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Table 2 <br />Working Area, Haul Road and Loadout Area Ditches <br />Item Ditches <br />(1) (2) (3) (4) (5) (b) (7) <br />Ditch No. 7 8 9 10 11 12 <br />Designation Working <br />Area <br />Ditches <br />Maximum Drainage Area (acres) 103 <br />Design Category Mining <br />Duration <br />Design Precipitation Frequency (years) <br />Runoff Coefficient <br />Rainfall Intensity (in/hr) <br />Design Flow (cfs) <br />Average Slope (%) <br />Roughness Factor, Manning's n <br />Design Depth (feet) <br />Design Width (feet) <br />Velocity (ft~sec) <br />10 <br />CN78 <br />0.77 <br />27 <br />0.4 <br />0.03 <br />0.9 <br />1.0 <br />2.3-10.0 <br />Haul Road <br />Type 1 Type 2 Type 3 <br />38 81 147 <br />Mining Mining Mining <br />Duration Duration Duration <br />10 10 10 <br />0.40-0.61 0.43-0.48 -0.43 <br />0.77 0.77 0, n <br />18 35 48 <br />5.5 6.0 5.0 <br />0.03 0.03 0.03 <br />1.5 1.1 0.9 <br />2.0 4.0 6.0 <br />9.2 10.2 9.7 <br />• <br />Loading Area <br />Diversion around Loadout <br />GossardLoadout CollectionDitches <br />120 7 <br />Mining Mining <br />Duration Duration <br />10 10 <br />0.34 0.52 <br />0.77 0.77 <br />31 (, <br />0.5 3 <br />0.03 0.03 <br />1.5 0.9 <br />4.0 1.0 <br />3.4 5.9 <br />