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• DITCH C12 <br />Channel Type: Trapezoidal, Equal Side Slopes <br />Dimensions: Left Side Slope 2.00:1 <br />Right Side Slope 2.00:1 <br />Base Dimension: 4.00 <br />Wetted Perimeter: 6.69 <br />Area of Wetted Cross Section: 3.13 <br />Discharge: 18.00 cfs <br />Depth of Flow: 0.60 feet <br />Velocity: 5.74 fps <br />Freeboard: 0.30 feet <br />• MANNING'S N = .30 FOR GRASS CHANNEL <br />DITCH C13 <br />• <br />Time of Concentration (SCS Method) <br />Curve Number: 80 <br />Length of Flow (ft): 2047.49 <br />Average Land Slope (percent): 3.5 <br />Time of Concentration (hrs): 0.50 <br />DITCH C13 <br />Graphical Peak Discharge <br />Project: NUCLA MINE <br />By: GL Date: 02/16/06 <br />REVISED MARCH 2006 <br />Attachment 2.05.3(3)-1-27 <br />