Water Supply Tool

Hydrant Flow Calculator

Estimate available hydrant flow, pitot/outlet flow, and usable water supply for training and preplanning.

Inputs

Static pressure (PSI)

Residual pressure (PSI)

Measured flow during test (GPM)

Target residual pressure (PSI)

Add pitot/outlet calculation?

Outlet diameter (in)

Pitot pressure (PSI)

Discharge coefficient

Training/reference aid only. Follow department SOPs, instructor direction, manufacturer data, and local conditions.

Results

Available flow at target residual

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Pressure drop used

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Pitot/outlet flow

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Hydrant status

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Enter values and calculate.

What this tells you

Use this to estimate hydrant available flow at a selected residual pressure, commonly 20 PSI for training. The pitot option helps when you have outlet diameter and pitot pressure instead of a known flowing GPM.

Hydrant testingAvailable GPMWater supply planning