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Hazen–Williams Pipe Flow Velocity Calculator

v = 0.8492 · C · R^0.63 · S^0.54 — hydraulic pipe flow.

Calculates flow velocity using the Hazen–Williams equation: V = 0.8492 × C × R_h^0.63 × S^0.54 (SI), where C is roughness coefficient, R_h is hydraulic radius, and S is hydraulic slope.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

m

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

V = 0.8492 · C · R_h^0.63 · S^0.54

In depth

Calculates flow velocity using the Hazen–Williams equation: V = 0.8492 × C × R_h^0.63 × S^0.54 (SI), where C is roughness coefficient, R_h is hydraulic radius, and S is hydraulic slope.