G-Cans project widely known as Tokyo underground flood tunnels is the networks of tunnels four miles long built deep under the ground in the Tokyo suburbs. This entire infrastructure is dedicated to prevent flooding when Tokyo metropolitan area rivers are overfilling during the rain seasons or in case of typhoons.
There is gigantic water tank 177 meters long and 22.4 meters high to keep water and then dump it to Edogawa River. 78 high powered pumps can pump up 200 tons of water per second.
This is an extreme flood prevention method that is a good idea in Tokyo as flooding there is a lot more common than in the UK. To build something like that in the UK would cost billions and flooding is just not s common.
The idea of the tunnels is very relevant, having somewhere much larger than the normal drainage system to allow for massive surges of flood water keeping the surface intact.
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