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
\(\large{ r_h = \left(   \frac {v}{ 1.318\;C\;   m^{0.54} } \right)^{\frac {1}{0.63} }  }\)
Symbol	English	Metric
\(\large{ r_h }\) = hydraulic radius	\(\large{in}\)	\(\large{mm}\)
\(\large{ C }\) = Hazen-Williams coefficient	\(\large{dimensionless}\)
\(\large{ m }\) = hydraulic grade line slope	\(\large{ft}\)	\(\large{m}\)
\(\large{ v }\) = mean flow velocity	\(\large{\frac{ft}{sec}}\)	\(\large{\frac{m}{s}}\)