Manning formula
Input(s)
\(\mathrm{k}\): Conversion factor of \((\mathrm{L} 1 / 3) / \mathrm{T}, 1\) for \(\mathrm{SI}((\mathrm{m} 1 / 3) / \mathrm{s})\)
\(\mathrm{Rh}\): Hydraulic radius \((\mathrm{m})\)
S: Slope of the hydraulic grade line or the linear \(\left(\mathrm{kg} / \mathrm{m}^{3}\right)\)
\(\mathrm{n}\): Manning coefficient (dimensionless)
Output(s)
V: Cross-sectional average velocity \((\mathrm{m} / \mathrm{s})\)
Formula(s)
\[
V=k * R h^{\frac{2}{3}} * \frac{S^{\frac{1}{2}}}{n}
\]
Reference(s)
Wikipedia.org.