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*BETA Version*
Fire Hydrant Flow Calculator
© 2006, Willis Lamm
  • Use the tab key to navigate.
  • Tab between each box to update the calculation.
  • Be sure to tab past your final entry for a correct calculation.
Static:
 psi before flowing
Residual: psi while flowing
Pitot: pitot gage reading
Diameter: size of opening tested
This hydrant is flowing: GPM from the test outlet
Projected available hydrant flow: GPM Note 1
2nd Static: secondary psi before flowing
2nd Residual: secondary psi while flowing
The main can be expected to flow about: GPM
Notes:
  1. Projected available flows calculated at 20 psi residual, or ½ the static pressure for low pressure hydrants having static pressures of less than 40 psi.

  2. This calculator is based on established Hazen-Williams formulas and is provided for convenience and estimation purposes only. The author and FireHydrant.org express no warranty for its suitability for any particular purpose.

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