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Storm Surge Defences

Many areas considered to be at risk of surges are protected by flood defences, either in the form of permanent sea walls or by mobile barriers which can be closed when storms are predicted. Examples include:

However these defences cannot always be relied on, as extreme storm surges can overwhelm defences catastrophically. Moreover, in the case of mobile defences there must be sufficient warning to have the barriers in place. (This warning must also be reliable, since raising defences unnecessarily carries a cost.) So even where defences exist, accurate forecasting is key to mitigating storm surges.

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