. . .our water is all gravity feed - unless the disaster is something that breaks water mains . . .
How much pressure does the system have that water from the deep water mains gets to homes which are above them. There's gotta be a pump in the system somewhere.
It's the source elevation at the front of the pipeline that sets the pressure head of the line above grade. It doesn't matter how deep the pipe goes, so long as it doesn't have a vent anywhere below grade to break the siphon with. I believe most areas of NYC metro have a natural flow pressure unaided up to about 15 to 30 stories, depending on localized elevation. Above this, it usually requires a booster pump to keep the head up.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
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