Originally Posted By: Arney
That does remind me of one tidbit I heard mentioned at my CEPA class--after a large earthquake, turn off the water supply to your house.

Two reasons given: 1) Prevents contaminated water (e.g. broken sewer and water mains) from entering your home's water supply. 2) Prevents a drop in pressure in the municipal system, e.g. a water main break down the street, from siphoning the water out of your house's pipes.
In usual UK systems, 2 can't happen. The mains pipe empties above/into a cold water tank in the attic, and most of the house is fed from that. If the mains pipe goes in reverse, it will suck air, not water.

1 is a good reason, though.
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