This is the master metadata record for the Victorian Aquifer Framework (VAF) 3D Surfaces dataset. For information on each aquifer surface, please refer to the separate metadata record.
DEPI originally engaged GHD to develop seamless 3D aquifer surfaces for the Victorian Aquifer Framework (VAF). The seamless mapping of aquifers across the state provides the fundamental framework for groundwater resource management, underpins development of a revised management structure for Victoria (the Secure Allocation Future Entitlement project funded by the National Water Commission) and contributes to the data needs of the Bureau of Meteorology National Groundwater Information System (NGIS).
The original dataset was produced by GHD in 2012 using (in part) data provided by Southern Rural Water Corporation and Goulburn-Murray Water Corporation. It has been subsequently amended by Hocking et al and SKM in 2013.
Search Words:
Inland waters
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Geoscientific information
Publication Date:
Dataset Status:
Victoria
Progress:
Completed
Access Constraint:
Creative Commons Attribution 4.0 (CC-BY)
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License Text
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Data Existence:
Metadata Name
Descriptions
Resource Name:
VAF
Title:
Victorian Aquifer Framework (VAF) 3D Surfaces
Anzlic ID:
ANZVI0803004940
Custodian:
Owner:
Jurisdiction:
Victoria
Abstract:
This is the master metadata record for the Victorian Aquifer Framework (VAF) 3D Surfaces dataset. For information on each aquifer surface, please refer to the separate metadata record.
DEPI originally engaged GHD to develop seamless 3D aquifer surfaces for the Victorian Aquifer Framework (VAF). The seamless mapping of aquifers across the state provides the fundamental framework for groundwater resource management, underpins development of a revised management structure for Victoria (the Secure Allocation Future Entitlement project funded by the National Water Commission) and contributes to the data needs of the Bureau of Meteorology National Groundwater Information System (NGIS).
The original dataset was produced by GHD in 2012 using (in part) data provided by Southern Rural Water Corporation and Goulburn-Murray Water Corporation. It has been subsequently amended by Hocking et al and SKM in 2013.
This dataset has been derived from datasets of varying and not always known accuracy. These source datasets include the Geological Survey 1:250,000 outcrop geology mapping, borehole data and approximate hydraulic conductivity to represent general lithology or aquifer potential.
Attribute Accuracy:
Not known and has not been assessed.
Logical Consistency:
Not known.
Data Source:
Dataset Source: A number of key input datasets were sourced as part of the process to derive the 3D aquifer surfaces. These datasets included:
The DEPI State-wide Stratigraphic Database (SSD);
The National Groundwater Information System (NGIS) database containing groundwater borehole location information as well as lithological and stratigraphic information;
Raster layers previously produced for Southern Rural Water (SRW) by SKM and GHD in 2009;
The crystalline basement surface provided by the former Department of Primary Industries (DPI);
Outcrop 1:250,000 scale geological mapping compiled by the former Geological Survey of Victoria, DPI;
A state-wide 100m Digital Elevation Model (DEM) based on the DEPI 20m DEM. This was used to represent the natural surface;
Data generated using DEPI's state-wide ecoMarkets groundwater modelling package to assist with the definition of key layers of the major Cainozoic aquifers;
Latrobe Valley Coal Model which was used to provide a framework for the hydro-stratigraphy of the wet Gippsland Basin;
Rasters of the top elevation of the major aquifer systems covering the Kiewa, Ovens, Goulburn-Broken and Loddon and Campaspe catchments;
Data extracted from the Basin in a Box, the Murray Basin Hydrological Map Series and the Murray-Darling Basin Groundwater Status 1990-2000: Summary Report;
Airborne magnetic data publicly available from raster data published by the former Geological Survey of Victoria, DPI.
Once the input data had been compiled, the VAF 3D surfaces were developed by lfollowing a number of key steps, summarised below:
(1) Contours as polylines and aquifer extents as polygons were extracted from previous mapping surfaces;
(2) Outcrop points attributed with values from the DEM were created;
(3) Based on the state-wide stratigraphic database, the contours and extents were refined or created;
(4) A top elevation raster was interpolated using contours, outcrop points and bore data then replacing outcrop areas with the DEM;
(5) The aquifer thickness was then checked in GIS by comparing layers against each other and assessing for cross-overs and negative thickness;
(6) The input data was then revised and bore data, contours, and aquifer extents modified as required due to errors in the thickness;
(7) If there were subsequent issues identified such as overlaps between aquifers, mismatches between bores and resulting layers, then the process was revised by returning to Step (3);
(8) If the layers were matching well, then extent points were created to smooth layers at the edges;
(9) A top elevation raster was generated again using contours, outcrop points, extent points and bore data;
(10) The aquifer thickness was checked again, and if significant issues were identified, then the process returned back to Step (3) for further iteration;
(11) Further modifications were applied to remove negative thicknesses and to provide minimum thickness of overburden;
(12) Top and bottom elevation rasters were then generated at 100m pixel resolution to form the final dataset.
In generating each of the layers, a number of Quality Assurance (QA) measures were implemented at various stages of the process. These included a topologic review, a hydrogeological review and an external reveiw by Spatial Vision.
The original dataset was published in May 2012 and subsequent revisions have been conducted by Hocking et al and SKM in 2013.
Dataset Originality: Derived
Contact Organisation:
Contact Position:
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Metadata Date:
2021-07-14
Additional Metadata:
Related Documents: None
http://www.depi.vic.gov.au/water/groundwater/groundwater-resource-reports
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