Hazen-Williams Flow Rate Equation

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

This flow rate formula is used in Hazen-Williams equations and the coefficient formula.  This formula only works for ambient temperatute and turbulent flow.

 

Hazen-Williams flow Rate Equation formula

\(\large{ Q =  0.285 \; C\; d^{2.63} \;  m^{0.54}  }\) 

Where:

 Units English Metric
\(\large{ Q }\) = flow rate \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\)
\(\large{ C }\) = Hazen-Williams coefficient   \(\large{ dimensionless }\)
\(\large{ m }\) = hydraulic grade line slope \(\large{ ft }\) \(\large{ m }\)
\(\large{ r_h }\) = hydraulic radius \(\large{ ft }\) \(\large{ m }\)
\(\large{ d }\) = inside diameter of pipe \(\large{ in }\) \(\large{ mm }\)

 

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Tags: Equations for Pipe Sizing Equations for Flow Equations for Hazen-Williams