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Open Channel Calculation - Trapezoidal Design <br /> Project: HARNEY LANE LANDFILL <br /> DESCRIPTION: CLOSURE DRAINAGE CALCULATIONS <br /> CALLS. ARE BASED ON MANNINGS FORMULA <br /> Notes: CAPACITY OF A DITCH 1 ° DEEP 6 ` BOTTOM <br /> n VALUE: 0.030 <br /> (SLOPE) : 0.0020 <br /> a/c (RATIO TO 1 ) : 2.00 <br /> DEPTH: 1 .00 Ft. <br /> BOTTOM WIDTH: 6.00 Ft. <br /> Top Width: 10.00 Ft. <br /> Area: 8.00 Sq. Ft. <br /> Wetted Perimeter: 10.47 Ft. <br /> Hydraulic Radius: 0.7639 <br /> R' (2/3) : 0.8357 <br /> Velocity: 1 .8512 fps <br /> Flow Quantity: 14.8093 cfs <br /> 39 <br />