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Irrigation & Water
Use Calculator Irrigation Water Requirement Calculator
Estimate net and gross irrigation depth and total water volume after rainfall and system-efficiency adjustments.
Irrigation & Water Calculators
Rainwater Harvesting Calculator
Estimate recoverable rainwater from catchment area, rainfall, runoff coefficient and storage losses.
Free agriculture calculator
No signup requiredRainwater Harvesting Calculator
Your results
How to use the Rainwater Harvesting Calculator
- Enter the requested field, crop, animal, equipment, or cost information.
- Keep every value in the unit shown beside its field.
- Select Calculate and review each result and assumption.
- Verify important decisions with local records, labels, extension guidance, or a qualified adviser.
Formula and method
Harvested litres = catchment area (m²) × rainfall (mm) × runoff coefficient × (1 − loss fraction).
One millimetre of rain on one square metre equals one litre before runoff and storage losses.
Worked example
A 500 m² roof receiving 50 mm with 0.85 runoff and 5% loss can collect about 20,188 L.
Understanding the result
Treat the calculated values as a planning estimate. Compare them with your field records, product information, local conditions and operational capacity before acting.
Important: Results depend on the accuracy of your inputs and the assumptions shown. Local soil, weather, crop, animal and market conditions can change the appropriate decision.
Frequently asked questions
What does the Rainwater Harvesting Calculator calculate?
Estimate recoverable rainwater from catchment area, rainfall, runoff coefficient and storage losses.
How accurate is this calculator?
The arithmetic follows the formula shown, but the practical accuracy depends on your measurements, assumptions and local conditions.
Can I use the result for a final farm decision?
Use it for planning and comparison. Verify high-impact crop, chemical, engineering, financial or animal decisions with current local guidance and qualified advice.
Does BlogAgri store my calculator inputs?
No. The calculator runs in your browser and does not submit the entered values to BlogAgri.
