Following the amendment of the Flood Control Act in May 2015, the Tokyo Metropolitan Government published a map of areas expected to be flooded by storm surges along the Tokyo Bay coast (Tokyo section) in March 2018.

We are pleased to announce that the map has been revised in response to the national government’s revision of the “Guidelines for Creating Maps of Expected Areas Flooded by Storm Surge” in June 2020.

1. Overview of the map of areas expected to be flooded by storm surges [pre-revision in brackets]

Wards expected to be flooded

17 wards (17 wards)

Area of ​​areas expected to be flooded

Approximately 184 square kilometers (approximately 212 square kilometers)

Population in areas expected to be flooded

Approximately 3.7 million people (approximately 3.95 million people)

Duration of flooding

One week or more (one week or more)

2. Where to view

The map of areas expected to be flooded by storm surges can be viewed at the following locations and on the website.

Tokyo Metropolitan Government Port and Harbor Bureau Port Development Division (Tokyo Metropolitan Government Second Building, 8th floor)

Tokyo Metropolitan Government Construction Bureau River Department (Tokyo Metropolitan Government Second Building, 6th floor)

Tokyo Metropolitan Government Citizens Information Room (Tokyo Metropolitan Government First Building, 3rd floor, south side)

Port and Harbor Bureau website

Construction Bureau website

Contact information
Port and Harbor Bureau Port Development Department Planning Division
Tel: 03-5320-5608
Construction Bureau River Department Disaster Prevention Division
Tel: 03-5320-5190