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Urban flood risk management

Many cities and towns are situated in locations that are prone to fluvial flooding such as deltas and flood plains. Cities that are far away from water bodies prone can also be liable to pluvial flooding as a result of intense rainfall, often exacerbated by extensive land sealing and drainage networks with insufficient capacity. Urban floods affect infrastructure, assets and urban activities, including transport. They can cause health risks due to overflowing sewers and intrusion of surface water into water supply systems. Urban floods also increase the risk of pollution of water courses into which storm water and flood water drains.