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Ditch J -11 Optional <br />Manning's Equation <br />Flow in 30" Half Culvert <br />Flow Depth D 0.80 <br />Slope S 0.08 <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) *(RA.667) *(S ".5)= <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Feet <br />Express as Decimal <br />Express as Decimal <br />1.35 FEET A2 <br />3.01 FEET <br />0.45 <br />8.23 FT /SEC <br />11.11 CFS <br />11.00 CFS <br />30' 1/2 CILVERT 0.45' FREEBOARD <br />AREA <br />r <br />i <br />WETTED PERlwrER <br />1.25' FLOW DEPTH .80' FLow DEPTH <br />(MAXIMUM) <br />Ditch J -11 Optional <br />Manning's Equation <br />Flow In a Trapezoidal "Smart Ditch" Channel <br />Depth D 0.6 <br />Feet <br />Width W 1.12 <br />Feet <br />Slope S 0.08 <br />Express as Decimal <br />Mannings "N" N 0.022 <br />Express as Decimal <br />Side Slope X 1.3 <br />Slope = X:1 <br />AREA= (W *D) +(X *DA2)= <br />1.14 FEET A2 <br />WETTED PERIMETER= (W) +2 *[((X *D)A2 +DA2) "0.5] 3.09 FEET <br />R= AREA/WETTED PERIMETER <br />0.37 <br />V= (1.49/N) *(RA.667) *(S ^.5)= <br />9.86 FT /SEC <br />Q =AXV= <br />11.24 CFS <br />Q REQUIRED - Peak Discharge <br />11.00 CFS <br />TR -91 Volume XI App. B -63ii 10/14 <br />