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APPENDIX 2.05.3-68 (Continued <br /> <br /> <br /> <br />Area D <br /> Area - 5.6 acres <br /> Change in elevation - 165 feet <br /> Channel length = 650 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-heur - 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 /> 51ope adjustment factor* = 1.06 for a slope of 25.4% <br /> Equivalent drainage area* = 6,8 acres <br /> Equivalent peak flow* 12 cfs for 6.8 acres <br /> in <br />Calculations: <br />Q 100 yr. = 12 T (0.59") = 7.1 cfs ~$ (1.06) = 6.2 cfs <br /> <br />Q 25•yr. = 12 ins (0.38") = 4.6 cfs 3B. (1.06) = 4.0 cfs <br /> <br />Q 10 yr. = 12 ~ (.20'") = 2.4 cfs 6•g ( 1,06) = 2.1 cfs <br /> <br />* Source - USDA-SCS Technical Release No. 55 and Procedures for Determining Peak <br />Flows in Colorado, March 1980. <br />=253- <br />(Rev. 5/86) <br />