Flood hazard map

　Hazard maps of floods, inland waters, and high tides are compiled as "Inundation Hazard Map".
　Please also check the information on the inland water hazard map and high tides hazard map information.

As of June 1, 2022 We released flood hazard map of 15 wards of the city (other than Kanagawa Ward, Kanazawa Ward, Sakae Ward)　※There is no change in the inundation area.
[August 12, 2021] In the Kanagawa Ward Hazard Map, there was an error (Koyasu Elementary School) in the location of the elementary school.
[June 28, 2021] Hazard maps for Kanagawa Ward and Kanazawa Ward have been updated.
[September 18, 2020] Information pages for hazard maps of Tsurumi Ward, Kohoku Ward, Midori Ward, Aoba Ward and Tsuzuki Ward   have been updated. (There is no change in the inundation area on the map surface.)

Based on 　the Flood Control Law (Article 15 of the Flood Control Law, Article 11 of the Enforcement Regulations of the Act), in order to ensure smooth and prompt evacuation in the event of a flood, flooding occurs when a river overflows due to the largest possible rainfall Information such as evacuation shelters is displayed in the flood inundation area map that displays the expected flood inundation area and the assumed water depth.

　My Timeline is your own evacuation action plan that has been organized in chronological order in advance according to the family structure and local environment of each person in response to disasters that may occur in the future, such as typhoons and heavy rain floods.
Check the hazard map and create a personal timeline for each person.
◎About my timeline (Yokohama-shi homepage)

• About inundation from sewer or waterway,Inland water hazard mapPlease refer to the following URL.
• If you cannot read the flood hazard map, please see the paper map at the General Affairs Division of the relevant ward office or the City Hall 3F Citizen Information Center.
• If you want to see the whole city area, please.Waiwai disaster prevention map (outside site)You can view it from here.
• Regarding the water level of the riverPage (outside site) of Yokohama-shi water disaster prevention informationPlease take a look at it.
• Disaster in Yokohama City(You can check the flood history etc. here.)
• FAQs
• For foreign people (people), you can see easy Japanese (Japanese) information.⇒Flood Hazard Map Information Area (Easy Japanese) (PDF: 380KB)

If it is difficult to see due to the resolution, you can enter Address etc. from the disaster prevention map (external site) to enlarge the area and view it.

• Flood hazard map information side (common) (PDF: 2,744KB)

・　 Page (River water level information) of Yokohama-shi water disaster information (outside site)
・　 Earth and sand disaster hazard map
・　 Past disaster history
・　Inundation hazard map