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<br />• <br />C~ <br />APPENDIX 2.05.3-11C <br />DITCH DESIGN - WORST-CASE <br />EXPLOSIVE STORAGE AREA <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />Calculations From Bench to Adjacent Meadow - Assumes Pond Full at Time of <br />Q10 = 3.5 cfs (Appendix 2.05.3-8 -Calculations) (refer to Map 19) <br />CN = 75 Slope = 35% <br />Roughness Coefficient = .040 (riprap) <br />Channel Parabolic = 4 feet, 1 foot deep <br />Velocity = 7.5 fps Depth = .313 feet <br />Q25 = 6.7 cfs <br />Velocity = 9.0 fps <br />Q100 = 12.7 cfs <br />Velocity = 10.9 fps <br />Depth = .42 feet <br />Depth = .573 feet <br />Calculation of Flow From Bench to Adjacent Drainage <br />Q10 = 3.5 cfs QP5 = 6.7 cfs Q100 = 12.7 cfs <br />Slope = 80 feet (relief .~ feet = 25% <br />Roughness = .035 <br />Width (Parabolic) = 10 feet, Depth = 6 inches <br />V10 = 5.6 fps <br />V25 = 6.8 fps <br />V100 = 8.3 fps <br />Depth = .2 feet <br />Depth = .28 feet <br />Depth = .37 feet <br />- 313 - <br />(Rev. 5/86) <br />