In this research vertical evacuation is defined as the displacement of people to dry floors in buildings or public shelters that are located inside the threatened or flooded area. Vertical evacuation strategies can be implemented in combination with, or as an alternative to, preventive evacuate in case preventive evacuation is not entirely possible (because the time available is insufficient) or desirable (because of the impact and probability of flooding in the warning phase). Research has shown that in some cases casualty estimates for vertical evacuation are lower than for preventive evacuation. This report describes the possibilities of vertical evacuation and compares them with preventive evacuation of areas prone to flooding. It gives requirements for successful vertical evacuation, conclusions and recommendations. (report in Dutch with 7 page summary in English)