Storm sewer system of Tokyo - flood protection Bashny.Net

Located in the outskirts of Tokyo, behind a small government building, underneath a soccer field and skateparks, is an incredible sewer storm system built to protect 13 million residents from heavy rain and tropical storm floods. The official name of these long, underground tunnels is the “Outer Underground Discharge Channel of the city territory with suburbs ”, but usually referred to as the G-Bank. Built between 1992 and 2006 for $3 billion, this huge collector includes 6.4 km of tunnel up to 50 metres, connecting 5 giant silos, 65 meters tall and 32 meters wide to one massive tank – the Temple (The Tample).









“Underground Temple” is the most impressive part of the G-Bank, which was used as background in various movies and dramas. This giant metal tank with dimensions of 25.4 177 78 59 meters supported by giant pillars. The flow of water from waterways in the city going through tunnels in the bunkers. When they are filled, the water from the bins makes its way through a series of tunnels in the massive “Underground Temple”. From there, four turbines powered by jet engines, pump 200 cubic meters of water per second into the Edo River.





The usefulness of such a colossal system of drainage has been discussed by experts. According to the Central Council for disaster management Tokyo, if the shower is 550 millimeters longer than three days will be fought in Tokyo, forcing the river Uracoa out of its banks, up to 97 metro stations would be flooded. This event occurs only once in 200 years, but in this case, the G-Bank will help to avoid a major disaster.









Project G-Bank is an incredible technical feat, at the same time amazingly beautiful. So it became an exciting tourist attraction in Tokyo. When not flooded, tours are held twice a day from Tuesday to Friday. Unfortunately, the tour is only in Japanese.





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