Formula used
Average flow rate (GPM) = measured U.S. gallons ÷ elapsed minutes
Worked measured fire-flow rate example
Measured Fire-Flow Rate Calculator example: 240 U.S. gal ÷ 30 min = 8 GPM. That same average is 30.28 L/min or 480 gal/h.
Interpret gallons and flow
Use the value to document a basic measured rate and have fire-protection professionals apply the required test method and design criteria.
System effects the formula omits
Container calibration, timing error, pressure variation, hose and nozzle losses, pump cycling, and supply depletion affect a field flow test.
Questions specific to this calculation
What does a timed-volume fire-flow result represent?
Enter a measured water volume and elapsed time. The result is a simple discharge or drawdown rate in GPM, not the required fire flow for a building or district.