Colossal Japanese Storm Sewer System
Tuesday, July 8th, 2008
The city of Saitama Japan started construction of its colossal storm sewer system in 1992 and is now open for tours. The extensive system was built to avoid city-wide flooding during the typhoon season and is composed of giant concrete silos (65m tall and 32m wide) connected by 6.4km of underground tunnels. Extending 50m below the surface, the system also contains a giant tank that is 25.4m tall, 177m long, 78m wide and a total of 59 concrete columns.



