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10/24/96 page 5 <br />SANBORN CREEK MINE <br />COAL WASTE BANK DESIGN <br />2.0-INCH 10 YEAR, 24 HOUR STORM EVENT <br />REACH SUMMARY <br />DITCH REACH ID No. DO1 <br />Ditch Length: 170.00 ft Ditch Width: 0.00 ft <br />Side Slopel 1.00 Ditch Slope: 0.0200 ft/ft <br />Side Slope2 1.00 Contrib Bas: A3 <br />Mannings n :0.0250 Dn Invert 0.00 ft <br />Dn W.S. Elev:0.0000 Num Steps 10 <br />Trib Area: 1.38 Ac. Design Flow 0.03 cfs <br />Depth 0.16 ft Vel 1.23 fps <br />Upstream W.S. Elev: 0.00 ft. <br />DITCH REACH ID No. D02 <br />Ditch Length: 340.00 ft Ditch Width: 0.00 ft <br />Side Slopes 1.00 Ditch Slope: 0.0200 ft/ft <br />Side Slope2 1.00 Contrib Bas: Al <br />Mannings n :0.0250 Dn Invert 0.00 ft <br />Dn W.S. Elev:0.0000 Num Steps 10 <br />Trib Area: 2.85 Ac. Design Flow 0.06 cfs <br />• Depth 0.21 ft Vel 1.47 fps <br />Upstream W.S. Elev: 0.00 ft. <br />DITCH REACH ID No. D04 <br />Ditch Length: 160.00 ft Ditch Width: 0.00 ft <br />Side Slopes 1.00 Ditch Slope: 0.4100 ft/ft <br />Side Slope2 1.00 Contrib Bas: A6a <br />Mannings n :0.0250 Dn Invert 0.00 ft <br />Dn W.S. Elev:0.0000 Num Steps 10 <br />Trib Area: 4.18 Ac. Design Flow 1.97 cfs <br />Depth 0.43 ft Vel 10.81 fps <br />Upstream W.S. Elev: 0.00 ft. <br />DITCH REACH ID No. D05 <br />Ditch Length: 150.00 ft Ditch Width: 0.00 ft <br />Side Slopes 1.00 Ditch Slope: 0.4300 ft/ft <br />Side Slope2 1.00 Contrib Bas: A6b <br />Mannings n :0.0250 Dn Invert 0.00 ft <br />Dn W.S. Elev:0.0000 Num Steps 10 <br />Trib Area: 2.71 Ac. Design Flow 1.95 cfs <br />Depth 0.42 ft Vel 10.98 fps <br />Upstream W.S. Elev: 0.00 ft. <br />