Abstract
The prediction of the position of the water table in low-lying polder areas is presented based on the drainage resistance approach of Ernst (Thesis University of Utrecht, 1954), but extended to consider the case of sub-irrigation by capillary rise from a water table. Variation in water table position with time is modelled using a succession of steady states and estimates of the flux through the water table are made using the model (SWATRE) of Belmans et al. (J. Hydrol., 63: 271–286). Good agreement is shown between measured data from a low lying riverine site in Poland and the model. The greatest differences between predicted and actual values of water table position occur when rapid fluctuations in the flux through the water table occur. It is suggested that the flow resistance approach may be used as a sub-routine for water table movement in any model in which flux through the water table is described. Used with such models it forms the basis of a management tool for water control in ditches and canals in areas where sub-irrigation is practised.
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