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Open Channel Calculation - Trapezoidal Design <br /> Project: HARNEY LANE LANDFILL <br /> DESCRIPTION: CLOSURE DRAINAGE CALCULATIONS <br /> CALCS. ARE BASED ON MANNINGS FORMULA <br /> Notes: CAPACITY OF A DITCH 4 ' DEEP 61 BOTTOM <br /> n VALUE: 0.030 <br /> s (SLOPE) : 0.0020 <br /> c/o (RATIO TO 1 ) : 1.00 • <br /> DEPTH: 4.00 Ft. <br /> BOTTOM WIDTH: 6.00 Ft. <br /> Top. Width: 14.00 Ft. <br /> Area: 40.00 Sq. Ft. <br /> Wetted Perimeters 17.31 Ft. <br /> Hydraulic Radius: 2.3103 <br /> R` (2/3) : 1 .7476 <br /> Velocity: 3.8714 fps <br /> Flow Quantity : 154.8571 ate <br /> b <br />