Laserfiche WebLink
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= AREAM/ETTED PERIMETER <br />V= (1.49/N) *(R 11.667) *(S ^.5) = <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Feet <br />Express as Decimal <br />Express as Decimal <br />0.70 FEET ^2 <br />2.31 FEET <br />0.30 <br />11.20 FT /SEC <br />7.84 CFS <br />1.42 CFS <br />Culvert J16 <br />Manning's Equation <br />Flow In a Trapezoidal "Smart Ditch" Channel <br />Depth D 0.2 <br />Feet <br />Width W 1.12 <br />Feet <br />Slope S 0.25 <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 *D "2)= <br />0.20 <br />FEET ^2 <br />WETTED PERIMETER= (W) +2 *[((X *D) ^2 +D "2) "0.5] <br />1.61 <br />FEET <br />R= AREA/WETTED PERIMETER <br />0.12 <br />V= (1.49/N) *(R ".667) *(S ".5) = <br />8.35 <br />FT /SEC <br />Q =AXV= <br />1.65 <br />CFS <br />Q REQUIRED - Peak Discharge <br />1.42 <br />CFS <br />* Please see Smart Ditch product specifications in Volume lll, <br />Exhibit 8, pages 8 -29ii & 29iii <br />MR -180 Volume XI, App. B -38 03/15 <br />