This calibration tool is designed to meet the IrrigationNZ: NZ Irrigation System Performance Assessment Code of Practice – Part H: Centre Pivot. Download the code for more guidance. For a more comprehensive assessment, see the Centre Pivot Evaluation tool.
NOTE: IRRIG8 does not store your data or keep any records. Leaving or refreshing this page will delete all your data, so print reports and export the data or graphs if you want to save them. To have a copy you can reload and edit, download the Save Session csv file and save it. This tool lets you upload it again to automatically repopulate all your data.
Beta version: See disclaimer at foot of page
🌾 Centre Pivot Quick Check v1.0.0
Calibration check following the IrrigationNZ Code of Practice Part H, Section 2
Save everything entered on all tabs, plus the results, to a CSV file on your computer. Load it later to fill the tool back in and recalculate.
24 containers with the same known opening (over 150 mm; 9 litre buckets work well) in a line across the path of the machine: 12 evenly from 1/5 to 2/3 of the machine length, 10 evenly from 2/3 to the end wheels, and 2 between the end wheel track and the edge of significant wetting (end gun or end span). Avoid the wheel tracks and the very end, where application drops away.
Set Out Collectors fills in suggested distances. Replace them with the actual distances if they differ. Record each volume against the correct position.
Put two flags along the line of travel near the end tower, at least 5 m either side of the collector line and visible from outside the wetted area. Time the machine between the flags, including any stops.
What is calculated
- Irrigator speed and time for a full circle
- Applied depth, overall and for the inner, outer and end gun collectors
- Distribution uniformity and the excess water use factor
- Application intensity, and flow worked out from the collectors
- The speed or timer setting to apply your target depth to 7/8 of the area