Hazen-Williams Equation Head Loss due to Friction

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

This head loss due to friction formula is used in Hazen-Williams equations.

Hazen-Williams Equation Head Loss due to Friction Formula

(Eq. 1)  \(\large{ h_f = \frac { 4.73\; l \; \left( \frac {Q}{C} \right) ^{1.852} }{d^{4.87} }  }\)     (US units)

(Eq. 2)  \(\large{ h_f = 4.73  \left( \frac {Q}{C} \right) ^{1.852}  \frac{l}{d^{4.87}}   }\)     (US units)

(Eq. 3)  \(\large{ h_f = 10.7  \left( \frac {Q}{C} \right) ^{1.852}  \frac{l}{d^{4.87}}   }\)     (SI units)

Where:

\(\large{ h_f }\) = head loss due to friction

\(\large{ Q }\) = flow rate

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

\(\large{ d }\) = pipe inside diameter (ID)

\(\large{ l }\) = length of pipe

 

Tags: Equations for Pipe Sizing Equations for Hazen-Williams