Risk classification

An international comparison shows that the standards for risk assessment differ from country to country. There are neither the same standards for assessment nor a corporate design for visualising risk on a map.

The definition of risk, the determination of the relevant probability of occurrence and the classification according to the intensity of damage depend on the following characteristics:

- Triggering event (flood (fluvial, tidal) / flash flood / debris flow, groundwater or other natural phenomena)

- Relevant criteria (flow depth, energy height, velocity, pressure, deposition height)

- Characteristics of the project area (land use type, population density)

 

In spite of the big differences related to the classification of low, medium or high risk the definition of the design flood event is quite similar in the most European countries 

Country

Design Event

United Kingdom

1/100 (fluvial), 1/200 (tidal)

Germany

1/100

Austria

1/100, 1/150 (torrential catchments)

Switzerland

1/100 1/300

 

 

 


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Module
Flood Risk Assessment
Source

TUHH

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