Arakawa basin wide area evacuation 5 wards in the eastern part of Tokyo

In five wards in the eastern part of Tokyo, Arakawa basin, typhoon No. 19 last month examined a wide area evacuation targeting over 1 million residents, but it was voluntary due to conditions such as planned suspension of railways. I decided to postpone the evacuation call. The five wards will continue to verify issues and review plans for the implementation of wide-area evacuation.

Edogawa Ward, Koto Ward, Sumida Ward, Adachi Ward, and the five wards of Tokyo in the basins of Arakawa and Edogawa in Katsushika Ward have many "zero-meter zones above sea level" and are large due to floods and storm surges. It is assumed that inundation will occur.

Approximately 2.5 million people live in this area, and in five wards, discussions were held on “wide area evacuation” to evacuate to local governments outside the ward, and a plan for wide area evacuation was announced last August.

According to the plan, if a typhoon with a central pressure of 930 hectopascals could hit Tokyo, voluntary wide-area evacuation was called in 72 hours ago, and five districts jointly started 24 hours ago depending on the amount of rain. I decided to issue a "wide area evacuation advisory".

In the case of Typhoon No. 19 that struck Tokyo etc. from 12th to 13th last month, the five wards started to examine by the person in charge from the 11th of the previous day, but in the prediction of the amount of rain initially provided by the Japan Meteorological Agency The forecast for the amount of rain for three days was less than 400 mm, and it did not reach 600 mm calling for a wide area evacuation recommendation.

After that, the information from the Japan Meteorological Agency reached the standard for calling for voluntary wide-area evacuation, with the forecast of the amount of rain for three days exceeding 500 millimeters, after 7 am on the 12th. Since the start was coming a few hours later, the call for wide area evacuation was postponed again to avoid confusion caused by evacuation.

General Manager Yoshinari Honda of the Edogawa Ward Disaster Management Crisis Management Division said, “Since the rain did not reach the evacuation standards of the wide-area evacuation recommendation, we refrained from wide-area evacuation. As a result, it was judged that there were people who could not evacuate due to the concentration of people at the station or the concentration of cars on the bridge by transmitting information. "

In the future, the five wards will verify with relevant organizations and review the plan, including the criteria for determining the amount of rain from the Japan Meteorological Agency and the assumption of the timeline for evacuation, for the appropriate implementation of wide-area evacuation. I want to go ahead.

With wide area refuge of Koto 5 ward

In Edogawa Ward, Koto Ward, Sumida Ward, Adachi Ward, and Katsushika Ward, 2.5 million people, more than 90% of the population of approximately 2.6 million, live in areas where floor inundation is expected.

The “Koto 5 Ward Large Flood Disaster Evacuation Plan” formulated in August of last year is based on the assumption of the scale and damage of the Muroto Typhoon in 1945 and the Kaslein Typhoon in 1947, and is an area where flooding is expected. Targeting residents for wide area evacuation, the 5 wards will jointly provide information on wide area evacuation.

According to it, if the forecast circle of typhoons with central pressure of 930 hectopascals is predicted to include Tokyo, or if it is predicted that the rainfall in the Arakawa basin may exceed 500 mm for three days, flooding The head of the 5th district calls for voluntary wide-area evacuation from 72 hours before the outbreak is expected.

And if it is predicted that the rainfall for three days in the basin may exceed 600 mm from 24 hours before the occurrence of the flood, the “Wide Area Evacuation Advisory” calling on residents to evacuate outside the 5 wards It is said that the mayor of the joint will issue.

After the “Wide Area Evacuation Advisory” is issued, the residents are urged to evacuate on foot or using public transportation in principle to avoid traffic congestion.