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APPENDIX 2,05.3-6A (Continued) <br />• <br />Discharge Calculations, Continued <br />Area B <br />Area = 38.4 acres <br />Change in elevation = 405 feet <br />Channel length = 2600 feet <br />CN number* = 75 <br />Precipitation* <br />100-year/24-hour - 2.3 inches <br />25-year/24-hour - 2.0 inches <br />10-year/24-hour - 1.6 inches <br />Runoff* <br />100-year/24-hour - 0.59 inches <br />25-year/24-hour - 0.38 inches <br />10-year/24-hour - 0.20 inches <br />Slope adjustment factor* <br />Slope of 15.6$ - 18.62 <br />Adjustment - Z.79 <br />• Equivalent drainage area* - 67 acres <br />Equivalent peak flow* = b9 cfsJin for 67 acres <br />Lalcutations: <br />Q 100 yr. _ (64 cfs) (.59) = 40.7 cfs 3~ (.99) = 23.1 cfs <br />Q 25 yr. _ (69 cfs) 1.38) = 26.2 cfs 3~ (.99) = 14.9 cfs <br />Q SO yr. _ (69 cfs) (.20) = 13.8 cfs 3~ (.99) = 7.8 cfs <br />* Source - USDA-SCS Technical Release No. 55 and Procedures for Determining Peak <br />Flows in Colorado, March 1980. <br /> <br />- 250 - (Rev. 5/86) <br />