The article discusses how flood risk can be different in areas with the same flood intensity due to varying vulnerability. The researchers used a new method to assess flood risk by combining flood hazard and vulnerability indices. They used a model to simulate flood depths and assessed elements at risk and damage functions for vulnerability. The study found that areas with different levels of flood risk don't always increase with higher flood return periods, but areas with different flood depths do. This approach successfully addresses the variability in flood risk even when the flood intensity remains the same.