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Half Culvert J15 <br />Manning's Equation <br />Flow In a 30" Half Culvert <br />Flow Depth D 0.50 <br />Slope S 0.25 <br />Mannings "N" N 0.03 <br />AREA = Number Derived in AutoCad <br />WETTED PERIMETER= (2 *Pi *r) /2 <br />Number derived in AutoCad <br />R= AREA/WETTED PERIMETER <br />V= (1.49/N) *(R ^.667) *(S 11.5) = <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />I *Flow from E. Diversion ditch <br />Feet <br />Express as Decimal <br />Express as Decimal <br />0.70 FEET ^2 <br />2.31 FEET <br />1111011 <br />11.20 FT /SEC <br />7.84 CFS <br />1.42 CFS <br />30' //2 CULVERT <br />AREA <br />0.75' FREEBOARD <br />WETTED PERIMETER <br />1.25' FLOW DEPTH <br />(MAXIMV .50' FLOW DEPTH <br />TR -91 Volume XI, App. B -38 09/14 <br />