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Flood hazard map

Last updated on June 1, 2022.

Explanation on the Flood Control Law (explanation of important matters, etc.)

Inundated hazard map

　Hazard maps for floods, inland waters and high tides are summarized in onehazard map.
　Please also check the information of the inland water hazard map and hazard map high tides along with the flood hazard map.

Update information

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

What is the Flood hazard map?

In accordance with 　the Flood Control Law (Article 15 of the Flood Control Law and Article 11 of the Enforcement Regulations of the Act), in order to ensure smooth and prompt evacuation during floods, inundation is expected when rivers are flooded due to rainfall of the largest possible scale, etc. Information on the refuge and other areas is shown in the Flood Inundation Area Map, which shows the estimated flood inundation area and assumed water depth.

Use the Flood hazard map to create a My Timeline (Evacuation Action Plan)!

　My Timeline is a self-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 rains.
Let's check hazard map and create a My Timeline for each person.
◎About my timeline (Yokohama-shi homepage)

Flood hazard map

Request for Use

For inundation from sewers and waterways, please refer to Inland Water hazard map.
If you are unable to view the flood hazard map, please see the paper map at the relevant ward office General Affairs Division or the City Hall 3F Citizen Information Center.
When we want to look at the whole city area, we can read from Wai Wai disaster prevention map (outside site).
Disasters in Yokohama City (Flood history, etc. can be confirmed here)
FAQs
For foreign people (people), you can see easy Japanese (Nihongo) information aspects (johomen). ⇒Flood hazard map Information (Easy Japanese) (PDF: 380KB)

Download of Flood hazard map

If it is difficult to see in terms of resolution, you can enter Address etc. from the Wai Wai Disaster Prevention Map (outside site) to enlarge the area and browse it.

Floods in each district hazard map　※　（）： Date of creation
Name of ward	Flood hazard map
Tsurumi Ward	○(May 2022) (PDF: 6,866KB)
Kanagawa Ward	○(June 2021) (PDF: 9,791KB)
Nishi Ward	○(May 2022) (PDF: 8,389KB)
Naka Ward	○(May 2022) (PDF: 7,854KB)
Minami Ward	○(May 2022) (PDF: 10,041KB)
Konan Ward	○(May 2022) (PDF: 9,591KB)
Hodogaya Ward	○(May 2022) (PDF: 10,325KB)
Asahi Ward	○(May 2022) (PDF: 7,188KB)
Isogo Ward	○(May 2022) (PDF: 9,383KB)
Kanazawa Ward	○(June 2021) (PDF: 7,992KB)
Kohoku Ward	○(May 2022) (PDF: 9,405KB)
Midori Ward	○(May 2022) (PDF: 9,354KB)
Aoba Ward	○(May 2022) (PDF: 7,750KB)
Tsuzuki Ward	○(May 2022) (PDF: 9,540KB)
Totsuka Ward	○(May 2022) (PDF: 7,117KB)
Sakae Ward	○(September 2021) (PDF: 8,569KB)
Izumi Ward	○(May 2022) (PDF: 8,936KB)
Seya Ward	○(May 2022) (PDF: 7,660KB)