Agriculture Irrigation Water Requirement

Balance caller interval crop demand with already-effective rainfall and planned available soil-storage draw, then convert to gross irrigation by supplied efficiency; no storage draw beyond caller availability or irrigation scheduling recommendation.

Description

An interval irrigation budget subtracts effective rain and planned available soil-water draw from crop demand.

An interval irrigation budget subtracts effective rain and planned available soil-water draw from crop demand. Application efficiency then converts net required water into gross delivery.^[1]

When to use Agriculture Irrigation Water Requirement

Use this tool to balance caller interval crop demand with already-effective rainfall and planned available soil-storage draw, then convert to gross irrigation by supplied efficiency; no storage draw beyond caller availability or irrigation scheduling recommendation.

Prepare the field, crop, soil or material measurements for the intended period. Confirm units, dry/wet bases and supplied parameters; keep paired observations aligned.

How to use Agriculture Irrigation Water Requirement and understand its results

Prepare the field, crop, soil or material measurements for the intended period. Confirm units, dry/wet bases and supplied parameters; keep paired observations aligned.
Enter intervalCropWaterDemandsMm, effectiveRainfallMm, plannedAvailableStorageDrawMm, applicationEfficiencies, fieldAreaHa using the field table and calculation rules, then run the tool.
Read netIrrigationRequirementsMm, grossIrrigationDepthsMm, totalGrossIrrigationVolumeM3. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
intervalCropWaterDemandsMm	Interval crop water demands mm	list of number	Required
effectiveRainfallMm	Effective rainfall mm	list of number	Required
plannedAvailableStorageDrawMm	Planned available storage draw mm	list of number	Required
applicationEfficiencies	Application efficiencies	list of number	Required
fieldAreaHa	Field area ha	number	Required

Pair nonnegative demand, already-effective rainfall and available storage-draw mm with efficiencies greater than zero and at most one. Enter nonnegative field hectares. Return net and gross depths per interval and total gross m³ as 10×hectares×sum gross mm.

Paired lists must be nonempty and have equal lengths.

netMm_i = max(0,demand_i−effectiveRain_i−storageDraw_i); grossMm_i = netMm_i/efficiency_i

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
netIrrigationRequirementsMm	Net irrigation requirements mm	list of number
grossIrrigationDepthsMm	Gross irrigation depths mm	list of number
totalGrossIrrigationVolumeM3	Total gross irrigation volume m3	number

json

{
  "input": {
    "intervalCropWaterDemandsMm": [
      20,
      30
    ],
    "effectiveRainfallMm": [
      10,
      5
    ],
    "plannedAvailableStorageDrawMm": [
      5,
      0
    ],
    "applicationEfficiencies": [
      0.5,
      1
    ],
    "fieldAreaHa": 2
  },
  "output": {
    "netIrrigationRequirementsMm": [
      5,
      25
    ],
    "grossIrrigationDepthsMm": [
      10,
      25
    ],
    "totalGrossIrrigationVolumeM3": 700
  }
}

Limitations and assumptions

Rain effectiveness and available storage draw are supplied rather than calculated or tracked sequentially. The tool does not prevent repeated use of the same storage across intervals or choose an irrigation schedule.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Agriculture Crop Evapotranspiration: Integrate reference ET×caller crop coefficients across unequal stage durations, keeping modeled daily rates; no mutable crop calendar or universal Kc lookup. For a complementary task, use Agriculture Irrigation Efficiency: Audit independently measured applied/storage/runoff/drainage water balance, leaving unaccounted water explicit rather than calling all loss evaporation; not a uniformity or pump efficiency alias.

References

Agriculture Irrigation Water Requirement — tool.io

Similar or alternative tools

Agriculture Crop Evapotranspiration
Integrate reference ET×caller crop coefficients across unequal stage durations, keeping modeled daily rates; no mutable crop calendar or universal Kc lookup.
Agriculture Irrigation Efficiency
Audit independently measured applied/storage/runoff/drainage water balance, leaving unaccounted water explicit rather than calling all loss evaporation; not a uniformity or pump efficiency alias.