G-cans

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The G-Cans under Kasukabe ( Saitama prefecture )
Central control room

Coordinates: 35 ° 59 '50.3 "  N , 139 ° 48' 41.3"  O The abbreviation G-Cans denotes the Shutoken Gaikaku Hōsuiro ( jap. 首都圏外郭放水路 , dt as "outer drainage channel for the. Metropolitan area “, English Metropolitan Area Outer Underground Discharge Channel ), the world 's largest underground drainage and sewerage system under National Road 16 near the city of Kasukabe in Saitama Prefecture north of Tokyo .

It is intended to buffer and discharge the water volumes that arise primarily during the passage of typhoons . The construction work began in 1992 and lasted 15 years, the construction costs amounted to more than 2 billion euros.

At a depth of 50 m below the surface of the earth, there are five huge concrete caverns 65 meters high and 32 meters wide. With their 59 mighty pillars, these underground water reservoirs form gigantic halls that are reminiscent of the architecture of cathedrals. The five concrete buckets are connected by more than 60 km of underground tunnels with a diameter of up to 10 meters. Since even these enormous water reservoirs can reach the limits of their capacity due to the heavy rainfall and the associated flooding, a pump system ensures that the water is transported away into the Edogawa River , which flows into the Pacific. With a pump output of 10 MW, 200 t of water per second can be pumped out of the city into the river in this way.

During the dry season, the underground water reservoirs attract large groups of tourists who want to see the impressive architecture up close.

Web links

Individual evidence

  1. ↑ a b c Axel Bojanowski : Typhoon protection in Tokyo: Underground cathedrals collect rain floods. In: Spiegel Online. September 21, 2011, accessed September 21, 2011 .
  2. ↑ Ines Hielscher: Tokyo Taifunschutz: The water's Cathedral. In: Spiegel Online. August 24, 2017. Retrieved August 25, 2017 .