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® 4 <br /> Open Channel Calculation - Trapezoidal Design <br /> Project: HARNEY LANE LANDFILL <br /> DESCRIPTION: CLOSURE DRAINAGE CALCULATIONS <br /> CALLS. ARE BASED ON MANNINGS FORMULA <br /> Notes: CAPACITY OF A DITCH 4 ° DEEP 8 ° BOTTOM , <br /> n VALUE: 0.030 <br /> (SLOPE) : 0.0020 <br /> a/c (RATIO TO 1 ) : 1 .00 <br /> DEPTH: 4.00 Ft. <br /> BOTTOM WIDTH: 8.00 Ft. <br /> Top Width: 16.00 Ft. <br /> -------------------------------------------------------------------- <br /> Area: 48.00 Sq. Ft. <br /> Wetted Perimeter: 19.31 Ft. <br /> Hydraulic Radius: 2.4853 <br /> R` (2/3) : 1 .8348 <br /> Velocity: 4.0645 fps <br /> Flow Quantity : 195.0970 cfs <br /> s <br />