Curb Gutter Flow Rate

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Curb gutter Flow Rate

Curb gutter Flow Rate Formula

\( Q =  \frac  {  0.56 }  { n }  P^{5/3}  m^{1/2}  q^{8/3}\)          \( gutter \; flow \; rate  \;=\;  \frac  {  0.56 }  { Manning's \; roughness \; coefficient } \; wetted \; perimeter^{5/3}  \;\;x\;\;  slope^{1/2}  \;\;x\;\;  flow \; width^{8/3}\)

Where:

\( Q \) = gutter flow rate

\( n \) = Manning's roughness coefficient

\( P \) = wetted perimeter (roadway cross slope) 

\( m \) = longitudinal slope  

\( q \) = flow width  

Solve for:

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

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

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

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

 

Tags: Equations for Flow Rate