20240820 17045900 1.0 ISO 19139 Metadata Implementation Specification GML3.2 FALSE 20240925 12034500 TRUE LEB hydrochemistry zones.lyr 005 20240924 18303800 625000 5000 ISO19139 vector digital data Geoscience Australia client services GPO Box 378 Canberra ACT 2601 clientservices@ga.gov.au AU +61 2 6249 9111 client services Lake Eyre Basin hydrochemistry zones <DIV STYLE="text-align:Left;"><DIV><DIV>This dataset subdivides the spatial extent of the Kati Thanda - Lake Eyre Basin (KT-LEB) project region based on modified drainage division. The major ion compositions and groundwater types for hydrochemical samples for groundwater bores in the KT-LEB region are discussed in detail in Evans et al. (2024).The LEB hydrochemistry zones dataset is derived from the modified boundaries of the Bureau of Meteorology (2022) River Regions, Australian Surface Water Management areas (ASWMA 2005), based on 1997 Drainage basin dataset, and Queensland Drainage basin sub areas (Department of Resources,2021). Details regarding the sources and data attribution for KT - LEB Project boundaries dataset (Geoscience Australia, 2024) are outlined in further detail in the metadata relevant to that dataset.</DIV></DIV></DIV> This dataset subdivides the spatial extent of the Kati Thanda - Lake Eyre Basin (KT-LEB) project region based on modified drainage division. Assessment of hydrochemical sample data by region assists in defining groundwater type distribution patterns and identifying groundwater evolution trends and processes. The major ion compositions and groundwater types for hydrochemical samples for groundwater bores in the KT-LEB region are discussed in detail in Evans et al. (2024). © 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 groundwater Cenozoic sedimentary cover Kati Thanda - Lake Eyre Basin bores hydrochemistry drainage basin Diamantina Cooper Todd-Hay Eyre-Frome Western 1 4283 GCS_GDA_1994 1 131.352500 146.755000 -33.247500 -18.812500 <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> 20240925 ArcGIS Pro Layer file 3.2.2 dataset The LEB hydrochemistry zones dataset was created by modifying the Project boundaries and extents group File Geodatabase Features Class dataset. Modifications were based on the AWRA drainage division vector data source (Bureau of Meteorology, 2022) and Drainage basin sub areas – Queensland vector data source (Department of Resources, 2021) that also took into consideration the spatial distribution of hydrochemical sample data. Drainage subdivisions were grouped and merged to best optimise visulisation of hydrochemical sample data and remove state boundaries. The merged vector polygons were then converted into vector polylines using the ArcGIS Polygon to Line Data Management tool before the derived polylines were smoothed using the ArcGIS SmoothLine Cartography tool applying the "Polynomial Approximation with Exponential Kernel (PAEK) smoothing algorithm with a smoothing tolerance of 0.02 decimal degrees. The smoothed polyline features were then used to cut a copy of the source Project boundaries and extents File Geodatabase Feature Class dataset to create the final LEB hydrochemistry zones File Geodatabase Feature Class dataset. Bureau of Meteorology (2015) Australian Hydrological Geospatial Fabric (Geofabric) Product Guide Version 3 – 2015, Commonwealth of Australia (Bureau of Meteorology), Canberra, http://www.bom.gov.au/water/geofabric/documents/v3_0/ahgf_productguide_V3_0_release.pdf Bureau of Meteorology (2022) AWRA drainage division vector data source, Commonwealth of Australia (Bureau of Meteorology), Canberra https://hosting.wsapi.cloud.bom.gov.au/arcgis/rest/services/ahgf/Geofabric_V3x_All_Products/MapServer Department of Resources (2021) Drainage basin sub areas – Queensland, State of Queensland (Department of Resources) 2021. 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