Tokyo Metropolitan - Flood Control Integrated Information System (Bureau of Construction River Division) Provide

Disaster prevention information

• X（Old Twitter） Tokyo Disaster Preparedness (@tokyo_bousai)

Disaster weather information

• Disaster weather information (Japan Meteorological Agency)
• Warnings, alarms, special alarms for the city of Tokyo (Japan Weather Association)
• Disaster weather information (Japan Weather Association)
• Local information on disaster mitigation (Japan Meteorological Agency)

Rainfall and river water level information

• Tokyo Amesh (Tokyo Metropolitan Government Bureau of Sewerage)The rainfall condition in Tokyo can be understood via radar base station and ground rain gauges.
• River water level information (Ministry of Land, Infrastructure, Transport and Tourism)You can view the observation information of the disaster management water level gauge installed from 2018.
• Disaster information for Arakawa river (Arakawa River Downstream Management Office)You can view the observation information such as river water level of Arakawa river.
• Flood countermeasure information for Tama river, Tsurumi river, and Sagami river (Keihin River Office)You can view the observation information such as rainfall and river water level in the Tama river, Tsurumi river and Sagami river.
• Flood countermeasure information for Edogawa river, Nakagawa river, and Ayase river (Edogawa river office) You can view the observation information such as rainfall and river water level in the basin of the Edogawa river, Nakagawa river and Ayase river.
• Kanagawa prefecture Rainfall water level informationYou can view the rainfall amount, water level observation information and river surveillance camera images in various places in Kanagawa prefecture.
• Saitama prefecture River Flood InformationYou can view the rainfall amount, water level observation information and river surveillance camera images in various places in Saitama prefecture.
• Chiba prefecture Rainfall water level informationYou can view the rainfall amount and water level observation information in various places in Chiba prefecture.

Flood hazard map

• Flood hazard map (Tokyo Metropolitan Gov., Bureau of Construction)Flood hazard maps published in each municipality are also available from the municipalities' disaster prevention weather information links.

Municipalities’ disaster prevention weather information