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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 V-DITCH 1 ' DEEP & 81 TOP <br /> n VALUE: 0.030 <br /> s (SLOPE) : 0.0020 <br /> s/s (RATIO TO 1 ) : 4.00 <br /> DEPTH: 1 .00 Ft. <br /> BOTTOM WIDTH: 0.00 Ft. <br /> Top Width: 8.00 Ft. <br /> Area:--------------------------------------4.00 Sq. Ft.------------------ <br /> Wetted Perimeter: 8.25 Ft. <br /> Hydraulic Radius: 0.4851 <br /> R' (2/3) : 0.6174 <br /> Velocity: 1 .3675 fps <br /> Flow Quantity : 5.4701 cfs <br /> 2� <br />