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A endix B <br />Summa Coal Mine Waste Dis osal Area Ditches and Culverts <br /> Ditch Grade Minimum Grade Maximum Grade RipRap Peak <br /> Min Max De th Veloci De th Veloci so nc Flo <br /> Feet FUSec Feet FUSec cfs <br /> F1 3.5% 3.5% 0.45 3.0 0.45 3.0 9.32 <br /> F2 2% 2% 0.34 1.9 0.34 1.9 3.61 <br /> F3 2% 2% 0.23 1.5 0.23 1.5 1.28 <br /> F4 10% 34% Trapezoid al Channel 18 27.79 <br /> F5 2% 2% 0.38 2.1 0.38 2.1 5.66 <br /> F6 2% 2% 0.40 2.1 0.40 2.1 6.47 <br /> F7 2% 2% Trapezoid al Channel 15 42.94 <br /> F8 2% 2% 0.36 2.0 0.36 2.0 4.34 <br /> F9 5% 45% Trapezoid al Channel 18 9.37 <br /> F10 2% 2% 0.35 1.9 0.35 1.9 3.90 <br /> F11 10% 50% Trapezoid al Channel 18 12.34 <br /> F12 2% 2% 0.40 2.1 0.75 3.2 5.63 <br /> F13 2% 2% 1.14 4.3 1.14 4.3 10.05 <br /> F14 20% 50% Tra ezoid al Channel 18 28.61 <br /> F15 2% 30% Trapezoid al Channel 12 2.34 <br /> F16 10% 10% Trapezoid al Channel 12 8.83 <br /> East Div. 5% 5% Tra ezoid al Channel 3 5.46 <br /> West Div. 5% 10% Trapezoid al Channel 9 2.92 <br />Culvert: <br />F2 42" 38.67 <br /> <br /> <br />Flow de th in feet d oes not include 0.3 feet freeboard. <br /> <br />TRd3 <br />A PPRo ~ <br />9~u~o6 <br />App. B-8 <br />os~os <br />