Geofabric Groundwater Cartography - V2.1.1Data format(s): ESRI File Geodatabase Coordinate system: 4283, GCS_GDA_1994 Location(s): http://www.bom.gov.au/water/geofabric/download.shtml Abstract: The Geofabric Groundwater Cartography product is a first pass national groundwater dataset bringing together existing groundwater mapping by collating and integrating the 'best' available, Commonwealth, state and regional groundwater mapping datasets across Australia. Although there are gaps in the information every effort has been made to reduce or minimise inconsistencies and conflicts in overlapping and abutting data sets and in attribution and definitions of the input data sets. In generating the various national aquifer datasets an interim national groundwater framework has been developed to relate geological units and regional and state groundwater aquifer mapping units to a nationally consistent set of aquifers and aquitards. The purpose of this framework is to provide a transparent mapping of aquifers from geological units, state or regional groundwater aquifer mapping (where available) and the interim national product. Such an approach was necessary to resolve inconsistencies in aquifer naming and definition across State borders. This product contains five Geofabric feature types including: Aquifer Boundary, Aquifer Outcrop, Contour, Water Table Aquifer and Surficial Hydrogeology Unit). It also contains five Interim Groundwater (IGW) feature types including: IGW Aquifer Salinity, IGW Aquifer Yield, IGW Water Table Salinity, IGW Water Table Yield and Water Table Hydraulic Conductivity. |
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The Geofabric Groundwater Cartography product is a first pass national groundwater dataset bringing together existing groundwater mapping by collating and integrating the 'best' available, Commonwealth, state and regional groundwater mapping datasets across Australia. Although there are gaps in the information every effort has been made to reduce or minimise inconsistencies and conflicts in overlapping and abutting data sets and in attribution and definitions of the input data sets. In generating the various national aquifer datasets an interim national groundwater framework has been developed to relate geological units and regional and state groundwater aquifer mapping units to a nationally consistent set of aquifers and aquitards. The purpose of this framework is to provide a transparent mapping of aquifers from geological units, state or regional groundwater aquifer mapping (where available) and the interim national product. Such an approach was necessary to resolve inconsistencies in aquifer naming and definition across State borders. This product contains five Geofabric feature types including: Aquifer Boundary, Aquifer Outcrop, Contour, Water Table Aquifer and Surficial Hydrogeology Unit). It also contains five Interim Groundwater (IGW) feature types including: IGW Aquifer Salinity, IGW Aquifer Yield, IGW Water Table Salinity, IGW Water Table Yield and Water Table Hydraulic Conductivity.
The Geofabric Groundwater Cartography has been developed to collate and integrate state and regional groundwater mapping datasets across Australia. Although there are gaps in information every effort has been made to reduce or minimise inconsistencies and conflicts in overlapping and abutting data sets and in attribution and definitions of the input data sets. The data set is intended to be used at the regional to national scale and does not support local scale groundwater conceptualisation and modelling and has not incorporated local and regional groundwater modelling data. The Geofabric Groundwater Cartography has been generated from available groundwater mapping data from the various jurisdictions. Given the interim nature of the Geofabric Groundwater Cartography, no groundwater borehole data was collated or reviewed in its generation. In generating the various national aquifer datasets an interim national groundwater framework has been developed to relate geological units and regional and state groundwater aquifer mapping units to a nationally consistent set of aquifers and aquitards. The purpose of this framework is to provide a transparent mapping of aquifers from geological units, state or regional groundwater aquifer mapping (where available) and the interim national product. Such an approach was necessary to resolve inconsistencies in aquifer naming and definition across State borders.
Sinclair Knight Merz (SKM)
Bureau of Rural Sciences, Canberra
Department of Environment and Resource Management, Queensland
Department of Natural Resources, Environment and The Arts, Northern Territory
Department of Primary Industry, Parks, Water and Environment, Tasmania
Department of Sustainability and Environment, Victoria
Department of Water, Land and Biodiversity Conservation, South Australia
Department of Water, Western Australia
Geoscience Australia, Canberra
Murray-Darling Basin Authority, Canberra
NSW Office of Water, New South Wales,
Southern Rural Water, Victoria
Geofabric Groundwater Cartography is part of a suite of Geofabric products produced by the Australian Bureau of Meteorology. The geometry of this product is derived from the Interim GroundWater Data (IGWD) V1.0 built from multiple sources derived from both Commonwealth and State jurisdictions. It consists of Aquifer Boundaries, and associated Outcrop, Contour, Salinity and Yield as well as Surficial Hydrogeology Unit and Water Table Aquifers and associated Water Table Salinity, Yield and Hydraulic Conductivity. The feature class terminology for Geofabric Groundwater Cartography components has been modified to distinguish it in terms of the products underlying data model.
Data sources and processing of the IGWGD
AHGFAquiferBoundary
Data sources
• Basin in a Box (MDBA),
• Groundwater Status Report (MDBA),
• Southern Victorian Groundwater mapping (SRW),
• Daly Basin groundwater mapping (DNRETA),
• GAB hydrogeological mapping (BRS),
• Divertible Water Allocation Information Database aquifers (DoW),
• coastline from Geodata v3 framework data set (GA).
Processing steps
Grid to polygon conversion for Southern Victoria and where defined aquifer boundaries did not generate closed polygons, addition arcs have been generated using the extent of corresponding structure contours. Data sets were combined into a single ArcInfo coverage and adjusted to align with the national coastline and then converted to a single file geodatabase feature class.
Generated single multipart features using the dissolve function. Perth – Yarragadee North and Perth – Yarragadee South has been merged to Perth Yarragadee. Yarragadee, Leederville and Birdrong have been created by dissolving salinity features for these aquifers. Features which were merged have been indicated with FeatureSource = “Sinclair Knight Merz” and the TextNote = “Generated by SKM from inputs sourced for the IGWDB”. Lower and Upper Renmark boundaries have been aligned to the extent of salinity mapping for these aquifers. The Calivil and Parilla aquifer boundaries have been merged and related to salinity mapping for the combined area.
AHGFAquiferContour
Data sources
• GAB Hydrogeological mapping (BRS): Structure contours of aquifers, confining beds and equivalents. Compiled by B.R. Senior & Associates Pty Ltd (1996)
• Basin in a Box (MDBA); with the following notes
Edge matching - there are significant discrepancies at some mapsheets boundaries
Contour intervals - not all contours are closed, and the intervals between contours are not consistent across the whole theme
Contour values - in areas of steep gradients some contour values change through the length of the line
Contour branching – in areas of steep gradient some contours fork.
Alice Springs Groundwater (DNRETA)
Daly Basin Groundwater (DNRETA)
Southern Victoria Groundwater Mapping (SRW).
Processing steps
Grid to contour conversion for southern Victoria. Correction of attribute for some contours sourced from the Basin in a Box data sets. Data sets were combined into a single ArcInfo coverage and adjusted to align with the national coastline and then converted to a single file geodatabase feature class. Overlapping contours were clipped to their respective aquifer boundary polygon.
AHGFSurficialHydrogeologyUnit
Data sources
• National geology (statewide data sets), 090609 (GA)
• NT_Aquifers_r.shp (DNRETA)
• TasKarstv3 (DPIPWE)
• gw_pros.shp (DIER)
• Hydrogeology_WA_Statewide-DOW_HGU.shp (DOW)
• Victorian Aquifer Framework (Sinclair Knight Merz 2009).
Processing steps
State shapefiles were collated into a single national surface geology ArcInfo coverage. Tasmanian karst areas were intersected with this data set. The interim aquifer framework (IAF) was developed to relate geological units mapped in this data set to a set of aggregated aquifers/aquitards. The main sources of information for the aquifer classification in the various jurisdictions are:
• Victoria: Based on the Victorian Aquifer Framework (Sinclair Knight Merz, 2009)
• New South Wales, Queensland and South Australia: based on classifications of the surface and underlying geology undertaken in this project guided by local aquifer classifications in the Great Artesian Basin and State jurisdictions (especially the Murray Darling Basin 1:250,000 hydrogeological map series)
• Western Australia: Based on State aquifer mapping undertaken by the Western Australian Department of Water
• Northern Territory: Based on the Northern Territory Groundwater Map produced by DNRETA
• Tasmania: Based on the Tasmania Groundwater Map developed by DIER
IGWAquiferSalinity
Data sources
• Basin in a Box (MDBA)
• Southern Victoria Groundwater mapping (SRW)
• Geodata v3 framework data set (GA)
• Groundwater salinity, Superficial and Confined Aquifers (DoW).
Processing steps
Grid to polygon conversion for Southern Victoria. Data sets were combined into a single ArcInfo coverage and adjusted to align with the national coastline and then converted to a single file geodatabase feature class. Overlapping salinity polygons were clipped to their respective aquifer boundary, typically slivers resulting from digitising errors. Where underlap slivers existed, the polygons were extended to match the aquifer boundary.
IGWAquiferYield
Data sources
• Basin in a Box (MDBA)
• Southern Victoria Groundwater mapping (SRW)
• Geodata v3 framework data set (GA).
Processing steps
Grid to polygon conversion for Southern Victoria. Data sets were combined into a single ArcInfo coverage and adjusted to align with the national coastline and then converted to a single file geodatabase feature class. Overlapping yield polygons were clipped to their respective aquifer boundary, typically slivers resulting from digitising errors. Where underlap slivers existed, the polygons were extended to match the aquifer boundary.
AHGFAquiferOutcrop
Data sources
• WaterTableAquifer
• AquiferBoundary
• 1:1,000,000 scale National surface geology.
Processing steps
For significant confined aquifers the AquiferBoundary layer was intersected with either the corresponding surface geology from the 1:1,000,000 scale national surface geology layer or the corresponding aquifer with the same Interim Aquifer Classification as the “WaterTable Aquifer” layer. The portions of the aquifer which are co-incident in this intersection were then defined as the outcropping portions of the aquifer. Where the aquifer name was explicitly defined in the surface geology layer, the intersection with the surface geology was used otherwise the WaterTable Aquifer was used.
AHGFWaterTableAquifer
Data sources
• National geology (statewide data sets), 090609 (GA)
• NT_Aquifers_r.shp (DNRETA)
• TasKarstv3 (DPIPWE)
• gw_pros.shp (DIER)
• Hydrogeology_WA_Statewide-DOW_HGU.shp (DOW)
• Victorian Aquifer Framework (SKM 2009).
Processing steps
State geology shapefiles were collated into a single national surface geology ArcInfo coverage. State wide hydrogeological mapping data sets (Tasmania, WA, NT) have been intersected with the geology and the source aquifer names retained (SrcAqName) and related to the Interim Aquifer Framework entities. Tasmanian karst areas were integrated with the data set. For remaining areas, geological units have been assigned to IAF entities according to regional mapping (GAB, MDB, Southern Victoria) and liaison with state groundwater management agencies.
IGWWaterTableSalinity
Data sources
• Basin in a Box (MDBA)
• Southern Victoria Groundwater mapping (SRW)
• GAB Hydrogeological mapping (BRS)
• NSW Groundwater Vulnerability mapping inputs (NoW)
• Geodata v3 framework data set (GA)
• NT Groundwater Salinity mapping (DNRETA)
• Tasmanian Groundwater Prospectivity map (DIER)
• Victorian Beneficial Use mapping (DSE)
• Groundwater Salinity, Statewide (DoW)
• Irrigat_suit_1_02,shp and Salinity_less_3000.shp (DfW, SA).
Processing steps
Grid to polygon conversion for Southern Victoria. In some parts of NSW where the source data mapped salinity classes as 1500 – 5000, the 3000 line was interpolated and included to enable the above and below 3000 classification to be complete. Data sets were combined into a single ArcInfo coverage and adjusted to align with the national coastline and state boundaries where applicable and then converted to a single file geodatabase feature class.
IGWWaterTableYield
Data sources
• Basin in a Box (MDBA)
• Southern Victoria Groundwater mapping (SRW)
• NSW Groundwater Vulnerability mapping inputs (NoW)
• Geodata v3 framework data set (GA)
• NT_Aquifers_r.shp (DNRETA).
Processing steps
Grid to polygon conversion (Southern Victoria). Data sets were combined into a single ArcInfo coverage and adjusted to align with the national coastline and then converted to a single file geodatabase feature class.
IGWWaterTableHydraulicConductivity
Data sources
Groundwater flow systems (MDBA) defined as part of the CSIRO Commercial Environmental Forestry program.
Processing steps
Shapefile was imported into a single Geodatabase feature class and attribution completed.
Geofabric processing steps:
1. IGWGD dataset is received and loaded into the Geofabric development GIS environment.
2. Feature classes from IGWGD are recomposed into composited Geofabric Groundwater dataset feature classes in the Geofabric Maintenance Geodatabase.
3. Re-composited feature classes in the Geofabric Maintenance Geodatabase Groundwater Dataset are assigned unique Hydro-IDs using ESRI ArcHydro for Surface Water (ArcHydro: 1.4.0.180 and ApFramework: 3.1.0.84)
4. Feature classes from the Geofabric Maintenance Geodatabase Groundwater dataset are extracted and reassigned to the Geofabric Groundwater Cartography Feature Dataset within the Geofabric Groundwater Cartography Geodatabase.
A complete set of data mappings, from input source data to Geofabric Products, is included in the Geofabric Product Guide, Appendices.
Aquifer Salinity Data sources:
Basin in a Box (MDBA)
Southern Victoria Groundwater mapping (SRW)
Geodata v3 framework data set (GA)
Groundwater salinity, Superficial and Confined Aquifers (DoW).
Aquifer Yield Data sources:
Basin in a Box (MDBA)
Southern Victoria Groundwater mapping (SRW)
Geodata v3 framework data set (GA).
Aquifer Outcrop Data sources:
WaterTableAquifer
AquiferBoundary
1:1,000,000 scale National surface geology.
Water Table Aquifer Data sources:
National geology (statewide data sets), 090609 (GA)
NT_Aquifers_r.shp (DNRETA)
TasKarstv3 (DPIPWE)
gw_pros.shp (DIER)
Hydrogeology_WA_Statewide-DOW_HGU.shp (DOW)
Victorian Aquifer Framework (Sinclair Knight Merz 2009).
Water Table Salinity Data sources:
Basin in a Box (MDBA)
Southern Victoria Groundwater mapping (SRW)
GAB Hydrogeological mapping (BRS)
NSW Groundwater Vulnerability mapping inputs (NoW)
Geodata v3 framework data set (GA)
NT Groundwater Salinity mapping (DNRETA)
Tasmanian Groundwater Prospectivity map (DIER)
Victorian Beneficial Use mapping (DSE)
Groundwater Salinity, Statewide (DoW)
Irrigat_suit_1_02,shp and Salinity_less_3000.shp (DfW, SA)
Water Table Yield Data sources:
Basin in a Box (MDBA)
Southern Victoria Groundwater mapping (SRW)
NSW Groundwater Vulnerability mapping inputs (NoW)
Geodata v3 framework data set (GA)
NT_Aquifers_r.shp (DNRETA).
Water Table Hydraulic Conductivity Data sources:
Groundwater flow systems (MDBA) defined as part of the CSIRO Commercial Environmental Forestry program.
Changes at v2.1
- Attribute change from BedrockContourBottom to BedrockCountourTop in the
AHGFAuquiferContour feature class.
Changes at v2.1.1
- 9999 values for ConValue field of AHGFAquiferContour features set to
NULL.
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