The Flow-MER Program

Flow-MER is the Commonwealth Environmental Water Holder’s science program, working in partnership with scientists, water managers and communities across the Murray–Darling Basin. Our aim is to understand how our rivers, wetlands, floodplains, and the plants and animals depending on them, are responding to Commonwealth environmental water.

Photo: Sharp-tailed sandpipers in the Mallowa Wetlands, Nov 2022. Credit: Tim Henderson.

Environmental water is water used to keep our rivers, wetlands and floodplains healthy, and is important for the animals, plants, and people that depend on them.

The Murray–Darling Basin is the largest and most complex river system in Australia. It covers 1 million square kilometres of south-eastern Australia, across New South Wales, Queensland, South Australia, Victoria and the Australian Capital Territory.

Flow-Monitoring, Evaluation and Research (Flow-MER) is the Commonwealth Environmental Water Holder’s (CEWH's) Science Program to inform adaptive management of Commonwealth environmental water in the Murray–Darling Basin. The Flow-MER Program supports the CEWH's work to protect and restore the Basin's water-dependent ecosystems.

Charles Sturt University staff member John Trethewie measuring water quality in a small, highly productive flood runner within Werai Forest. Credit: Dr. Andre Siebers, La Trobe University

In 2022–23, 102 watering actions delivered 1,385 GL of Commonwealth environmental water to rivers, wetlands and floodplains across all 19 Basin valleys. Commonwealth environmental water supported 22,205 km of rivers, 202,071 ha of lakes and wetlands, 71,837 ha of floodplains and 23,768 ha of estuary in the Coorong and Murray Mouth.

Since 2014, 15,443 GL of Commonwealth environmental water has supported 249,079 ha of lakes and wetlands, 187,486 ha of floodplains, 27,715 km of waterways and 23,768 ha of estuarine ecosystems, representing 85% of the diversity of aquatic ecosystems found in the Basin.

Commonwealth environmental water has supported submerged, amphibious and damp-loving plant species, native fish, waterbirds and a range of other fauna, including species of conservation significance.

11 of the 16 Ramsar wetlands in the Basin can receive Commonwealth environmental water. Since 2014, all 11 received Commonwealth environmental water at least once (in conjunction with other water delivery).

Environmental water is preventing the loss of characteristic wetland and floodplain plants by maintaining wetter hydrological regimes. In the absence of Commonwealth environmental water, important assemblages of species would be markedly reduced in extent. There would be a reduction in vegetation community richness, with a high risk of permanent transitions to altered vegetation community assemblages and loss of resilience of water-dependent plant communities.

Commonwealth environmental water has provided a range of benefits to native fish populations and supported critical life-history processes, such as recruitment, body condition and population growth.

In low-flow years, Commonwealth environmental water has become increasingly important for managing dissolved oxygen levels, sustaining salt export from the Basin and for limiting salt import to the Coorong.

Our work: Monitoring, evaluation and research

Across the Murray–Darling Basin

We use monitoring, evaluation and research to assess environmental outcomes and inform adaptive management, using the below indicators that reflect the health of the Basin.

River Systems

We also work along 10 river systems within the Basin, conducting targeted monitoring and research to understand local ecosystem responses and inform water management practices.

First Nations Knowledge
and Science

First Nations people have a deep and lasting connection to their lands and waters. Their knowledge and science meant their Country was looked after. Since European colonisation First Nations people have mostly been left out of managing and making decisions about their Country.

It is important we consider different knowledges to improve how we deliver water. We have listened to First Nations people we work with and understand that they need to be included in our monitoring, evaluation and research. Knowledges shared by First Nations people will help achieve better environmental outcomes.

We are building connections with First Nations people to understand how Flow-MER can support First Nations people to care for their Country according to their lore and values. We have dedicated funding to support research and monitoring activities important to First Nations people.

Students examining native fish during an Indigenous Ecology in Action workshop, highlighting hands-on learning and environmental education in the Murray–Darling Basin.
Students participate in 'Indigenous Ecology in Action' workshop run by the Lower Murray team. Credit: South Australian Research and Development Institute (SARDI)

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