <br />D100 = 1.64 (87.4)0.254 = 5.1 ft <br />D500 = 1.98 (87.4)0.239 = 5.8 ft <br />STD Error of Estimates, ~ <br />Average Range <br />47 +58 to -36 <br />50 +62 to -38 <br />53 +66 to -40 <br />65 +84 to -46 <br />25 +28 to -22 <br />34 +40 to -28 <br />36 +42 to -30 <br />44 +53 to -35 <br />3 - Compare Mountain Region flood discharges and depths (already <br />computed - See E. S. C. near Mack calculations) with Southern <br />Plateau Region discharges and depths. Select larger of two <br />flood discharges and depths for each recurrence interval for <br />use as design flood discharge and depth values. <br /> <br />Reference: LWCB Technical Manual No. 1, 1976 <br />