Deadly floods of 2021—Researchers identify gaps in hazard mapping

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Published: 2026-09-04T23:47:54.471Z • Permanent link

Researchers at the University of Potsdam, the Helmholtz Center for Environmental Research (HZERES), and the German Federal Institute for Geomorphology and Natural Hazards (BGR) have been investigating the causes and consequences of the devastating floods in Germany and Belgium in July 2021. The catastrophe, which claimed the lives of over 200 people, has highlighted the urgent need for improved hazard mapping and risk communication. Dr. Sven Rieckmann, a leading researcher in the field, has been studying the impact of extreme weather events on urban areas. He notes that the floods were caused by a combination of heavy rainfall and saturated soil, which overwhelmed the drainage systems in the affected regions.

The floods also had a significant impact on the global insurance industry, with many companies reporting significant losses. Swiss Re, for example, estimated that the floods caused over $1 billion in damages, while Allianz reported losses of over $500 million. The catastrophe has also raised concerns about the effectiveness of flood insurance policies and the need for more robust risk management strategies. The German government has promised to increase funding for flood protection measures and to improve hazard mapping and risk communication.

The investigation into the floods has also shed light on the role of climate change in exacerbating the disaster. Rising temperatures and changing precipitation patterns have increased the frequency and severity of extreme weather events, such as floods and heatwaves. The study found that the floods in 2021 were 30% more likely to occur due to climate change than they would have been without it. The findings have significant implications for policymakers and researchers, who must take into account the impact of climate change when developing strategies to mitigate and adapt to extreme weather events.

The floods in Germany and Belgium have significant implications for the global knowledge base of hazard mapping and risk communication. The catastrophe has highlighted the need for more accurate and reliable data on extreme weather events, which is critical for informing risk management strategies and developing effective mitigation measures. The study's findings have also raised concerns about the effectiveness of current flood insurance policies and the need for more robust risk management strategies. The German government's decision to increase funding for flood protection measures and to improve hazard mapping and risk communication is a step in the right direction, but more needs to be done to address the root causes of the disaster.

The floods have also had a significant impact on the research community, which must adapt to the changing landscape of extreme weather events. Researchers at the University of Potsdam and HZERES have been studying the impact of climate change on urban areas, and their findings have significant implications for policymakers and practitioners. The study's results have also highlighted the need for more interdisciplinary research, which brings together experts from fields such as meteorology, hydrology, and sociology to better understand the complex interactions between climate, society, and the environment. The research community must continue to prioritize the development of more accurate and reliable data on extreme weather events, which is critical for informing risk management strategies and developing effective mitigation measures.

The floods in Germany and Belgium are part of a larger pattern of extreme weather events that are becoming increasingly common in Europe and around the world. The European Union has been working to develop a more robust framework for managing extreme weather events, which includes improved hazard mapping and risk communication. The EU's Flood Risk Management Directive, which was adopted in 2007, sets out a framework for managing flood risks and reducing the impact of floods on communities. However, the directive has been criticized for being too slow to adapt to changing climate conditions, and for not doing enough to address the root causes of the disaster.