Name: WatertableRSWLRegionalTrendContours_50m

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Description: The watertable contours are derived from the regional watertable trend surface and reference m(AHD). The regional watertable trend surface for the KT-LEB is derived from interpolation of water level data available for the shallowest aquifers intersected across the entire KT-LEB region (Evans et al. 2024).While most of the water level data are sourced from bores screened in Cenozoic sediment aquifers, additional water level data from near-surface aquifers in older pre-Cenozoic rocks and sediments (to maximum depths of 100 m below surface) were also included in the analysis. This approach enabled broader regional understanding of groundwater level trends across the entire basin in places where Cenozoic aquifers do not occur. The water level data was obtained from the state and territory groundwater bore databases. Sources of archival groundwater bore data evaluated for the KT–LEB included Queensland Government (2023), NT Government (2023), SA Government (2023) and NSW Government (2023).In some places, the regional watertable surface may not represent the local watertable in the unconfined aquifer, particularly where the shallowest aquifer may be semi-confined. The water level data used to create these maps were not corrected for variations in water density due to the regional scale nature of the assessment, the lack of bores with co-located salinity and water level data, and the highly variable groundwater salinity in many Cenozoic aquifer (Evans et al. 2024). Developing local-scale water level maps, particularly in areas of highly saline groundwater, would require data to be corrected for variations in water density. Such areas include near salt lakes such as lakes Eyre and Frome, or areas where groundwater salinity varies considerably across short distances such as on the Strzelecki Sandplain to the west of Strzelecki Creek.The watertable regional trend surface and associated contours do not account for perched aquifers that may occur in some places above the level of the regional watertable. Perched aquifers can be locally important water sources for wetlands and GDEs, although they are generally of limited areal extent.Most bores screened in Cenozoic aquifers in the KT–LEB have only a single water level reading. These readings are generally measured soon after the bore was constructed. Hence, the composite water level mapping does not represent a particular point in time. Despite some of the limitations, the watertable regional trend surface, contours and depth to standing water level water mapping is consistent at the basin scale and demonstrates that shape of watertable correlates strongly with the regional topographic features such as catchment boundaries.

Copyright Text: © Commonwealth of Australia (Geoscience Australia) 2026. This product is released under the Creative Commons Attribution 4.0 International Licence. http://creativecommons.org/licenses/by/4.0/legalcode

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