The Kanto Flood Hazard Map app provides flood risk areas in the Kanto region (Ibaraki, Tochigi, Gunma, Saitama, Chiba, Tokyo, Kanagawa) and approximately 126,000 evacuation sites nationwide. It allows users to search for the estimated maximum flooding depth at their current location or any designated point, along with the nearest evacuation site and its evacuation route. Both flood risk areas and evacuation sites are based on data from the 24th year of the Heisei era. It's a valuable tool for those unfamiliar with an area or for disaster response tabletop exercises.

The app is not intended for use during emergencies but rather for pre-disaster preparation and tabletop exercises. It's recommended to verify evacuation site information separately in case designated shelters are unavailable during emergencies. The app features a map with a central scope showing the estimated flooding depth and address as the map moves. Users can access detailed information by tapping on evacuation site icons on the screen.