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Abstract

Urban flash floods caused by heavy convective precipitation pose an increasing threat to communes world- wide due to the increasing intensity and frequency of convective precipitation in a changing climate. Thus, flood risk management plans adapted to the current flood risk but also capable of managing future risks are of high importance to mitigate flood damages and risks. These plans necessarily need model based pluvial flood risk simulations in order to plan and implement appropriate and cost-effective flood risk management strate - gies. In an urban environment these simulations have to have a high spatial and temporal resolution in order to implement street and even block-specific management solutions, but also to be capable of simulating the flooding caused by spatially and temporal highly variable rainfall. Moreover, the effect of the sewer systems has to be included to achieve realistic inundation simulations, but also to assess the effectiveness of the sewer system and its fitness to future changes of the pluvial hazard. The setup of these models, however, typically re- quires a large amount of input data, a high degree of modelling expertise, a long time for setting up the model, and to finally run the simulations. Because of high costs associated with classical detailed urban hydrodynamic models, not all communes can afford such engineering services. Also, many consultancies cannot offer scala- ble solutions for large scales. This calls for a hydraulic model and a modelling approach, that is time efficient in both model setup and simulation runtimes, and that can be easily transferred to all communes in Germany. The hydraulic model RIM2D was developed within HI-CAM to fulfil these requirements