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Open Channel Calculation -Trapezoidal Design <br /> isProject: FOOTHILL SANITARY LANDFILL <br /> 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): 0.0020 <br /> s/s (RATIO TO 1): 2.00 <br /> DEPTH: 2.00 Ft. <br /> BOTTOM WIDTH: 12.00 Ft. <br /> Top Width: 20.00 Ft. <br /> ---------------------------------------------------------------------------------------------------------- ------------ <br /> Area: 32.00 Sq. Ft. <br /> Wetted Perimeter: 20.94 Ft. <br /> Hydraulic Radius: 1.5279 <br /> R"(2/3): 1.3265 <br /> Velocity: 2.9386 fps <br /> Flow Quantity: 94.0355 cfs <br /> Design for East Ditch, Top of Landfill (Area N) <br />