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Crop evapotranspiration is calculated using the single crop coefficient approach described in FAO56 (Equation 6). Crop coefficients at various growth stages can be modelled in Source as described in the Irrigation Demand Model Crop Factors SRG entry. Alternatively, Source also offers sufficient flexibility to apply daily crop factors if they are known for a particular crop based on a different source or method.
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| Parameter | Description | Unit | Default | Typical Range | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Yield | Water stress coefficient (Ks | % | 0 | 0-100 | ||||||||||
Expected Usage | Expected total irrigation requirement for crop for the growing season. This is used to evaluate expected surplus/shortfall of water availability | mm | 0 | 5-15 | ||||||||||
Productivity | Multiplier to convert yield into user specified output units | none |
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