Visited these museums to learn more about Tokyo's water infrastructure.
While most of the exhibits at the museums were aimed at kids. I did learn a lot about how Tokyo manages their clean water and sewage. It was very impressive. Like most cities, they have many pipes that need to be replaced. Instead of digging them up, they developed a proprietary way to reline the pipes called the SPR Method. It works on all shapes of pipe from small to large diameter.
I learned why manhole covers are round and how to decipher the numbers on the cover and how Tokyo is planning for sewage services during a bit earthquake. Manholes with a small blue symbol can be used as emergency toilets. There are several like this in the Hikarigaoka park close to where I live.
They are implementing separate storm and building sewers along advanced treatment plants through out the 23 wards of Tokyo. They burn the sewage sludge and turn the left over ash into concrete. They even turned their oldest sewage facility and pipe from 1885 into a designated historical site. I suspect that would never happen in the US :).
The Tokyo water supply system started over 400 years ago with the Tamagawa Aqueduct and is one of the largest and most resilient water systems in the world today.
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