Metropolitan Area Outer Underground Discharge Channel

The Metropolitan Area Outer Underground Discharge Channel (Japanese: 首都圏外郭放水路, Hepburn: 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.[1] It is located between Showa and Kasukabe in Saitama prefecture, on the outskirts of the city of Tokyo in the Greater Tokyo Area.

Pressure control water tank

Work on the project started in 1992 and was completed by early 2006.[2][3] It consists of five concrete containment silos with heights of 65 m and diameters of 32 m, connected by 6.4 km of tunnels, 50 m beneath the surface, as well as a large water tank with a height of 25.4 m, with a length of 177 m, with a width of 78 m, and with 59 massive pillars connected to 78 10 MW (13,000 hp) pumps that can pump up to 200 tons of water into the Edo River per second.[4]

Central control room

See also

References
  1. "Metropolitan Area Outer Underground Discharge Channel". Archived from the original on September 14, 2018. Retrieved January 10, 2015.
  2. "CNN How giant tunnels protect Tokyo from flood threat". November 2012.
  3. "G-Cans: Tokyo's Massive Underground Storm Drain".
  4. "G-Cans Project, Kasukabe, Saitama, Greater Tokyo Area, Japan". Retrieved 10 January 2015

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