Work out irrigation pump sizing instantly with clear inputs, formula shown and shareable results.
One acre-inch of water is 27,154 gallons, so area times application depth gives the daily volume directly. Dividing by the minutes the system runs gives the flow the pump must sustain, and the sprinkler operating pressure converted to feet of head sets the duty point.
Daily volume
Gallons = acres x inches x 27154
Flow and power
GPM = gallons / (hours x 60); hp = GPM x head / 3960
Gallons = acres x inches x 27154. One acre-inch of water is 27,154 gallons, so area times application depth gives the daily volume directly.
Yes. Divide the gross application by the system's distribution uniformity, typically 0.75 for sprinklers and 0.90 for drip, otherwise the driest part of the field is under-watered.
This calculator takes 4 inputs: Irrigated area, Daily application depth, Operating hours per day, System pressure required. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.