When to use this calculator
Convert sprinkler flow and coverage area into an average application rate. Assumes uniform coverage with no overlap, runoff, evaporation or wind loss.
Explore the irrigation & applied water calculators for other questions in this topic. For a related calculation, use the Compost Spread Volume Calculator: Estimate compost volume for an even layer over a measured area.
PUTTING IT INTO PRACTICE
Sprinkler Precipitation Rate: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Delivered flow (L/min) | 10 |
| Covered area (m²) | 100 |
| Result | 6 mm/hour |
- Check the input labels and enter the example values above.
- Apply the relationship: Application rate = flow × 60/covered area.
- The result is 6 mm/hour, rounded for display.
How to interpret your result
Assumes uniform coverage with no overlap, runoff, evaporation or wind loss.
A water-budget conversion does not establish the crop’s requirement. Use measured flow and effective rainfall where possible. Distribution losses and runoff can make gross application differ from water retained in the root zone.
Frequently asked questions
Does one millimetre of rain equal one litre?
It equals one litre over each square metre of collection area. Total volume therefore depends on both depth and area.
When is the sprinkler precipitation rate calculator useful?
Convert sprinkler flow and coverage area into an average application rate. Assumes uniform coverage with no overlap, runoff, evaporation or wind loss.
How do I use the sprinkler precipitation rate calculator?
Enter delivered flow (l/min), covered area (m²). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Application rate = flow × 60/covered area.
What should I check before using the result?
Assumes uniform coverage with no overlap, runoff, evaporation or wind loss.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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