Calculator Inputs
Use either the Rated method or the K–X model for custom emitters.
Example Data
A quick reference example for typical garden drip settings.
| Scenario | Rated Flow | Rated Pressure | Operating Pressure | Emitters | Total Flow (L/h) | Daily (L) |
|---|---|---|---|---|---|---|
| Vegetable bed zone | 2 L/h | 1 bar | 1 bar | 160 | 320 | 480 (1.5 h/day) |
| Orchard ring emitters | 4 L/h | 1 bar | 1.2 bar | 80 | ≈ 350 (x=0.50) | ≈ 700 (2 h/day) |
| Pressure‑compensating dripline | 2 L/h | 1 bar | 1.8 bar | 200 | 400 (x=0.00) | 600 (1.5 h/day) |
Example values are illustrative. Always verify manufacturer charts for your exact emitter model.
Formula Used
Most emitters follow a power‑law relationship between pressure and discharge.
The calculator uses the standard emitter discharge model: q = k · Px
- q = emitter flow (L/h)
- P = pressure at the emitter (bar)
- k = coefficient based on the emitter design
- x = exponent that describes sensitivity to pressure
If you use the Rated method, the tool derives k from the rated flow and rated pressure: k = qrated / Pratedx.
How to Use This Calculator
Follow these steps to plan zone flow and watering volume.
- Select a pressure unit that matches your gauge.
- Choose Rated flow for labeled emitters, or K–X for custom data.
- Enter operating pressure at the emitter location.
- Set emitters per line and number of lines to get total flow.
- Optional: add a pressure range to see min/max discharge variation.
- Press Calculate. Download CSV/PDF for records or sharing.
Tip: If your emitters are pressure‑compensating, set x = 0.00. Then flow stays nearly constant across pressure changes within the rated range.