Hazen Williams Mean Fluid Velocity Calculator

Calculate Mean Fluid Velocity

A typical value for new cast iron is 100, PVC is 150.
mm
Enter the internal diameter of the pipe in millimeters.
m/km
Head loss per unit length (e.g., meters per kilometer).

Calculate mean fluid velocity in pipes with our Hazen Williams Calculator. Quickly determine water flow speed for engineering and hydraulic applications, considering pipe roughness and diameter.

Formula:

The Hazen-Williams formula for mean fluid velocity is:
V = 0.355 × C × D0.63 × S0.54
Where:

  • V = Mean Fluid Velocity (m/s)
  • C = Hazen-Williams Roughness Coefficient (dimensionless)
  • D = Pipe Diameter (m)
  • S = Hydraulic Gradient (m/m)

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