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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: FIND CAPACITY OF A DITCH 1.0' DEEP & 8 ' BOTTOM <br /> n VALUE: 0.030 <br /> s (SLOPE) : 0.0020 <br /> s/s (RATIO TO 1 ) : 1.75 <br /> DEPTH: 1.00 Ft. <br /> BOTTOM WIDTH: 8.00 Ft. <br /> Top Width: 11.50 Ft. <br /> ---------------------------------- ------ <br /> Area: 9.75 Sq. Ft. <br /> Wetted Perimeter: 12.03 Ft. <br /> Hydraulic Radius: 0.8104 <br /> R" (2/3) : 0.8592 <br /> Velocity: 1 .9255 fps <br /> Flow Quantity: 18.7735 cfs <br /> 28 <br />