17.3 Leakage to groundwater
This item represents recharge to groundwater from surface water. This volume could not be quantified in a way that was complete, neutral and free from material error.
A knowledge gap exists regarding groundwater–surface water interactions in the Melbourne region. Information about groundwater recharge from surface water was not reported in the Port Phillip Catchment Management Authority groundwater model (Department of Sustainability and Environment 2010a) or in the groundwater resource appraisal for southeast Melbourne (Southern Rural Water Authority 2010).
Recharge to groundwater from surface water occurs when surface water levels are higher than groundwater levels. This is typically more common in flatter parts of the landscape and when pumping occurs close to a river.
Groundwater–surface water interactions were not considered to be important for the regional surface water and ground water balance, and their omission does not have a material impact on this report.