Estimating Direct and Indirect Damages from Storm Surges: The Case of Hamburg—Wilhelmsburg

This paper estimates the economic costs from storm surge scenarios in the Free and Hanseatic City of Hamburg. Hydrodynamic and damage models simulate the direct damages to residential and commercial buildings and equipment in a part of the city named Hamburg-Wilhelmsburg. They are assigned to individual economic sectors and then integrated into an economic model. This model accounts for the indirect impacts due to the interruption of production processes. Furthermore, the indirect costs are allocated to the flooded and non-flooded area in the whole city of Hamburg and then to each firm according to its relative size. Thus, the spatial distribution of indirect damages can be visualized. The approach is a helpful tool to simulate potential total damages from storm surge scenarios at the city scale and can be used to assess the effectiveness of possible protection measures. The inclusion of indirect costs into flood risk mapping complements common risk mapping procedures.

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