Curb Gutter Flow Rate

Written by Jerry Ratzlaff. Posted in Fluid Mechanics

formula

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

Where:

\( Q \) = gutter flow rate

\( n \) = Manning's Roughness Coefficient (Manning's Equation)

\( P \) = wetted perimeter

\( m \) = longitudinal slope

\( Q \) = flow width

Solve for:

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

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

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

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