The city of Saitama, Japan went to great lengths, and depths, to avoid typhoon season flooding. They built an extremely large and impressive storm sewer system starting in 1992. It's composed of giant concrete silos (65m tall, 32m wide) connected by 6.4km of underground tunnels 50m below the surface. It also has a giant tank: 25.4m tall, 177m long and 78 wide, with 59 concrete columns.
Via: Just Whatever blog
Earthquake, tsunami,
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