Floods in megacities: impacts of urban growth, sustainable infrastructure and climate change

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Globally floods are one of the most devastating natural disasters, impacting numerous regions, responsible for thousands of casualties and billions of dollars in losses annually. All cities are becoming more vulnerable to flooding due to urbanisation, ageing infrastructure, and the increasing frequency and intensity of extreme weather events. In particular, megacities (cities with a population greater than 10 million) face even greater risks – the urban growth in these areas is faster than other regions and the number of people and economic assets affected in large centres is also far higher than anywhere else. It is therefore essential to develop better urban flood protection methods, including improved flood forecasting methods and effective flood mitigation infrastructure.