Australia’s Murray–Darling Basin is the nation’s food bowl — a vast river system spanning approximately 1 million square kilometres that produces 40% of the country’s agricultural output and supplies drinking water to more than 3 million people. Yet beneath its surface, the Basin is in ecological crisis. Waterbird populations have collapsed by more than 70% over four decades. Native fish species have disappeared from most of their historic river range. And despite a decade of Basin Plan reform, the rivers still do not receive anywhere near the water they need to survive. This is not a distant future problem. It is happening now, largely out of public view.

Interactive note: Hover over each chart to view exact values. Click legend items to isolate or compare groups.

  1. Basin water storage has swung from crisis to flood — and back again

    Total water in storage across the Murray–Darling Basin as a percentage of capacity, 2015–2024

Source: Bureau of Meteorology, National Water Account 2023 (mdbwip.bom.gov.au); Murray–Darling Basin Authority, Current Basin Water Storage Reports 2021-2024. Hover: storage volume (Gl).

By 2019, following years of drought, the Basin’s total storage had fallen to just 22% of capacity — its lowest level in decades. The 2022 floods briefly brought it back to a near-record 94%. But by late 2024, storage had dropped back to 74% and continues to fluctuate with extreme weather. These violent swings between drought and flood are becoming more frequent, making long-term river management increasingly difficult and unpredictable.

  1. Irrigation dominates water use — the environment gets far less

    Annual water allocation by use type across the Murray–Darling Basin, 2019–2023 (gigalitres)

Source: BOM: Bureau of Meteorology, National Water Account 2023, Murray–Darling Basin (mdbwip.bom.gov.au); ACCC: Murray–Darling Basin Rural Water Monitoring Report 2022–23 (accc.gov.au); MDBA: Basin Plan Annual Report 2023–24. Hover for volumes that are precise.

In 2022–23, the total surface water allocated across the Basin was 12,668 gigalitres. Of this, approximately 70% went to irrigation and agriculture. Environmental flows — the water kept in rivers to support ecosystems — received far less, even during flood years when water was plentiful. The 2012 Basin Plan set a target of returning 2,750 GL per year to the environment. More than a decade later, that target has still not been reached.

  1. Some native fish now survive in less than 10% of their historic habitat

    Percentage of historic river kilometres still occupied by key Murray–Darling Basin fish species

Source: Robinson W., Koehn J. and Lintermans M. (2024). Common riverine fish species from Australia’s Murray–Darling Basin (common riverine fishes) and Murray–Darling Basin Authority, Threatened Fish Species in the Murray–Darling Basin (2023).

A landmark 2024 peer-reviewed study tracking fish populations across the entire Basin found that silver perch, southern pygmy perch, and freshwater catfish now occupy less than 10% of the river kilometres they historically inhabited. Even species once considered common, such as golden perch, have disappeared from nearly a third of their former range. In March 2023, a massive fish kill involving millions of dead fish was recorded in the Darling-Baaka River at Menindee — the largest on record.

  1. Waterbird populations have collapsed by more than 70% since 1983

    Waterbird population index by group (1983 = 100), Murray–Darling Basin 1983–2023

Source: Kingsford, R. T., Bino, G., & Porter, J. L. (2017). Continental impacts of water development on waterbirds — Global Change Biology, 23(11), 4958–4969; NSW Department of Climate Change, Energy, Environment and Water, NSW State of the Environment 2024: Rivers and wetlands; DCCEEW Meeting Environmental Needs in the Murray–Darling Basin (2024).

A landmark 32-year UNSW study found a 72% collapse in waterbird numbers between 1983 and 2014 — declines recorded across more than half of all waterbird species surveyed. The 2022 floods temporarily boosted populations as wetlands flooded and breeding opportunities surged. But by 2023, numbers had fallen again. The NSW State of the Environment 2024 report confirmed that long-term declines are continuing, driven by reduced water flows, habitat loss, and increasingly unpredictable flood cycles.

  1. A decade of reform — and the rivers still need 1,093 gigalitres more

    Cumulative environmental water recovered vs Basin Plan targets, 2012–2023 (GL/year)

Source: With reference to Murray–Darling Basin Authority, Progress on Water Recovery — 2,107.4 GL/yr recovered as at 30 June 2023 (MDBA, 2026); Water Amendment (Restoring Our Rivers) Act 2023 (Cth) — increased water recovery target of 3,200 GL/yr; MDBA, Basin Plan Annual Report 2023–24.

The 2012 Murray–Darling Basin Plan set a target of returning 2,750 gigalitres per year to the environment. As of June 2023, only 2,107 GL/yr had been recovered — a shortfall of 643 GL/yr after more than a decade of effort. The 2023 Restoring Our Rivers Act raised the target further to 3,200 GL/yr, meaning the gap has actually grown to over 1,000 GL/yr. Without meaningful acceleration of water recovery, the Basin’s rivers, wetlands, fish, and birds will continue to decline — largely invisible to most Australians, but irreversible for all of them.

Data note: Values used in the visualisations were manually extracted and standardised from the listed government reports and peer-reviewed sources. Where exact yearly values were not published in a single table, figures were compiled from the most relevant published reports and are cited in the chart source notes.

References

Bureau of Meteorology. (2023). Murray–Darling Basin: National Water Account 2023. Australian Government. https://mdbwip.bom.gov.au

Murray–Darling Basin Authority. (2024). Basin Plan annual report 2023–24. Australian Government. https://www.mdba.gov.au/publications-and-data/publications/basin-plan-annual-report

Murray–Darling Basin Authority. (2023). Threatened fish species found in the Murray–Darling Basin. Australian Government. https://www.mdba.gov.au/news-and-events/newsroom/threatened-fish-species-found-murray-darling-basin

Murray–Darling Basin Authority. (2026). Progress on water recovery. Australian Government. https://www.mdba.gov.au/climate-and-river-health/water-environment/water-recovery/progress-water-recovery

Robinson, W., Koehn, J., & Lintermans, M. (2024). Contemporary trends in the spatial extent of common riverine fish species in Australia’s Murray–Darling Basin. Fishes, 9(6), 221. https://doi.org/10.3390/fishes9060221

Australian Competition and Consumer Commission. (2024). Murray–Darling Basin rural water monitoring report 2022–23. Australian Government. https://www.accc.gov.au/system/files/accc-water-monitoring-report-2022-23.pdf

NSW Department of Climate Change, Energy, Environment and Water. (2024). NSW State of the Environment 2024: Rivers and wetlands. https://www.soe.epa.nsw.gov.au/all-themes/waters/rivers-and-wetlands-2024

Department of Climate Change, Energy, the Environment and Water. (2024). Meeting environmental needs in the Murray–Darling Basin. Australian Government. https://www.dcceew.gov.au/water/policy/environmental-needs

Kingsford, R. T., Bino, G., & Porter, J. L. (2017). Continental impacts of water development on waterbirds, contrasting two Australian river basins: Global implications for sustainable water use. Global Change Biology, 23(11), 4958–4969. https://doi.org/10.1111/gcb.13743

Water Amendment (Restoring Our Rivers) Act 2023 (Cth). https://www.legislation.gov.au/C2023A00129

Acknowledgements

Generative AI was only used to debug code errors and fix formatting issues during development. All topic selection, data sourcing, visualisation design, narrative writing, and R code were developed independently by the author. AI assistance was limited to resolving technical bugs and was not used for content creation or decision making.