Promotion of Service-Related Measures

In addition to steadily implementing infrastructure-related measures such as the construction of river control structures, the Bureau also takes service-related measures, including providing information on rainfall and river levels and broadening the public interest in and knowledge of rivers, to protect the lives and livelihoods of residents from disasters such as heavy rains, floods, storm surges, and landslides.

Providing River-Related Information

Providing Information via the Internet and Other Means

On the website of the Tokyo Metropolitan Government Integrated Flood Prevention Information System, the TMG provides information concerning flood warnings, including rainfall, river levels, and flood forecasts.

Information on flood warnings is also provided via Twitter.

Tokyo Metropolitan Government Integrated Flood Prevention
Information System


Mobile phone site

The TMG’s Twitter account for flood warnings


Issuance of Flood Forecasts and Other Information

The TMG, jointly with the Japan Meteorological Agency, issues flood forecasts for the Kandagawa, Shibakawa/Shin-Shibakawa, Megurogawa, and Shibuyagawa/Furukawa rivers, to warn of the danger of an overflow.

Publication of Flood Risk Maps

The Bureau creates and publicizes flood risk maps so that municipalities and residents can better prepare for potential floods.

Listing of regional flood predictions

Broadening the Public Interest in and Knowledge of Rivers

The Bureau implements various measures to increase residents’ interest in rivers and make them more aware of the dangers of floods, sediment disaster, and water accidents.

In July, which is designated as River Month, a wide range of events are held every year, including riverside walking tours, study tours to river control facilities, trash pickup events, exhibitions, photo contests, and symposiums.

Riverside walking tour (Tamagawa River in Okutama Town)


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