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The paper describes the approaches used to consider the capillary rise from the groundwater in a water balance model. Using field experiments, it was observed and then simulated with a deterministic flux model the relationships between upwards flux, water-table depth, soil water storage and crop evapotranspiration. Simplified computation algorithms were developed and adopted in the simulation model ISAREG. Similarly, a computational algorithm to estimate the daily deep percolation after excessive soil wetting by rain or irrigation was also added to the model. Results comparing field observations and simulated data show an important improvement in the accuracy of the model for conditions in North China.