How rainy Tokyo tackles floods by building a “city” below the city
It is a museum, which introduces the Metropolitan Outer Area Underground Discharge Channel, one of the world’s largest underground flood diversion systems. Surrounded by large rivers such as the Tone River, Edogawa River and Arakawa River, the area becomes a bowl-shaped basin where water easily accumulates. The Metropolitan Outer Area Underground Discharge Channel is part of Tokyo’s comprehensive measures to tackle floods. The Tokyo Megalopolis Region, or Greater Tokyo Area, made up of Tokyo and the three neighboring prefectures of Saitama, Chiba, and Kanagawa, is crisscrossed with rivers and streams, and to the south it borders Tokyo Bay by the Pacific Ocean. 7 and the Shirako River underground regulating reservoirs.
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