Start / Water and irrigation / Irrigation management and depth
Enter the depth per irrigation, the operating hours per day, and the area to find out the flow the system must deliver.
Pre-sizing and estimating tool: the results do not replace a design, calculation, or report signed by a qualified professional, nor verification against the applicable standards.
How much the flow per hectare rises when the same depth must enter in fewer hours; the dot marks your operation.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Flow per hectare for depths and irrigation hours close to yours. The highlighted row is your depth, when it is in the table.
The calculation done in steps, with the values you entered.
The calculation memo gathers this page's inputs, results, equations, assumptions, and references, with fields for project, responsible person, and review. The full report also includes the charts and interpretations, in color. In the print window, choose Save as PDF.
Enter the gross depth to be applied at each irrigation, the system's operating hours per day, and the irrigated area. The calculator returns the specific flow in L/s per hectare, the total system flow in L/s and m³/h, and the water volume for the day.
Gross depth of 6 mm, 12 hours of operation per day, and 10 ha.
Specific flow = 6 × 2.7778 ÷ 12 = 1.39 L/s/ha. Total flow = 1.39 × 10 = 13.9 L/s, or 50 m³/h. Daily volume = 6 × 10 × 10 = 600 m³.
| Gross depth | Hours per day | Specific flow |
|---|---|---|
| 6 mm | 12 h | 1.39 L/s/ha |
| 6 mm | 20 h | 0.83 L/s/ha |
| 10 mm | 12 h | 2.31 L/s/ha |
| 10 mm | 20 h | 1.39 L/s/ha |
To choose the depth and time, use the irrigation interval and depth. For the pump head, check the irrigation cost in irrigation cost per bag.
It is the system flow needed per hectare, in L/s per hectare. It allows comparing systems and sizing the pump for any area.
Because the same water depth must enter the area in less time. Half the time doubles the required flow.
1 mm over 1 hectare is 10 m³, or 10,000 litres. That is why the conversion between depth and volume is so direct.
The depth for the irrigation interval, which depends on crop evapotranspiration and the soil's water-holding capacity, already corrected for system efficiency.
Important notice: the Agrocalcs tools make estimates and preliminary sizing based on the data entered and on published engineering methods. They do not replace a design, a calculation report or a report signed by a qualified professional (CREA/ART), nor verification against the applicable technical standards and legislation, such as the Regulatory Standards of the Ministry of Labor. Material and fuel properties vary: check with the manufacturer or with analyses of your process before deciding. By using the site, you agree to the Terms of Use.
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