Europe's Rivers Are Drying Up: Can They Be Saved?

Europe's summer of climate-driven crises has taken a new turn with rivers experiencing unprecedented levels of dryness. The Rhine, Danube, and Po rivers have all seen historically low levels, raising concerns over freight transport, the economy, and agriculture. Farmers warn of rising costs due to poor harvests, while cargo and cruise ships cannot pass in some areas of the Danube. Sunken ships and cars have emerged as riverbeds dry out, leaving behind submerged ruins.

The drought is worsened by global warming caused by burning fossil fuels, leading to low water levels and impacting ecosystems. Parched fields, lost harvests, and exposed riverbeds are just the visible consequences, but underwater ecosystems are also suffering. As water levels decrease, rivers warm and contain less oxygen, putting fish at risk of dying off. Mussel populations, crucial food sources for fish, are dying off due to drying gravel banks and increased temperatures.

Drought combined with high nutrient loads from agricultural fertilizers encourages harmful algal blooms, which were seen on the Oder River in eastern Germany in 2022, leading to the death of thousands of fish. Experts do not expect a repeat of the Oder disaster on the Rhine this summer, but the danger to freshwater ecosystems remains.

Germany's drinking water is largely sourced from riverbank filtration, which is weakened by drought and leads to increased pollutant concentrations in water. Additional treatment is needed to provide clean drinking water, potentially raising costs by up to 30%. German industry groups estimate additional investments of up to €14 billion may be needed for better water treatment systems, deeper mains, and upgraded reservoirs to keep water temperatures low and limit microbial growth.

The crisis has also highlighted the disparity in water abstraction fees, with several industries exempt from fees in many German states. Some German cities are restricting withdrawals from streams and rivers to conserve water, with fines of up to €50,000 for violations. Low water levels are already hurting the economy, with vessels carrying only a fifth of their usual cargo and causing price increases in the steel, chemical, and petroleum industries.

The energy sector is also under pressure, with Hungary considering an energy crisis after the shutdown of a nuclear power plant due to low water levels.

Politicians are exploring emergency measures, such as deepening parts of the Rhine's navigation channel to allow shipping, but critics argue that this could lead to further damage to the environment. Instead, they advocate for the development of ships with shallower drafts, expanding the use of low-water vessels, and shifting freight transport to rail. Restoring floodplains and protecting Europe's heavily modified rivers could also help address the crisis in the long term.