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How rainy Tokyo tackles floods by building a “city” below the city

 TOKYO, Japan | Xinhua | RyuQkan is roughly a 30-minute walk from the Minami-sakurai railway station in Japan’s eastern Saitama Prefecture. It is a museum, which introduces the Metropolitan Outer Area Underground Discharge Channel, one of the world’s largest underground flood diversion systems. A stair with more than 110 steps leads …

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