Hazen-Williams Flow through an Open Channel Equation

on . Posted in Fluid Dynamics

Hazen-Williams method is only valid for water flowing at ambient temperatures, the Darcy-Weisbach method should be used for other liquids or gases.  The Hazen-Williams Equation can be used for flow through an open channel or through a pressurized pipe.


Hazen-Williams flow through an open channel Equation formula

\(\large{ v = k \;C \; r_h^{0.63}\; m^{0.54}   }\) 
Symbol English Metric
\(\large{ v }\) = mean flow velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)
\(\large{ k }\) = conversion factor   \(\large{ dimensionless }\)
\(\large{ C }\) = Hazen-Williams coefficient   \(\large{ dimensionless }\)
\(\large{ m }\) = hydraulic grade line slope \(\large{ ft }\) \(\large{ m }\)
\(\large{ r_h }\) = hydraulic radius \(\large{ ft }\) \(\large{ m }\)


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Tags: Flow Equations Open Channel Equations Hazen-Williams Equations