This project investigated the groundwater resources of the Adelaide Plains with the aims to:
A range of both well-established and innovative techniques were applied, including:
The flux estimates obtained from field and desktop-based investigations were generally in good agreement with the outcomes of the regional flow model. Diffuse recharge in the Plains is an exception, being estimated to equate 0.8 % of rainfall by the CMB method and an order of magnitude less by the model (via calibration). The simplifying assumptions underlying the CMB method are numerous, but the model-based estimate is also prone to uncertainty. Additional work is required to refine the quantification of diffuse recharge in the Plains.
A new regional groundwater flow and transport model of the Adelaide Plains has been developed. Such a model is viewed as the best tool available to integrate the data as it allows accounting for all spatiotemporal constraints implied by the regional setting. The model domain extends from the major faults at the foothill of the Mount Lofty Ranges (MLR) in the south and south-east, up to 5 km offshore in the west and it is bounded by the Light River in the north. Compared to previous modelling efforts for the same area, the new platform includes the following key improvements: