Flow available at a target residual
Project the flow available at the residual the design asks for, from the readings you took on site.
What this determines. This projects how much flow the supply can still deliver at the residual pressure the design asks for — not just the flow you measured at the test pressure.
Your readings
What is the 0.54 exponent?
Q₂ = Q₁ × ((Pstatic − Ptarget) / (Pstatic − Ptest))⁰·⁵⁴. It is the usual way to move a test point along a water-supply curve.
More tools
Hydrant flow from a pitot reading
Convert a pitot pressure and nozzle diameter into flow.
Pressure and flow unit converter
kPa, bar, psi, metres of head. L/min, L/s, m³/h, gpm.
K-factor calculator
Solve Q = K√P for flow, K or pressure.
Pump total head
Discharge minus suction, in metres of head.
Flow test discharge volume
Flow times duration — litres on the driveway.
Join the waitlist
Leave your name and email and we will notify you when Oz Fire Wizard goes live.