Irrigation Water Volume
Calculator
Results
- Net water volume (m³)
- 1,000
- Gross water volume (m³)
- 1,250
- Gross irrigation depth (mm)
- 31.25
- Water volume (L)
- 1,250,000
Farming results
| Net water volume (m³) | 1,000 |
| Gross water volume (m³) | 1,250 |
| Gross irrigation depth (mm) | 31.25 |
| Water volume (L) | 1,250,000 |
formula-map diagram
- Net water volume (m³)
- 1,000
- Gross water volume (m³)
- 1,250
- Gross irrigation depth (mm)
- 31.25
- Water volume (L)
- 1,250,000
Formula map
Formula
Volume (m³) = area (ha) × depth (mm) × 10 ÷ efficiency= 1000
Note
Simplified agronomic model: results use the rates, grades and coefficients you enter and ignore soil type, weather, variety and local regulations. Confirm with a soil test, the product label and an agronomist before applying anything.
More in Farming and crops
See all →Frequently asked questions
What does 'irrigation water volume' actually represent?+
It is the total quantity of water needed to apply a given depth of irrigation over your field area, typically expressed in cubic meters or liters. It answers 'how much water' rather than 'how long to run the system,' which depends additionally on flow rate.
Why does the same water depth require different volumes on different field sizes?+
Volume scales directly with area — applying 25 mm of water over 1 hectare takes exactly ten times less water than applying the same depth over 10 hectares. The depth stays constant per crop need, but total volume always depends on the area irrigated.
Does this account for irrigation system efficiency?+
Only if you include an efficiency factor — the theoretical crop water need must be divided by your system's application efficiency (typically 60-90% depending on the method) to find the actual volume you need to pump, since some water is always lost to evaporation, wind drift, or deep percolation.
How do I know what depth of water to apply?+
Depth is usually set by crop water need (from evapotranspiration data) minus effective rainfall, adjusted for the water-holding capacity of your soil. Applying more than the soil can hold wastes water through runoff or drainage below the root zone.
Can I use this figure to size a pond or well?+
It gives you the volume needed per irrigation event, but sizing a water source requires totaling this across the full season and accounting for peak demand periods, since a source that can supply the seasonal average may still fall short during the crop's highest-demand weeks.