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Open Channel Calculation -Trapezoidal Design <br /> Project: FOOTHILL SANITARY LANDFILL <br /> 41 DESCRIPTION: CLOSURE DRAINAGE CALCULATIONS <br /> CALCS. ARE BASED ON MANNINGS FORMULA <br /> NOTE: CAPACITY OF A DITCH 0.5' DEEP, 18' WIDE TOP -AREA "N" <br /> n VALUE: 0.030 <br /> s (SLOPE): 0.0600 <br /> s/s (RATIO TO 1): 10.00 <br /> DEPTH: 0.50 Ft. <br /> BOTTOM WIDTH: 8.00 Ft. <br /> Top Width: 18.00 Ft. <br /> -––-------–----- ----------–-- ---—------------------------ ------------ <br /> Area: 6.50 Sq. Ft. <br /> Wetted Perimeter: 18.05 Ft. <br /> Hydraulic Radius: 0.3601 <br /> R^(2/3): 0.5062 <br /> Velocity: 6.1412 fps <br /> Flow Quantity: 39.9176 ds <br /> Design for East Ditch, Top of Landfill (Area N) <br /> 4P <br />