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The Metropolitan Area Outer Underground Discharge Channel (首都圏外郭放水路 shutoken gaikaku hōsuiro), is an underground water infrastructure project in Kasukabe, Saitama, Japan. It is the world’s largest underground flood water diversion facility, built to mitigate overflowing of the city’s major waterways and rivers during rain and typhoon seasons.
Reference : Metropolitan Area Outer Underground Discharge Channel – Wikipedia, the free encyclopedia