20240927 14374000 1.0 ISO 19139 Metadata Implementation Specification GML3.2 FALSE 20240927 14552000 TRUE Watertable_RSWL_mAHD_contours.lyr 005 20240927 14440600 625000 5000 ISO19139 Watertable RSWL contours external 3bffef6799cf6f03264126ed047e91a Geoscience Australia client services GPO Box 378 Canberra ACT 2601 clientservices@ga.gov.au AU +61 2 6249 9111 True client services <DIV STYLE="text-align:Left;"><DIV><DIV><P><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).</SPAN><SPAN /></P><P><SPAN>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><SPAN /></P><P><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); 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. </SPAN></P><P><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><SPAN /></P><P><SPAN /><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><SPAN /></P><P><SPAN /><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><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></DIV></DIV></DIV> Reduced standing water level (RSWL) contour lines representing regional watertable at 25m intervals. These contours are derived from the watertable trend surface and reference metres above the Australian Height Datum (mAHD). The contour spacing are 25m intervals except where watertable height is below 25m AHD. Below 25m AHD, extra contours are included (0 and 10m 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 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 133.677690 146.117812 -32.666507 19.122906 1 4283 GCS_GDA_1994 <DIV STYLE="text-align:Left;font-size:12pt"><P><SPAN>© 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</SPAN></P></DIV> 20240927 ArcGIS Pro Layer file 3.2.2 dataset Reduced standing water level (RSWL) contour lines representing regional watertable at 25m intervals. 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 25m intervals except where watertable height is below 25m AHD. Below 25m AHD, extra contours are included (0 and 10m AHD). The contour line dataset was produced in ArcGIS software using Spatial Analyst contour list tool (0, 10, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300). The output contour dataset had small segments filtered and smoothed lines with smoothing length tolerance of 1km. 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. /9j/4AAQSkZJRgABAQEAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0a HBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIy MjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCACFAMgDASIA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK U1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3 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