Can the right tyres get you through floodwater?

No — and this is the point that gets people killed. Deep tread, all-terrains and 4WD do not help once water enters the engine’s air intake or exhaust, or once the water is deep enough to lift the car. According to the NRMA, a typical car loses power in depths greater than 15cm, and cars can float once flood levels exceed 30cm. Moving water carries enormous force and often hides a road that has already washed away underneath. The SES message is blunt and correct: if it’s flooded, forget it. For the grip side of wet driving, see how aquaplaning works and how to recover.

How deep is too deep to drive?

Still water can be deceptively deep, and moving water only needs to be shallow to sweep a vehicle away. The Bureau of Meteorology and state emergency services publish wet-season guidance worth reading before you travel — the Bureau of Meteorology explains how quickly flooding develops. Always confirm current depths and road closures with your state road authority or SES.

Why worn tyres are dangerous in flood season — even on the road

The real tyre risk in the wet season is not the flood itself but the saturated roads around it: aquaplaning and long wet braking distances. Australia’s legal minimum tread is 1.5mm, but wet performance falls off well before that — many fitters suggest replacing around 3mm for wet safety. The first rain after a dry spell is the most slippery of all, as oil lifts off the road. If your tyres are getting low, read driving on wet roads with worn tyres and check your tyre wear indicators; our guide to the best tyres for a wet Queensland summer and the legal minimum tread depth will help you choose and stay compliant.

What should you check after driving through water?

If you have driven through even shallow water, tap the brakes gently afterwards to dry the rotors. Watch for a slow puncture from debris or hidden potholes — floods wreck road surfaces, so also scan for pothole damage to tyres and wheels. If water was deep enough to reach the door sills, do not restart the engine; call for assistance. Roadside assistance generally cannot help a vehicle in floodwater, and the damage becomes an insurance matter.

What should you do if you start to aquaplane?

Ease your foot off the accelerator, keep the steering wheel straight and do not brake hard or turn sharply — let the car slow and settle until the tyres regain contact. With ABS you can brake normally once grip returns; without it, pump the brakes lightly. Good tread clears water far better, which is the whole argument for not letting tyres get down near the legal limit — see when to replace your tyres.

How do you plan a wet-season drive so you’re not caught out?

In flood country, preparation beats improvisation. Before you travel, check the Bureau of Meteorology and your state road authority or SES for warnings and road closures, and have an alternate route in mind rather than committing to a single road. Make sure your tread, spare and wipers are up to the wet, and keep your pressures at the placard figure — dropping them does not help on wet sealed roads and slightly worsens aquaplaning resistance. If you reach water over the road, do not try to judge the depth from the driver’s seat; turn around and reroute. If rising water ever traps you, get out and to higher ground while you still can rather than staying with the vehicle. None of this is about having tougher tyres — it is about not putting any tyre into the water in the first place.

Frequently asked questions

How much water can float a car?

As a guide, the NRMA says cars can float once water exceeds about 30cm, and a typical car loses power beyond about 15cm. Moving water needs even less depth to sweep a vehicle away.

Do bigger or chunkier tyres help in floods?

No. Once water reaches the air intake or lifts the vehicle, tyre type is irrelevant. Larger tyres can even raise the body and make floating easier.

Is the road safe once the water recedes?

Not necessarily — the surface underneath may have washed out or hidden deep gullies. Treat a recently flooded road as damaged until you can see it is sound, and obey closures.

What tread depth do I need for the wet season?

Stay well above the 1.5mm legal minimum. Many fitters recommend replacing around 3mm because wet braking and aquaplaning resistance drop sharply as tread wears down.

Can I lower my tyre pressures to drive through a flooded road?

No. Lowering pressure does nothing to help in floodwater and reduces grip and stability on the wet sealed road afterwards. Keep pressures at the placard and simply do not enter floodwater.

Does comprehensive insurance cover flood-driving damage?

Often not, or only with conditions — many insurers reduce or refuse claims where a driver deliberately entered floodwater. This is general information, not advice; check your own policy and insurer. It is one more reason never to drive into a flooded road.