The last national stakeholder workshop for the Wupper research site took place on 11.06.2019 at the Wupper Association, where the final BINGO-Project results were successfully disseminated. First, Marc Scheibel (Wupper Association) presented an overview of the BINGO-Project and the main results of all research sites. He finished his presentation by introducing the main outcomes for the Wupper research site, for both case studies “too much water” for the Mirke Creek in the city of Wuppertal and “not enough water” for raw water availability at the Große Dhünn Reservoir. This included the importance of finer resolution of climate data used as input for the hydrological models in order to capture flash floods accurately as well as the trend of the next decade for the Große Dhünn Reservoir (all climate scenarios show a decreasing trend in reservoir volume at the end of 2024).
Next, Clemens Strehl (IWW) presented the methodology and data used for the analysis of the adaptation measures for both case studies and main results. For the case study “not enough water”, various adaptation measures were simulated and evaluated. The investigated non-structural adaptation measures show that they are capable to reduce the future risk of water scarcity considerably. The reduction of low water augmentation turns out to be the measure with the best cost-effectiveness. For the case study “too much water”, the presentation focused on the comparison of three technical flood risk reduction measures (line protection, retention basin, and property protection). According to the results, the retention basin offers the greatest annual net benefit in terms of expectable flood damage reduction. However, smaller measures (e.g., property protection) offer a better cost-effectiveness in terms of non-monetary benefit (i.e., less people affected and less sensitive objects).
Model uncertainty and climate data applications in hydrology were discussed together with Uwe Ulbrich (FU-Berlin), who highlighted the importance of appropriate interpretation as well as the capabilities of the climate models. Financing for the private adaptation measures was also an important discussion point since it involves sensitization of the affected community. It was suggested that the aim should be to inform the public about flood risks in their area in a straightforward way in order to raise awareness and enhance self-provision and self-motivated engagement for flood protection.
In conclusion, for the case study “too much water”, the city of Wuppertal will have to deal with a growing flood risk and risks need to be better communicated to the public. For the case study “not enough water”, the raw water availability from the Große Dhünn Reservoir might be at risk; thus, risk reduction measures should be implemented.
Finally, the workshop was assessed by the audience through evaluation questionnaires. The received feedback was very positive.