Drip Irrigation Calculator
A drip system is sized by the total water it must deliver. Enter the rows, the spacing of the emitters along them and the flow of each one, and this totals the emitters and the flow your supply must meet.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Each row needs one emitter every spacing distance, so the count per row is the row length divided by the spacing, rounded up. Multiply by the number of rows for the total.
Total flow is the emitter count times the flow of one emitter. Your water supply and pressure must be able to deliver that much at once.
Worked example
3 rows of 300 ft with an emitter every 12 in need 900 emitters, which together flow 900 gallons an hour.
Questions
What flow does an emitter give?
Common drip emitters are rated near one gallon an hour, but check the rating on your product. Pressure changes the real flow.
Why round the count up?
The last spot in a row still needs an emitter. Rounding up keeps every plant watered.
Does this size the pump or the pipe?
No, it gives only the total flow. Pipe size and pump need a separate check against the pressure your supply makes.
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