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Ditch J -11 Optional <br />Manning's Equation <br />Flow In a 30" Half Culvert <br />Flow Depth D 0.80 <br />Feet <br />Slope S 0.08 <br />Express as Decimal <br />Mannings "N" N 0.03 <br />Express as Decimal <br />AREA = Number Derived in AutoCad <br />1.35 FEET "2 <br />WETTED PERIMETER= (2 *Pi *r) /2 <br />3.01 FEET <br />Number derived in AutoCad <br />R= AREA/WETTED PERIMETER <br />0.45 <br />IV= (1.49/N) *(R ^.667) *(S ^.5) = 8.23 FT /SEC <br />IQ =AXV= 11.11 CFS <br />IQ REQUIRED - Peak Discharge 11.00 CFS <br />1.25' FLOW DES 1 ri <br />(MAXIMUM) <br />30' 112 Ct LVERT <br />.SO' Flow <br />0.45' FRe <br />VETTED PERIMETER <br />TR -92 Volume XI App. B -53ii 08/14 <br />