Drip Irrigation
Emitter count, flow rate and water used per run.
About Drip Irrigation
Emitter count comes from row length and spacing, and flow times run minutes gives water used. Drip puts water exactly at the root zone, so matching rate to minutes is how over- and under-watering are avoided.
Formula
Drip Irrigation
Emitters = row length x 12 / spacing; flow = emitters x flow each
- gph
- Gallons per hour each emitter delivers
Worked example
With the default values below, Drip Irrigation returns Total Emitters of 100. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Beds / rowsminimum 1
- 2
- Row lengthminimum 1 ft
- 50 ft
- Emitter spacingminimum 1 in
- 12 in
- Emitter flowminimum 0.01 gph
- 0.5 gph
- Run timeminimum 0 min
- 30 min
Results
- Total Emitters
- 100
- System Flow
- 50.0 gph
- Water per Run
- 25.0 gal
Step by step
- 1Values used
- 2Drip Irrigation
- 3Total Emitters= 100
- 4System Flow= 50.0 gph
- 5Water per Run= 25.0 gal
Assumptions and limits
- The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Drip Irrigation calculated?
Emitters = row length x 12 / spacing; flow = emitters x flow each Emitter count comes from row length and spacing, and flow times run minutes gives water used.
Why does Drip Irrigation matter?
Drip puts water exactly at the root zone, so matching rate to minutes is how over- and under-watering are avoided.
What values do I need to enter?
This calculator takes 5 inputs: Beds / rows, Row length, Emitter spacing, Emitter flow, Run time. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.