Floods are the most common natural hazard, accounting for 43% of hazard events from 1995 to 2015 and affecting 2.3 billion people.1 Already, urban flooding poses significant social and economic risks to cities around the world. They have caused more than USD 1 trillion in economic damage since 1980,2 and most cities (91% of C40 member cities) are impacted by them. Climate change is making this situation worse: by 2030, the number of people affected will have doubled compared to 2010.3
Cities are vulnerable to flooding not only because of their proximity to rivers, lakes and seas. Urban development has failed to safely and sustainably integrate water systems into urban space. This video explains how cities can address this to better manage urban flood risk.