Manning's Equation

Written by Jerry Ratzlaff on . Posted in Fluid Mechanics

Mannings equation applies to uniform flow in open channels.

formula

\( Q =  vA  =   \frac  {  1.49 }  { n }  P Q^{2/3}  \sqrt {S}  \)

Where:

\( Q \) = flow rate

\( v \) = velocity

\( P \) = wetted perimeter

\( n \) = Manning’s Roughness Coefficient

\( Q \) = hydraulic radius

\( S \) = channel slope