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Culvert T -F4 <br />Manning's Equation <br />Flow In a 30" Half Culvert <br />Flow Depth D 0.30 <br />Slope S 0.33 <br />Mannings "N" N 0.015 <br />AREA = Number Derived in AutoCad <br />WETTED PERIMETER= (2 *Pi *r) /2 <br />Number derived in AutoCad <br />R= AREANVETTED PERIMETER <br />V= (1.49/N) *(R 11.667) *(S ^.5) = <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />I * Flow derived from 5.0 Ac. drainage area, CN =90 <br />Feet <br />Express as Decimal <br />Express as Decimal <br />0.34 FEET ^2 <br />1.78 FEET <br />[isit'7 <br />18.93 FT /SEC <br />6.43 CFS <br />4.74 CFS <br />Culvert T -F4 <br />Manning's Equation <br />Flow In a Trapezoidal "Smart Ditch" Channel <br />Depth <br />D <br />0.3 <br />Feet <br />Width <br />W <br />1.12 <br />Feet <br />Slope <br />S <br />0.33 <br />Express as Decimal <br />Mannings "N" <br />N <br />0.022 <br />Express as Decimal <br />Side Slope <br />X <br />1.3 <br />Slope = X:1 <br />AREA= (W *D) +(X *D ^2)= <br />0.45 <br />FEET ^2 <br />WETTED PERIMETER= (W) +2 *[((X *D) ^2 +D ^2) ^0.5] <br />2.10 <br />FEET <br />R= AREANVETTED PERIMETER <br />0.22 <br />V= (1.49/N) *(R ^.667) *(S ".5) = <br />13.98 <br />FT /SEC <br />Q =AXV= <br />6.33 <br />CFS <br />Q REQUIRED - Peak Discharge <br />4.74 <br />CFS <br />TR -91 App. B -106 11/14 <br />