Plan irrigation needs for the proposed crop season.
Inputs, example and sources
Food and Agriculture Organization of the United Nations · FAO Irrigation and Drainage Paper 56 Crop Evapotranspiration
Institution publication · Chapter 5, Crop coefficient approach, equation 56
This verifies the ETc component only. Local water-balance allowances, coefficients and operating decisions still need confirmation.
Keep the same place, observation period, definitions, units and source versions.
Analysis inputs. Irrigated crop area [ha]; Reference evapotranspiration [mm/day]; Crop coefficient [ratio]; Rainfall reaching the field after runoff [mm/day]; Deep percolation and paddy allowance [mm/day]; Capillary contribution [mm/day]; Desired change in stored soil water [mm/day]; Field application efficiency [fraction]
Other required evidence. Crop stages; evapotranspiration; rainfall; soil storage; percolation; field efficiency.
Fictional worked example · 2025
Laggala Pallegama — irrigation planning · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Irrigated crop area | 85 | ha |
| Reference evapotranspiration | 4.5 | mm/day |
| Crop coefficient | 1.1 | ratio |
| Rainfall reaching the field after runoff | 1.6 | mm/day |
| Deep percolation and paddy allowance | 2 | mm/day |
| Capillary contribution | 0 | mm/day |
| Desired change in stored soil water | 0 | mm/day |
| Field application efficiency | 0.68 | fraction |
| Gross daily irrigation requirement | 6,687.5 | m³/day |
|---|
| Net field requirement | 5.35 | mm/day |
|---|
The full local balance, rooting depth, stress, crop stage and operating constraints still matter. The paddy allowance is explicit and must be zero where inapplicable. This is not an authorized reservoir release.
Proposed checking role. Farmer with qualified agriculture/water/finance adviser for the decision.
After the action. Delivered water, crop stress, unmet demand and downstream conditions.
- FAO 56: crop evapotranspiration — Institution publication. FAO 56 Chapter 5 equation 56; ETc = Kc × ETo. Institutional context; does not establish the calculation or local approval.
- FAO56 root-zone water balance — Institution publication. Chapter8 equation85 and ETc = Kc ETo. Daily water balance components; local coefficients and operating assumptions still need review.
- FAO Irrigation Water Management Training Manual 3 — Institution publication. Chapter 4.4 Irrigation water need of rice; steps 1 to 8. Institutional context; does not establish the calculation or local approval.
- SHARED domain decision contracts — Validation required. Domain decision rules and matching fictional examples. Local comparisons, constraints, source matching, sorting and follow-up proposals; developer checks do not establish scientific or client approval.
Institution and data context
Confirm local scope, data rights, parameters and responsible roles in this Institution review. Published components retain their source; they do not approve the local application.