Drainage relies on air moving as freely as water. When a fixture drains, air has to enter the system behind it, and without a path for that air the draining water pulls a vacuum. The consequence is that traps get siphoned out, and a trap without its water seal no longer blocks sewer gas from entering the room.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
