Hazen-Williams Pipe Flow Calculator
Calculate pipe flow velocity, discharge, and head loss using the Hazen-Williams formula for water supply and pressure pipe systems.
Engineering Formulas
Hazen-Williams Equation
Engineering Notes
Assumptions
Common Mistakes
Frequently Asked Questions
What is the Hazen-Williams equation used for?
The Hazen-Williams equation calculates flow velocity, discharge, and head loss in pressure pipes for water supply systems. It's widely used for water distribution network design, pump sizing, and pipeline sizing.
What is the Hazen-Williams coefficient C?
The Hazen-Williams coefficient C represents pipe roughness. Higher values (e.g., 150 for PVC) indicate smoother pipes with less friction loss. Lower values (e.g., 60 for corrugated metal) indicate rougher pipes with more friction loss.
What is the difference between Hazen-Williams and Darcy-Weisbach?
Hazen-Williams is empirical and simpler, best for water at typical temperatures. Darcy-Weisbach is more theoretically rigorous and applies to any fluid and temperature. Hazen-Williams is preferred for water distribution design in the US.