What Europe’s Shrinking Rivers Reveal — And Why Australia Must Pay Attention
In northern Bulgaria this summer, the Danube River fell so low that scientists uncovered the remains of what is believed to be a woolly mammoth, a discovery historians have called “very important.” Near the Serbian village of Prahovo, the rusted hulls and broken masts of German warships scuttled during World War II rose from the riverbed, fully visible for the first time in living memory. Local fisherman Zoran Lovric described the scene as unprecedented. “These wrecks have never been visible like this. They’ve always been completely submerged,” he said.
These startling revelations are the most visible signs of a severe drought that has gripped large parts of Europe through the summer of 2026. Prolonged heatwaves and a lack of rainfall have driven several of the continent’s major rivers to record or near-record low levels. The Danube, Europe’s second-longest river, the Rhine, the Po and the Loire have all been affected. According to the European Drought Observatory, about half of Europe and the United Kingdom experienced drought conditions of varying intensity in July. Wildfires have burned across the continent at the same time.
The practical consequences have been far-reaching. Shipping on the Rhine and Danube has been heavily disrupted. At critical points such as Kaub on the Rhine, navigable water depths have dropped to as little as 15 centimetres, forcing barges to carry sharply reduced loads or halt altogether. Moving the same volume of freight now requires far more vessels, driving up costs and causing congestion. Chemical, oil, grain and industrial cargoes have been delayed or diverted to more expensive road and rail transport.
Energy systems have also come under pressure. Romania was forced to shut down its last operating reactor at the Cernavodă nuclear plant because Danube levels were too low for cooling. Hungary’s Paks plant, which normally supplies around 40 per cent of the country’s electricity, was reduced to running on a fraction of its capacity. France has limited output at several nuclear reactors for similar reasons related to low flows or elevated water temperatures. Hydropower generation across the affected corridor has also fallen significantly.
Agriculture and ecosystems are suffering too. Farmers face irrigation restrictions, reduced crop yields and difficulties shipping produce. Low oxygen levels in the shallow, warm water threaten fish populations. Armin Fojskic of the Zenica Fishermen Association warned that if conditions persist, large numbers of fish could die from suffocation.
Hydro-climatologist Peter Gleick, co-founder of the Pacific Institute, argues that these events go beyond normal weather variation. “Weather is always variable. We always have droughts. We always have floods somewhere at some time … but what we’re seeing now is extreme events worsened by human-caused climate change,” he told SBS News. Greenhouse gas emissions are warming the planet and intensifying extremes, making droughts more frequent, longer and more severe. Similar stresses are appearing elsewhere, including record-low levels in the Colorado River system and its major reservoirs in the western United States.
Australia is not insulated from these forces. Nick Bond, director of freshwater ecosystems at La Trobe University, notes that the Murray-Darling Basin — Australia’s largest river system — has been in decline for decades. The basin contains some 77,000 kilometres of rivers stretching through most of New South Wales, the ACT, and parts of Queensland, South Australia and Victoria. “Rivers across the basin have shown declining patterns of runoff. And in particular, certain parts of the Basin, we’re seeing much longer periods of cease to flow, so periods when the rivers actually stop flowing altogether,” Bond said.
These low flows have already produced repeated ecological crises. Mass fish deaths on the lower Darling (known as Baaka to Barkindji people), wetland loss and toxic algal blooms have become recurring features. Irrigated agriculture accounts for an estimated 80 to 90 per cent of water use in the basin. While extraction is a major factor, climate change is amplifying the pressure through reduced runoff, hotter temperatures and shifts in rainfall patterns, particularly the decline in late-autumn rainfall that once helped replenish systems after summer.
Bond highlights a further vulnerability that is often overlooked: the small headwater streams that feed the larger rivers. These waterways make up a large proportion of the overall river network. Even modest reductions in runoff, combined with the effects of thousands of small farm dams, are causing more of them to stop flowing for longer periods. Their loss of flow and biodiversity has cascading effects downstream.
For Aboriginal communities the stakes are cultural as well as ecological. The Murray-Darling system passes through the lands of more than 40 Indigenous nations. Bradley Moggridge, a Kamilaroi hydro-geologist at the University of Technology Sydney, says the Barkindji people, who call the lower Darling the Baaka, have watched the river change while feeling powerless to stop it. “They are the river people, the Baaka people. For them to feel helpless on their own land, I think the management has to change,” he said. First Nations knowledge, built on tens of thousands of years of observation, needs to be properly integrated into decision-making.
The Murray-Darling Basin Plan, which set legal limits on extraction in 2012, is currently under its first major review. Public consultation earlier this year engaged thousands of participants, including more than 500 First Nations people and groups. One key focus is how the plan can better respond to a hotter, drier climate and more extreme droughts, while also strengthening recognition of Indigenous rights and knowledge.
Europe’s current crisis shows how quickly the effects of shrinking rivers cascade through economies, energy systems, food production and ecosystems. Australia’s inland rivers are already displaying many of the same symptoms. Declining runoff, longer dry periods, ecological stress and competition for limited water are not distant threats. They are present realities.
The lesson is clear. Managing river systems in a changing climate requires more than setting extraction limits. It demands realistic accounting for reduced water availability, protection of the small streams that sustain the whole network, and genuine partnership with the Traditional Owners who hold the deepest long-term knowledge of these landscapes. Without that shift, the discoveries emerging from Europe’s riverbeds risk becoming a preview of what Australia’s own waterways may reveal in the years ahead.
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