Hazen-Williams Pipe Inside Diameter Equation

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

This inside pipe diameter formula is used in Hazen-Williams equations and the coefficient formula.

Hazen-Williams Pipe Inside Diameter Equation formula

$$\large{ d = \left( \frac {Q}{ 0.285 \; C \; m^{0.54} } \right) ^{\frac {1}{2.63} } }$$
Symbol English Metric
$$\large{ d }$$ = inside diameter of pipe $$\large{in}$$ $$\large{mm}$$
$$\large{ Q }$$ = 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 $$\large{ft}$$ $$\large{m}$$