Hazen-Williams Hydraulic Radius Equation

This hydraulic radius formula is used in Hazen-Williams equations and the coefficient formula.

 

Hazen-Williams Hydraulic Radius Equation formula

\(\large{ r = \left(   \frac {v} { 1.318\;C\;   m^{0.54} } \right)       ^{\frac {1}{0.63} }  }\)

Where:

\(\large{ r }\) = hydraulic radius

\(\large{ C }\) = Hazen-Williams coefficient

\(\large{ m }\) = hydraulic grade line slope

\(\large{ v }\) = mean flow velocity