wagga wagga is upstream from the riverina plain in the mid-catchment range of the murrumbidgee river in an alluvial valley confined by low bedrock hills. much of wagga wagga is on heavy clay soils in a large drainage basin with a small catchment discharge point. groundwater therefore cannot leave easily, leading to wagga wagga having a problem with waterlogged soil and soil salination. urban salination in wagga wagga is now the subject of a large multi-pronged approach to prevent further salination and reclaim salt-affected areas.