The Metropolitan Area Outer Underground Discharge Channel is the world’s largest underground river which puts to use Japan’s cutting-edge engineering technology.
The main objective of this facility is to reduce the damage caused by regular flooding by diverting river overflow via a tunnel to this facility and channelling it into the Edogawa River. This is exactly what happened on Saturday, October 12th, 2019 when Typhoon Hagibis battered the Greater Tokyo Area. Not everyone was able to escape the wrath of the typhoon, however had this facility not exist, the damage may have turned out far worse.
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0:00 Highlights
0:39 Opening
0:49 About the facility
1:18 Descending underground
1:58 Pressure-adjusting water tank
3:18 Floodwater Intake Shaft 1
3:39 Draining Pump Station
3:49 Closing
Fifty metres beneath the teeming megacity of Tokyo is an underworld river system – 6.4km of tunnels, a colossal water tank, 59 massive 500 tonne pillars, giant pumps that remove 200 tonnes of floodwater every second. It’s an engineering marvel built to protect Tokyo against the increasing threat of flooding.
TOUR
Book a tour of the facility at
・ Water tank stair access only (approx. 100 steps).
・ There is no escalator/elevator access.
・ The tour is conducted in Japanese only. You must be
accompanied by a person/s proficient
in Japanese communication.
・ Interpretation services are not provided.
・ Wear comfortable non-slip shoes,
and clothes that you would not mind
getting dirty.
・ Large bags/luggage are not permitted in tour areas.
Baggage-minding service not provided.
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The KON’CHA! team is a small crew of 4 people dedicated to showing you all the fun things you can see & do while on your trip in Japan! We try to feature unique experiences that you may only find on Japanese travel blogs and websites.
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