Metadata Name Descriptions
Resource Name: Victorian Aquifer Framework (VAF) 3D Surfaces
Title: Victorian Aquifer Framework (VAF) 3D Surfaces
Anzlic ID: ANZVI0803004940
Custodian: Department of Environment, Land, Water & Planning
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.
Search Words: Inland watersGeoscientific information
Currency Date: 18 May 2022
Dataset Status: Completed
Progress: Victoria
Access Constraint:
.
Data Existence:
Metadata Name Descriptions
Resource Name: Victorian Aquifer Framework (VAF) 3D Surfaces
Title: Victorian Aquifer Framework (VAF) 3D Surfaces
Anzlic ID: ANZVI0803004940
Custodian: Department of Environment, Land, Water & Planning
Owner: Department of Environment, Land, Water & Planning Department of Environment, Land, Water & Planning
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.
Search Words: Inland watersGeoscientific information
Purpose:
Aquifer Name, Aquifer Code, Aquifer Number:
Quaternary Aquifer 	                                             QA	            100
Upper Tertiary/Quaternary Basalt Aquifer             UTB	            101
Upper Tertiary/Quaternary Aquifer	             UTQA	            102
Upper Tertiary/Quaternary Aquitard	             UTQD	            103
Upper Tertiary Aquifer (marine)	                             UTAM	            104
Upper Tertiary Aquifer (fluvial)	                             UTAF	            105
Upper Tertiary Aquitard	                             UTD	            106
Upper Mid-Tertiary Aquifer	                             UMTA	            107
Upper Mid-Tertiary Aquitard	                             UMTD	            108
Lower Mid-Tertiary Aquifer	                             LMTA	            109
(Lower) Tertiary Basalts	                             LTB	            112
Lower Mid-Tertiary Aquitard	                             LMTD	            110
Lower Tertiary Basalts	                             LTB	            112
Lower Tertiary Aquifer	                             LTA	            111
Lower Tertiary Basalts	                             LTB	            112
Cretaceous and Permian Sediments	             CPS	            113
Mesozoic and Palaeozoic Bedrock	             BSE 	            114
Geographic Extent Polygon:
Geographic Bounding Box:
-34
141 150
-39
Beginning to Ending Date: 2012-06-01 - 2013-09-05
Maintainence and Update Frequency: As needed
Stored Data Format: DIGITAL: ESRI ASCII GRID, JEPG2000 12
Available Format(s) Types: DIGITAL
Lineage:
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
Positional Accuracy:
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: Department of Environment, Land, Water & Planning
Contact Position: VSDL Dataset Data Manager
Address: PO Box 500 East Melbourne Vic 3002 Australia
Telephone:
Facsimile:
Email Address: data.vsdl@delwp.vic.gov.au
Metadata Date: 2021-07-14
Additional Metadata:
                            
                              Related Documents: None

http://www.depi.vic.gov.au/water/groundwater/groundwater-resource-reports
                            
                          
No attributes