Résumé :
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Recent estimates indicate that one-half of the existing irrigation areas around the world have shallow water tables, and require careful water management practices to prevent reduced productivity due to waterlogging and secondary salinisation. Hydrologic processes affecting shallow water tables occur continuously in both the saturated and unsaturated soil phases, and are influenced by climate agronomy and hydrogeology. We have developed a soil, water and groundwater SIMulation model (SWAGSIM) that aims to facilitate evaluation of shallow water table management options with minimal data and computing requirements. It is optimised for the Microsoft Windows operating system. In this paper, we describe the processes modelled within SWAGSIM, and its availability to potential users. SWAGSIM has been successfully used to determine the impact of rice growing in the Murrumbidgee Irrigation Area (MIA) of New South Wales, to evaluate the feasibility of using shallow groundwater pumps to control water tables in the MIA, to evaluate subsurface drainage options for the Mead Ridge project area in Victoria, and to evaluate groundwater discharge into the Hunter River of New South Wales.
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