The Metropolitan Area Outer Underground Discharge Channel

  • Kasukabe

The Metropolitan Area Outer Underground Discharge Channel

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The Metropolitan Area Outer Underground Discharge Channel is one of the world's largest underground discharge channels, which takes water overflow undergound from small- to mid-size rivers such as the Naka, Kuramatsu and Oootoshifurutone and directs it to the Edo River through a 6.3 kilometers long tunnel that runs 50 meters below ground. Construction started in March 1993 utilizing world-class Japanese civil engineering technologies. After a construction period of 13 years, in June 2006 it became possible to direct water from the Oootoshifurutone River into the Edo River. 

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