### Hazen-Williams Water Pressure Drop Flow Rates Equations and Calculator

**Fluid Flow Table of Contents
Hydraulic and Pneumatic Knowledge**

**Hazen-Williams Water Pressure Drop Flow Rates Equations and Calculator**

The **Hazen–Williams equation **is an empirical relationship which relates the flow of water in a pipe with the physical properties of the pipe and the pressure drop caused by friction. It is used in the design of water pipe systems such as fire sprinkler systems , water supply networks , and irrigation systems. It is named after Allen Hazen and Gardner Stewart Williams.

The Hazen–Williams equation has the advantage that the coefficient *C *is not a function of the Reynolds number , but it has the disadvantage that it is only valid for water . Also, it does not account for the temperature or viscosity of the water.

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