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APPENDIX 2.05.3-11D <br />• OUTFLOW DITCH CALCULATIONS <br />IMPOUNDMENTS ON THE BACKFILLED AREA <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />Upper Impoundment - Outflow Calculations <br />Q100 24-hour storm = 29.7 cfs <br />Spillway Width = 10 feet <br />Parabolic Configuration <br />Riprap Roughness Coefficient = 0.07 (riprap D50 8°) <br />Slope, 50 foot drop in 275 feet = 18% <br />Velocity = 5.4 fps Flow Depth = .9 feet <br />Lower Impoundment - Outflow Calculations <br />• 0100 24-hour storm = 25.9 cfs <br />Spillway Width = 10 feet <br />Parabolic Configuration <br />Riprap Coefficient = 0.07 (riprap D50 = 8") <br />Slope = 35% <br />Velocity = 6.6 fps <br />Flow Depth = 0.7 feet <br />• <br />- 315 - (Rev. 5/86) <br />