Drivers had completed the second of the three wet qualifying sessions, with the quickest 10 drivers waiting to complete the starting grid.
Organisers ordered a 10-minute delay, which then extended to half an hour.
"The problem round here is there are rivers which form across the circuit," said Red Bull principal Christian Horner. "Once the car aquaplanes, you're just a passenger. It's safety above everything."
(Writing by Alan Baldwin in London, editing by Clare Fallon)
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