Many of the waterways in the lowlands of the Murray-Darling Basin are rivers and creeks that are typified by having long and meandering channels that are underlain by a clogging clay layer of varying quality and thickness. It is the presence and thickness of these clay layers, along with depth to water table, which are the primary parameters in the determination of the rate loss from the watercourse to the underlying aquifer. Using an in-river resistivity survey, corroborated by along-shore VES and hand auger profiles, we have produced a geo-referenced recharge/loss map for a 2 km section of Billabong Creek near Jerilderie, NSW. We have shown that in-river resistivity surveys are a possible geophysical technique that can be used to estimate recharge rates and clay thickness along the river bed at a river reach scale. Maps such as the one produced here are useful for groundwater flow modelling, and may assist in the determination of water allocations in the future.


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