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> In addition to this underground chamber, there are two massive pumps on either sides, which divert the water from whichever river is surging to the other (Arakawa & Edogawa possibly).

You probably mean pumping stations right? Usually single pumps don’t have that kind of flow rate. Just a nit pick though, your comment was really interesting!



I'm sorry, yes, two stations with huge pumps. They are like towers, but built from basement level downwards if that impression makes sense.


Yeah throughout the entire facility (several large chambers with large tunnels between them) there's something like eighty 10MW pumps to move water out of the chambers into the river.




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