Models Calibration Validation and Inter Model Comparisons

Since SWAP simulates the soil-water balance; the model outputs include deep drainage, capillary rising and runoff also. The model itself can provide irrigation recommendations, based on the simulated soil water contents and crop evapotranspiration. All these capabilities can be used at the field level to integrate a general farm water-management, trying to help farmers to control water more efficiently and to improve the environmental and economic performance of irrigation systems. SWAP is specifically oriented to water management, but comprises the WOFOST also, which make SWAP able to simulate crop-growth as well. Nevertheless, SWAP simulation outputs should be compared to other similar modelling approach. As shown by Eitzinger et al. (2004); Tardieu (2005) and others, several model approaches can yield the same results. Particularly, DSSAT models have been used for irrigation and crop water-use assessments in Spain (GuereƱa et al., 2001; Villalobos and Fereres, 2004) and overseas (Hoogenboom, 2000). Therefore, a prior model comparison should be made before selecting the model that can be used to irrigation decision-making. Such comparison should include, at least, some internationally used model as those of DSSAT, based on the "Cascade approach"; as well as an agrohydrological model.

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