20240820 17041400 1.0 ISO 19139 Metadata Implementation Specification GML3.2 FALSE 20241001 19425200 TRUE Watertable_RSWL_regional_trend_mAHD_contours.lyr 005 20240925 17433400 5000000 5000 ISO19139 Watertable RSWL regional trend contours vector digital data Geoscience Australia client services GPO Box 378 Canberra ACT 2601 clientservices@ga.gov.au AU +61 2 6249 9111 client services <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>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. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>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)</SPAN><SPAN>,</SPAN><SPAN> SA Government (2023) and NSW Government (2023).</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>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. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>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.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>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.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>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. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>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. </SPAN></P><P /></DIV></DIV></DIV> Reduced standing water level (RSWL) contour lines representing regional watertable. These contours are derived from the watertable trend surface and reference m(AHD). Reference datum is metres above the Australian Height Datum (mAHD). The contour spacing are 50m intervals except where watertable height is below 50m AHD. Below 50m AHD, extra contours are included (0, 10 and 25m AHD) to improve definition of regional low point in groundwater elevation (a groundwater sink) that is associated with some large salt lakes (such as around Kati Thanda - Lake Eyre and Lake Frome). These contours provide information on regional trends in watertable across the whole of the Kati Thanda - Lake Eyre Basin (KT-LEB) region. Evans et al. (2024) details the hydrogeology of the KT-LEB region. So as 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. 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. © 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 Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595 National Groundwater Systems hydrogeology bores groundwater water levels springs Cenozoic sedimentary cover Kati Thanda - Lake Eyre Basin 133.677688 145.787353 -32.666791 -21.061690 West 133.677688 East 145.787353 North -21.061690 South -32.666791 1 4283 GCS_GDA_1994 <DIV STYLE="text-align:Left;font-size:12pt"><P><SPAN>© Commonwealth of Australia (Geoscience Australia) 2026. 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The contour spacing are mostly at 50m intervals except where watertable height is below 50m AHD. Below 50m AHD, extra contours are included (0, 10 and 25m AHD). The contour line dataset was produced in ArcGIS software using contour list tool. The output contour dataset had small segments filtered and smoothed lines with smoothing length tolerance of 1km. 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). 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.