Great Artesian Basin - Coreena Wallumbilla Aquifer - Total Dissolved Solids

Data used to produce the predicted Total Dissolved Solids map for the Wallumbilla - Rolling Downs Group aquifers in the Hydrogeological Atlas of the Great Artesian Basin (Ransley et.al., 2015). There are four layers in the Wallumbilla - Rolling Downs Group aquifers Total Dissolved Solids map data. A. Location of hydrochemistry samples (Point data, Shapefile) B. Predicted Concentration (Filled contours , Shapefile) C. Predicted Concentration Contours (Contours, Shapefile) D. Prediction Standard Error (Filled contours , Shapefile) The predicted values provide a regional based estimate and may be associated with considerable error. It is recommended that the predicted values are read together with the predicted error map, which provides an estimate of the absolute standard error associated with the predicted values at any point within the map. The predicted standard error map provides an absolute standard error associated with the predicted values at any point within the map. Please note this is not a relative error map and the concentration of a parameter needs to be considered when interpreting the map. Predicted standard error values are low where the concentration is low and there is a high density of samples. Predicted standard errors values can be high where the concentration is high and there is moderate variability between nearby samples or where there is a paucity of data. Concentrations are Total Dissolved Solids mg/L. Coordinate system is Lambert conformal conic GDA 1994, with central meridian 134 degrees longitude, standard parallels at -18 and -36 degrees latitude. The Wallumbilla - Rolling Downs Group aquifers Total Dissolved Solids map is one of two hydrochemistry maps for the Wallumbilla - Rolling Downs Group aquifers and 24 hydrochemistry maps in the Hydrogeological Atlas of the Great Artesian Basin (Ransley et. al., 2014). This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 81691. References: Ransley, T., Radke, B., Feitz, A., Kellett, J., Owens, R., Bell, J. and Stewart, G., 2015. Hydrogeological Atlas of the Great Artesian Basin. Geoscience Australia. Canberra. [available from www.ga.gov.au using catalogue number 79790] Hitchon, B. and Brulotte, M. (1994): Culling criteria for 'standard' formation water analyses; Applied Geochemistry, v. 9, p. 637-645