A comprehensive assessment of environmental outcomes in South Australia under the Murray Darling Basin Plan shows environmental water is having a positive impact on ecosystems, biodiversity and habitat quality.

Among the findings was that increased freshwater flows through the barrages has increased the resilience of fish species including black bream, greenback flounder and small-mouthed hardyhead.

Upstream, increasing connectivity of wetlands and floodplains has improved outcomes for native freshwater fish, vegetation and waterbird species.

The report also emphasises the need to recover the 450GL of environmental water as soon as possible, and from the southern Basin, to maximise environmental outcomes across the system, including increasing resilience to climate change.

State Environment Minster Susan Close says the Plan’s 450GL environmental water target, which is absolutely critical for South Australia and the health of the entire River, has surged to 286GL under the current federal government, compared to 2GL over the previous decade.

As a result, the River Murray and its wetlands and tributaries are in significantly better shape, despite drought conditions throughout parts of South Australia and western Victoria.

“This evaluation has reinforced the importance of delivering the Basin Plan in full, including final 450GL of environmental water and addressing water delivery constraints, to ensure the health of the River Murray and protect our unique ecosystems.

“Through this prolonged dry spell, that water has become even more important for the river’s ecology to ensure we maintain a healthy aquatic environment, which supports water supply, irrigation, recreation and tourism.

The assessment found:

• Water for the environment is essential for ecosystems to thrive and its coordinated delivery along the entire length of the River Murray has contributed to improved environmental outcomes in SA.
• The operation of infrastructure, including floodplain and wetland regulators, has expanded water delivery areas, increasing connectivity and improving outcomes for native fish, vegetation and waterbird species.
• Increased freshwater flows through the barrages have provided critical pathways for the movement of fish and increased resilience of species, including black bream, greenback flounder and small-mouthed hardyhead.
• The Basin Plan has provided improved environmental outcomes during low flow periods, likely preventing similar outcomes to those during the Millennium Drought, but more is needed to ensure ongoing recovery and health.
• Despite improvements, challenges remain particularly in the southern Coorong and sustained actions, operations and additional investment are required to secure long-term environmental outcomes.

The Basin Plan was adopted by the federal government in 2012 and aims to ensure the long-term health and sustainability of the Murray-Darling Basin.

To read the report visit the DEW website. Department for Environment and Water - Basin Plan evaluation