SOURCE:

Data was obtained from a variety of sources, as listed below.

1. Geoscience Australia GAB hydrochemistry dataset 1973-1997. A reduced version of this dataset is published in Radke BM, Ferguson J, Cresswell RG, Ransley TR and Habermehl MA (2000) Hydrochemistry and implied hydrodynamics of the Cadna-owie - Hooray Aquifer, Great Artesian Basin, Australia. Canberra, Bureau of Rural Sciences: xiv, 229p. The full dataset remains unpublished.

2. Radke, B. M., J. Ferguson, et al. (2000). Hydrochemistry and implied hydrodynamics of the Cadna-owie - Hooray Aquifer, Great Artesian Basin, Australia. Canberra, Bureau of Rural Sciences: xiv, 229 p.

3. Geological Society of Queensland water chemistry database (1970s to 1980s). Muller, PJ, Dale, NM (1985) Storage System for Groundwater Data Held by the Geological Survey of Queensland. GSQ Record 1985/47. Queensland.

4. Love, A., D. Wohling, et al., Eds. (2012). Allocating water and maintaining springs in the Great Artesian Basin, Volume II: Groundwater recharge, hydrodynamics and hydrochemistry of the western Great Artesian Basin. Canberra, National Water Commission.

5. NSW Department of Primary Industries water quality database

6. SA Department of Water, Land and Biodiversity Conservation water chemistry data.

7. Hydrochemistry data from Western Mining Corporation (now BHP Biliton)

8. Well completion reports from QPED database: Geological Survey of Queensland (2010). "Queensland Petroleum Exploration Data (QPED) database." Retrieved 25 September 2011, from http://www.dme.qld.gov.au/mines/petroleum_geoscience_data.cfm

9. Kellett, J. R., T. R. Ransley, et al. (2003). Groundwater Recharge in the Great Artesian Basin Intake Beds, Queensland. Final Report for NHT Project #982713 "Sustainable Groundwater Use in the GAB Intake Beds, Queensland". Department of Natural Resources and Mines Qld.

10. Hydrochemistry and isotopic variation data from Habermehl, M. A. (2003). Project - Verification of groundwater dating methods in the Great Artesian Basin, Australia. BRS - CRIEPI fieldwork 2002. Report on the field measurements and laboratory analyses results. Canberra, Bureau of Rural Sciences - Water Sciences Program for Central Research Institute of Electric Power Industry, Japan. Bureau of Rural Sciences: 95.

11. Data on the Winton-Macunda was provided by the Queensland Department of Environment and Resource Management

12. Water quality data from the Queensland groundwater database, Department of Environment and Resource Management

13. Groundwater database, Northern Territory Department of Natural Resources,Environment, the Arts and Sport

METHOD:

Where multiple analyses were available for a single bore, the geometric mean was calculated and used.

Grids were interpolated using the ESRI ArcGIS 'Topo to Raster' tool.

Grid cell size (X, Y) = 0.015 DD, 0.015 DD.

BOUNDARIES:

All except isotopic variation grids were clipped to formation boundaries modified from Welsh (2000)/ Habermehl and Lau (1997) and the GABWRA assessment boundary (Ransley TR and Smerdon BD (eds), 2012)

REFERENCES

1. Habermehl, M. A. and J. E. Lau (1997). Hydrogeology of the Great Artesian Basin Australia (Map at scale 1:2,500,000). Canberra, Australian Geological Survey Organisation.

2. Welsh, W.D. 2000. GABFLOW: A steady state groundwater flow model of the Great Artesian Basin, Bureau Rural Sciences. Canberra.

3. Ransley TR and Smerdon BD (eds) (2012) Hydrostratigraphy, hydrogeology and system conceptualisation of the Great Artesian Basin. A technical report to the Australian Government from the CSIRO Great Artesian Basin Water Resource Assessment. CSIRO Water for a Healthy Country Flagship, Australia.