Don’t drive into flood water that’s moving or more than 4 inches deep.
Bear in mind that water levels can change quickly.If you’re driving and get trapped in flood water: It’s usually best to stay in the car and call for help.
Only get out if the water’s still and shallow, if you can see the bottom and there’s dry land nearby.

If your car somehow ends up in deep water, ideally open your door before the car goes in,  brace yourself – the airbags could go off when it hits the water, and the water will be cold.
Act quickly – don’t wait for the car to fill up or waste time trying to call for help.
The car may float for a short while – try to get out before it starts to sink.
Free yourself and your passengers from seatbelts and child seats.
The door will be hard to open because of the water pressure outside.
Electric windows should still work for a while – open one or more, and the sunroof if you’ve got one.
Help passengers escape through openings as quickly as possible.
Take your mobile with you if you can – it might still work and allow you to call for help.
Any floating objects you can take will help you when you’re in the water.