UFM Cost C22 - Triggers

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Triggers

"Triggers" for renewed attention to Urban Flood Management
The dilemma: reduction of probability leads to increased vulnerability
Flood risk is usually described as a function of the probability of floods (return period) and the effect of a flood (damage caused by floods). Current policies and measures concerning flood risk management are predominantly based on the management of probabilities of floods (largely dominated by engineers) and not on reduction of impacts of floods.

The need for integrated solutions
Solutions aimed at reducing vulnerability to floods have to address both short and long term events. Climate change and change of land-use are gradual processes that require slow but continuous adaptation. Intense local precipitation or dike breaches or sudden and often unexpected, and result in acute impacts which require a vigilant flood accommodation and defence policy.

Policy context
Traditionally, flood management policies in were flood defence policies, dominated by construction of dikes. Flood events in the 1990s in the and have given rise to intense debate on the future direction of their flood management policies. It was realised that one hundred percent safety cannot be guaranteed; furthermore, one cannot raise dikes indefinitely.

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