Technically; the distance from the floor to the air intake.

Sensibility; the distance from the floor to the bottom of the air intake box or roughly no more than 1/2 the height of the wheels.

If the water level is even deeper than that, maybe approx. up to 3/4 wheel height is the absolute max ( I'd guess on the Formentor - just because it's raised a little ) you should be crawling forward, driving at a slow consistent speed behind the bow wave.

The key point is even if the water level isn't that high, driving at a speed whereby the water rushes over the top of the bonnet is a hydro-locking death sentence for most cars.
 
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Technically; the distance from the floor to the air intake.

Sensibility; the distance from the floor to the bottom of the air intake box or roughly no more than 1/2 the height of the wheels.

If the water level is even deeper than that, maybe approx. up to 3/4 wheel height is the absolute max ( I'd guess on the Formentor - just because it's raised a little ) you should be crawling forward, driving at a slow consistent speed behind the bow wave.

The key point is even if the water level isn't that high, driving at a speed whereby the water rushes over the top of the bonnet is a hydro-locking death sentence for most cars.
And hope no one coming the other way too fast does not create a wave which the floods your car, like happened to my mate a few years back.
 
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