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In recent years there has been increasing awareness of the impacts of acid sulfate soils in the Anna Bay sub-catchment, which discharges into the Port Stephens – Great Lakes Marine Park. Greater movement of acidic groundwater has resulted in fish kills, poor water quality affecting oyster cultivation, reduced stock production and a deterioration in downstream environmental values.
This report provides the results of detailed on-ground assessments of the distribution and impacts of acid sulfate soils. These assessments included:
The assessments identified the presence of acid sulfate soils across the catchment with two key ‘hotspot’ areas of soil acidity.
The report also identifies on-ground works that would be most effective at retaining high groundwater levels to manage acid export, while ensuring better drainage of surface waters following floods and severe rain events.