Curb Gutter Flow Rate

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Curb gutter Flow Rate

Curb gutter Flow Rate Formula

\(\large{ Q =  \frac  {  0.56 }  { n }  P^{5/3}  m^{1/2}  q^{8/3}  }\)         

Where:

\(\large{ Q }\) = gutter flow rate

\(\large{ m }\) = longitudinal slope

\(\large{ n }\) = Manning's roughness coefficient

\(\large{ P }\) = wetted perimeter (roadway cross slope)  

\(\large{ q }\) = flow width  

Solve for:

\(\large{ n =  \frac  {  0.56 }  { Q }  P^{5/3}  m^{1/2}  Q^{8/3} }\)

\(\large{ P = \frac { Qn } { 0.56  m^{1/2}  Q^{8/3} } ^{3/5} }\)

\(\large{ m =  \frac { Qn } { 0.56  P^{5/3}  Q^{8/3} } ^2 }\)

\(\large{ Q =  \frac { Qn } { 0.56  P^{5/3}   m^{1/2} } ^{3/8} }\)

 

Tags: Equations for Flow