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Catchment Salt and Water Balance Effects of Irrigation with Groundwater in Rainfed Areas

The Management of Catchment Salinisation (MCS) modelling approach has been described in earlier work (Daamen & Hoxley, 2003). It links a one-dimensional soil water model with a groundwater model to investigate the effects of management options in study areas of approximately 50 km2. The one dimensional model is used to characterise the annual soil water balance as a function of underlying aquifer potential for all required combinations of soil, vegetation and groundwater salinity. It includes the effect of salt accumulation on plant water use. A groundwater model is then used to estimate the depth to watertable across the study area that reflects the topography, hydrogeology and the distribution of vegetation.