Flash floods could cause disasters in UK cities - it's time for a drainage revolution

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Flash floods could cause disasters in UK cities - it's time for a drainage revolution
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“The city starts to grind to a halt. Then the power goes out. It’s dark, and water starts coming into thousands of homes. In parts of the city it pours into basements, where it’s several feet deep, and people start to drown. This nightmare could happen.”

. Traditional flood defences like levees and sea walls are less relevant in these instances. Fundamentally, our ageing town and city sewer networks were not built to cope with monsoon-like conditions and they need to improve.Mr Laister explains the UK has long designed its drainage systems “for long-duration, low-intensity rainfall, typical of winter. What we are seeing now is more short, sharp, intense rainfall, typical of summer.

Surface-water flooding tends to be “short and shallow”, lasting less time than river flooding and not reaching the same depths. This means that it is easier for homeowners in high-risk areas to make effective adaptations.

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