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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 1 ' DEEP 81 BOTTOM <br /> n VALUE: 0.030 <br /> s (SLOPE) : 0.0020 <br /> a/c (RATIO TO 1 ) : 2.00 <br /> DEPTH: 1.00 Ft. <br /> BOTTOM WIDTH: 8.00 Ft. <br /> Top Width; 12.00 Ft. <br /> ----------------- --------------- ------------------ <br /> Area; 10.00 Sq. Ft. <br /> Wetted Perimeter; 12.47 Ft. <br /> Hydraulic Radius : 0.8018 <br /> R' (2/3) : 0.8631 <br /> Velocity; 1.9118 fps <br /> Flow Quantity : 19.1183 cfs <br /> AO <br />