No idea what causes this but it's awesome. Sorry if GC
(, Sat 3 Jan 2009, 13:57, Reply)
If there's a big downhill run of pipe, and it blocks or if the pipe levels out downstream of that manhole all the water backs up.
You've got the pressure from whatever height of water until the next manhole upstream - which sometimes is considerable!
It happens in the UK quite a lot, but I don't think ever quite as spectacularly as that.
(, Sat 3 Jan 2009, 14:25, Reply)
Also, it that the cover for the drain in front of the car at the end? If so that thing must weigh a bit, would be piss scary if you were driving and that happened
(, Sat 3 Jan 2009, 18:06, Reply)