Overview of Facilities


























Visitor Infomation
Guided Tour (Course Details How to apply)[外部サイト]
We offer tours to the Metropolitan Outer Area Underground Discharge Channel to the general public. For reservations, please visit the website of Reservation Desk (reservation is required).
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Overview of Facilities
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Why were the Nakagawa, and Ayase River basins Repeatedly Devastated by Rain-related Flooding ?
Being surrounded by large rivers like the Tone, Edogawa and Arakawa Rivers, it has topography like a bowl that easily accumulate water.
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About the Metropolitan Outer Area Underground Discharge Channel
One of the world's largest underground discharge channels at 50 meters below ground.
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Shaft
"Inflow facilities" and "Shafts" for taking water from the rivers
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Tunnel
This is an "underground river" constructed to lead flood water flowing in from the Nakagawa, Kuramatsu, Ootoshi-Furutone Rivers and others to the Edogawa River....
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Pressure-Adjusting Water Tank
This is a facility that ensures the smooth flow of water to the Edogawa River by reducing the momentum of the water from the underground tunnel.
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Draining pump station
"Drain pump", "Operation Room" and "Drainage sluiceway" for draining flooding from underground areas.
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Flood Control Effects of The Metropolitan Outer Area Underground Discharge Channel
The Metropolitan Outer Area Underground Discharge Channel is making a significant contribution in reducing damages due to immersion in the Nakagawa River and Ay...
Pamphlets
Large Underground Discharge Channels Provide Safety and Reassurance for People Living in the Metropolitan Area