Flooded Basement
Flooding can DEFINETELY disloge or even toss those heavy cast iron
manhole covers a LONG WAY. I have seen it happen!
Also have seen a jet of water several feet in the air coming from a
missing manhole.
All the water upstream moves down a too small pipe and looks for a way
out
Think about it, water turns turbines to generate electricity, tossing a
manhole cover is a minor event
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