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APPENDIX 2.05.3-10A <br />• <br />NORTHWEST SEDIMENT TRAP <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />Sedimentation Trap Design - Map 19 <br />DESIGN VOLUME <br />Precipitation 10-year, 24-hour ppt <br />25-year, 24-hour ppt <br />100-year, 24-hour ppt <br />Runoff 10-year, 24-hour <br />25-year, 24-hour <br />100-year, 24-hour <br />Drainage Area EI + E2 13.7 acres <br />E1 = 11.8 acres <br />E2 = 2.1 acres <br />C~ <br />Channel Length = 1800 feet <br />Area Number = 75 <br />Slope Adjustment Factor: <br />Peak Flow Calculation <br />Q10 = (45 cfs/in)(.20 inches) = 90 cfs <br />Slope <br />Slope Factor <br />Equivalent Drainage <br />Equivalent Peak Flow <br />Per Inch Runoff <br />1.6 inches <br />2.0 inches <br />2.5 inches <br />0.20 inches <br />0.38 inches <br />0.71 inches <br />= 15~ <br />_ .99 <br />= 40 acres <br />9 cfs 11.8 (,99) = 2.6 cfs <br />40 <br />Q25 = 45 cfs/in (.38 inches) = 17.1 cfs <br />17.1 cfs 1408 (.99) = 4.5 cfs <br />Q100 = 45 cfs/in (.71) = 31.95 cfs <br />31.95 cfs 1~~ (.99) = 9.3 cfs <br /> <br />- 300 - <br />= 45 cfs for 40 acres <br />in' c~Ties <br />(Rev. 5/86) <br />