The limitations on the water balances estimates provided here are a result of the limitations in the numerical modelling. The numerical modelling is described in companion product 2.6.1 for the Gloucester subregion (Zhang et al., 2018) and companion product 2.6.2 for the Gloucester subregion (Peeters et al., 2018) and should be read in conjunction with this product. The groundwater modelling results have exposed some modelling artefacts, which while not materially impacting the overall modelling results, identify areas for improvement.

The most uncertain component of the water balance that has been modelled in the Gloucester subregion is the upward flow from deeper groundwater into the alluvium. This component is the link between the groundwater extraction for CSG and coal mines represented in the deep groundwater model and the change in baseflow simulated by the alluvial groundwater model. The high variability indicates that the observations used to constrain the parameters in the deep groundwater model are inadequate to provide a precise estimate of this component of the water balance.

Last updated:
16 October 2018