20240820 17040400 1.0 ISO 19139 Metadata Implementation Specification GML3.2 FALSE 20241002 17293100 TRUE Watertable_RSWL_regional_trend_mAHD.lyr 005 20240920 17310900 5000000 5000 ISO19139 Watertable RSWL regional trend raster digital data <DIV STYLE="text-align:Left;"><DIV><DIV>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 mapping does 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. </DIV></DIV></DIV> This raster provides information on regional trends in watertable across the whole of the Kati Thanda - Lake Eyre Basin (KT-LEB) region. To provide coverage across the whole region, the regional watertable was constructed using waterlevel measurements from any near surface aquifer, not just aquifers in the Cenozoic. Reference datum is metres above the Australian Height Datum (mAHD). Most bores in the KT–LEB have only a single water level reading, which generally was measured soon after the bore was constructed. Hence, the composite water level mapping does not represent a particular point in time. In addition, waterlevel measurements that were used to create the surface were not density corrected due to many bores missing salinity data. Despite some local limitations such as this, the watertable trend and depth to water mapping is generally consistent at the basin scale, and correlates strongly with the regional topography. Evans et al. (2024) details the hydrogeology of the KT-LEB region. Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595 National Groundwater Systems hydrogeology groundwater Cenozoic sedimentary cover Kati Thanda - Lake Eyre Basin bores regional watertable Lake Eyre geological Basin Marion-Noranside Basin Austral Downs Basin Tirari Sub-basin Callabonna Sub-basin Cooper Creek Palaeovalley © 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 West 135.227676 East 141.847823 North -23.211198 South -32.098907 131.35250000000 EAST LONGITUDE 146.75500000000 SOUTH LATITUDE -34.32794000000 NORTH LATITUDE -18.81250000000 1 131.35250 146.75500 -34.32794 -18.81250 1 4283 GCS_GDA_1994 <DIV STYLE="text-align:Left;font-size:12pt">© 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</DIV> 20241002 ArcGIS Pro Layer file 3.2.2 dataset 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). Watertable trend raster was interpolated using ArcGIS software suite Topo to Raster tool and watertable observation points compiled for bores and springs in meters above AHD. Flowing spring location points were sampled with elevation values from SRTM-1sec DEM (Wilson et al. 2011) and were added 1m to represent hydraulic head of the local watertable. NSW Government (2023) NSW groundwater bore database [data set], NSW Department of Primary Industries and Environment, https://water.dpie.nsw.gov.au/science-data-and-modelling/groundwater-management-and-science, accessed 1 May 2023. NT Government (2023) NT bore locations, water quality and groundwater levels [data set], NT Open Data Portal, https://data.nt.gov.au/dataset/nt-bore-locations-water-quality-and-groundwater-levels, accessed 1 May 2023. Queensland Government (2023) Queensland groundwater bore database [data set], Queensland Open Data Portal, https://www.data.qld.gov.au/dataset/groundwater-database-queensland, accessed 1 May 2023. SA Government (2023) South Australian groundwater bore database [data set], WaterConnect, South Australian Government Environmental Data, https://www.waterconnect.sa.gov.au/Systems/GD/Pages/Default.aspx, accessed 1 May 2023. 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