Keep first-emitter offset in a specified dripline takeoff.
Does a run’s start coincide with an emitter position?
Use the matching calculator
Use this decision sequence
- Use run lengths and emitter pitch from the selected product and layout.
- Locate the first emitter relative to the start of each run.
- Count positions at that offset plus whole pitch intervals that still fit the run.
- Add headers and separate cut allowances to tubing length without treating them as emitted watering coverage.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Emitter pitch | A supplied product/layout parameter. |
| First offset | Changes positions at the run boundaries. |
| Header length | Tubing quantity, not another repeated emitter run. |
Worked comparison
An illustrative 4 m run with 1 m emitter pitch and first emitter 0.5 m from its start has positions at 0.5, 1.5, 2.5 and 3.5 m: four. Starting at zero would produce five positions including one at 4 m. Three runs with 0.5 m extra tube each plus a 2 m header require 15.5 m of tubing.
Check before using the estimate
No emitter rate, placement, pressure, irrigation demand or hydraulic sufficiency is selected.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.
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