Sinkhole: You have got to be $hitting me!!!

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Don't most of the major cities (at least all those near major waterways/lakes/oceans) have a similar drainage/overflow system dug under their cities? I know I've seen several highlighted on Discovery at one point or another, maybe History channel too.
 
My town Osaka also has such a drainage/overflow system.
It is a canal since the 17th century
I love it though.
 

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We have the Deep Tunnel here in Chicago. Not as fancy as the one in Japan but it is a huge system that took decades to build. I know a lot of people that worked on it. The green shaded area in the map is the Chicago city limits to give you an idea of the extent of the system.
 

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Yeah, that looks familiar....I think the Chicago network was on the show. Dang, wish I could remember which program it was on, I could look it up!
 
Sounds familiar. Is that the show where the guy goes to a different city/ruin every episode, and explores the sewers/basements/built-over ruins?
 
That hole is gapingly huge, and seriously dark; hence hinting at a larger underground cavern as similarily pointed out earlier. I think the next couple of blocks in radius should move somewhere else, before the rest of the flange/lip falls in.

The Tokyo anti flood system looks very impressive (as does the Chicago one too), as for earthquakes, hopefully its deep enough that should it collapse, it wouldn't cause much subsidance; otherwise post large quake, there would be some new river courses/beds/routes. I assume it's designed to withstand upto a guesstimate of say around 3.6R?
 
Thanks for your care, razor1uk.
Though I am not sure what the '3.6R' means exactly, the Tokyo facility is said designed expecting a seismic intensity of 7 (1,500Gal.) of the future earthquake. The radius of underground tunnel is said 5.0 meters.
980Gal. = 1G
Thanks!
 
Arigatto Shinpachi, by R i was trying to mean (R)ichter Scale. G? (G)iant Galllon? :/ ?? Certainly as long as there's some water in the system, that will have a dampening effect to any quake, but the any surging in the tank would creat some additional stresses. But since its upto around 7.0 resistance, it should be ok
 
G for Gravity, sir.
R for Richter Scale seems a synonym of M for Magnitude.
I am not informed of its value for the facility at the moment.
Thanks for your kind lecture, razor1uk
 
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