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where: Tc = X11.9 L 3 0.385 <br />H <br />• <br />L = 0.758 miles <br />H = 270 feet <br />Tc = 0.218 Hr. <br />The results of the SEDIMOT II analysis indicates a peak discharee of 26.7 <br />cfs. This runoff is used to size the containment ditch and Culvert No. <br />49b under the existing C1 haul road. <br />The sizing of the ditch was analyzed using Dodson and P.ssociates, Inc.'s <br />"Trapezoidal Channel Analysis Frogram" based on Manning's equation <br />calculations. Following is the results. <br />Trapezoidal Channel Analysis <br />Normal Depth Computation <br />• Flow Rate (cubic feet per second) 26.7 <br />Channel Bottom Slope (feet per foot) 0.01 <br />Manning' s Roughness Coefficient (n-value) 0.025 <br />Channel Side Slope - Left Side (horizontal/vertical) 2 <br />Channel Side Slope - Right Side (horizontal/vertical) 2 <br />Channel Bottom Width (feet) 0.0001 <br />Results <br />Normal Depth (feet) 1.66 <br />Flow Velocity (feet per second) 4.87 <br />Froude Number 0.943 <br />Velocity Head (feet) 0.37 <br />Energy Head (feet) 2.02 <br />Cross-Sectional Area of Flow (square feet) 5.48 <br />Top Width of Flow (feet) 6.62 <br />• In conclusion, a V-ditch with 2:1 side slopes and a slope of 1.0 percent <br />A-2 02/13/E7 <br />