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Open Channel Calculation - Trapezoidal Design <br /> Project: FOOTHILL SANITARY LANDFILL <br /> DESCRIPTION: PRELIMINARY CLOSURE DRAINAGE CALCULATIONS <br /> CALCS. ARE BASED ON MANNINGS FORMULA <br /> Notes: CAPACITY OF A DITCH 3 ' DEEP, 12' BOTTOM <br /> n VALUE: 0 .030 <br /> s (SLOPE) : 0 .0020 <br /> s/s (RATIO TO 1) : 2 . 00 <br /> DEPTH: 3 . 00 Ft. <br /> BOTTOM WIDTH: 12 . 00 Ft. <br /> Top Width: 24. 00 Ft. <br /> -------------------------------------------------------------------- <br /> Area: 54 . 00 Sq. Ft. <br /> Wetted Perimeter: 25 . 42 Ft. <br /> Hydraulic Radius: 2 . 1246 <br /> R^ (2/3) : 1. 6527 <br /> Velocity: 3 . 6611 fps <br /> Flow Quantity: 197. 6986 cfs <br /> Design for Landfill Perimeter Ditch <br />