Laserfiche WebLink
<br /> <br />Manning's Equation: <br />A = 1.49 a 3/3 S 1/2 <br />n p 2/3 <br />• <br /> <br />where, <br />roughness coefficient, <br />channel slope, <br />channel cross-sectional <br />perimeter, p, ft. <br /> <br />n = 0.05 <br />S = 0.03 ft./ft. <br />area, a, square feet wetted <br />2-S <br />