Please click on the picture to start animation! You will see a part of a DTM, the corresponding landuse units and the extent of flooding.

Data sources

Before starting risk assessment the area of investigation has to be well defined and rainfall runoff modelling as well as hydraulic simulations have to be accomplished. Additionally, some economic pre-calculations like the determination of asset values have to be carried out.

Basis of each risk related consideration is the area of investigation as the size of this area determines the scale which is relevant for further analysis. Related to flood risk this area is normally smaller than a watershed which defines the catchment area. Mostly, the area of interest is the inundated area. But nevertheless data related to the catchment area are necessary for pre-processing. Therefore influences caused by floods can predominantly be analysed within the respective catchment area.

Essential basis data for pre-processing purposes (runoff modelling & hydraulic simulation) are:

  • the catchment area and topography,
  • the river system,
  • the land use and soil types,
  • precipitation data and corresponding water levels,
  • survey data or at least cross sections.

River System

Precipitation Distribution

Terrain model


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Flood Risk Assessment






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