Damage Function

Definition

Damage functions are used to represent the relation between the maximal damage and the damage factor.

Context

The experience gained from former flood events has shown, that there is a relation between flow depth or rather velocity and the expected loss. Normally, floods cause damages only in cellar and ground floor. This is why it doesn’t make sense to calculate damage arising in the whole building. Therefore a function/factor is needed which reduce the asset value of the appropriate land use type to the amount of actually expected loss.

Methodology - using the example of Germany and the Netherlands

In Germany damage functions are available. These functions represent the relation between hydraulic parameters (water depth) and damage (vulnerability). They give information on the amount of damage in percent for different water depths while considering the respective land use type. The determination of expected losses on agricultural or forestal used land is less detailed. Often the factors differ from zero, zero point five to one.

In other countries, like for example in Switzerland or Austria, there are also factors available derived from real damages and/or datasets from insurances which describe the vulnerability of buildings or other land use types in dependency on the impact (flow depth, velocity, pressure).


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Module
Flood risk mapping
Source

TUHH

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Further Information

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