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5.0 APPENDIX <br />28 <br />5.2 SMARTDITCH FLOW CALCULATIONS <br />Flow rate calculations for the channel system are based on the <br />standard hydraulic flow formula: <br />Q = (1.49/n) A R213 S'rz <br />Where: <br />Q = Total Flow <br />N = Manning's Coefficient of Friction (0.022)' <br />A = area (so <br />R = hydraulic radius (ft) (R = A/ wetted perimeter) <br />S = slope ( %) <br />The designer of record must review the project hydraulics to <br />determine the required channel freeboard. <br />LA <br />E: <br />F: <br />12" (305 MM) TRAPEZOID <br />24" (610 MM) TRAPEZOID <br />24" (610 MM) <br />SEMI - CIRCULAR <br />Max Flow Area Top: <br />Max Flow Width Across Top: <br />Max Flow Width Across Top: <br />34.5" (876 mm) <br />59.5" (1511 mm) <br />24" (610 mm) <br />Max Flow Depth: <br />Max Flow Depth: <br />Max Flow Depth: <br />13.5" (340 mm) <br />25" (635 mm) <br />14" (356 mm) <br />Bottom Channel Width (interior): <br />Bottom Channel Width (interior): <br />Bottom Channel Width (interior): <br />8" (203 mm) <br />12" (305 mm) <br />N/A <br />Mannings: <br />Mannings: <br />Mannings: <br />0.022• <br />0.022• <br />0.022• <br />5.33/1.63 <br />5.00% <br />15,00/0.43 <br />Slope <br />% <br />Flow <br />cfs / m' /s <br />Velocity <br />fps / mps <br />Flow <br />cfs / m3 /s <br />Velocity <br />fps / mps <br />Flow <br />cfs / m3 /s <br />Velocity <br />fps / mps <br />0.50% <br />6.15 /0.17 <br />3.09 /0.94 <br />28.04 /0.79 <br />4.52 /1.38 <br />5.41 /0.15 <br />3.10 /0.95 <br />1.00% <br />8.70/0.25 <br />4.37/1.33 <br />30.50/0.86 <br />4.91 /1.50 <br />7.66/0.22 <br />4.38/1.34 <br />2.50% <br />10.61/0.30 <br />5,32/1.62 <br />48.23/1.37 <br />7.77/2.37 <br />9.31 /0.26 <br />5.33/1.63 <br />5.00% <br />15,00/0.43 <br />7.53/2.30 <br />68.20/1.93 <br />10.99/3.35 <br />13.17/0.37 <br />7.53/2.30 <br />7.50% <br />18.37/0.52 <br />9.22/2.81 <br />85.53/2.42 <br />13.46/4.10 <br />16.13/0.46 <br />9.23/2.81 <br />10.00% <br />21.21/0.60 <br />10.65/3.25 <br />96.46/2.73 <br />15.54/4.74 <br />18.62/0.53 <br />10.66/3.25 <br />15.00% <br />25.98/0.74 <br />13.04/3.98 <br />118.13 / 3.35 <br />19.03/5.80 <br />22.81 /0.65 <br />13.05 / 3.98 <br />20.00% <br />30.00/0.85 <br />15,06/4.59 <br />136.41 / 3.87 <br />21.98/6.70 <br />26.34/0,75 <br />15.07 / 4.59 <br />`A mannings coefficient of 0.029 is used when the velocity exceeds 1.22 mps and flow becomes turbulent. <br />Call SmartDitch at 866 -5- SMARTD (866- 576 -2783) or visit our website at www.smartditch.com <br />Ex14 8'Z7;it' <br />