Top tips for driving in areas with floodwater

With recent weather in large parts of the UK being extremely wet, it’s likely that more of us than usual are facing floodwater on routes that are usually unaffected. The risk of driving through floodwaters is a significant concern. An alarming 74% of British drivers are willing to take the risk, even though just a shallow layer of water can cause a vehicle to float and potentially damage its engine. It's important to remember that only 30cm of water can lift a small car. 

Strategies for Flood-Prone Areas 

• For those residing in areas frequently affected by floods in the UK, being proactive and prepared is crucial. This includes planning for potential floods, adopting safe driving techniques during such events, and knowing how to react if caught in a flood.  
• Consider if your journey is necessary, and wait for better conditions if possible. 
• Choose routes that avoid known flood areas and share your travel plans with someone. 
• Keep your car well-maintained, including checks on windscreen wipers, fuel, and tyre tread depth. 

Practical Advice for Driving in Floodwaters 

• Encountering water on the road can be daunting. Here are key tips to minimise risks and handle floodwater driving safely. 
• Steer Clear of Deep Water: Stay away from standing or moving water deeper than 10cm (4 inches). 
• Reduce Speed and Maintain Distance: Lower your speed in wet conditions. Wet roads can double stopping distances, so keep a safe gap from the vehicle ahead. 
• Gear Selection: In manual cars, use the first gear to keep engine speed high. For automatics, select a low gear to prevent water from entering the exhaust and avoid stalling. 
• Consistent Driving: Drive slowly and steadily. The middle of the road is usually higher and can help keep water out of your car. 
• Brake Testing: After driving through water, test your brakes to make sure they're still effective. 
• Visibility is Key: Use dipped headlights for visibility, but avoid rear fog lights as they can dazzle other drivers. 
• Watch for Hidden Hazards: Floodwater can hide dangers like kerbs and open manholes. Drive carefully to avoid them. 
• Stay updated on weather and road conditions before driving in adverse weather. 

How to Handle Being Stuck in a Flood

Being caught in a flood while driving demands quick and informed decisions to ensure safety and minimise vehicle damage. Here’s what to do if you find yourself in this situation. 

• Stay Inside: It's usually safer to remain in your car and seek help if trapped in floodwater. 
• Call for Assistance: Dial 999 in emergencies or contact roadside assistance if you're a member. 
• Do Not Walk or Swim: Avoid moving through floodwater on foot or by swimming, as it can be extremely dangerous. 
• Exiting Safely: Only leave your car if the water is shallow, still, and you can see the ground. Use an item to feel for hazards if walking in water. 
• Monitor Water Levels: Be aware that water levels can rise quickly. Make decisions based on current conditions. 
• Having an emergency plan, including knowing emergency numbers and ensuring your phone is charged, is vital. Always prioritise safety over your vehicle or belongings. 

Responding to Water Damage to Your Car 

In areas with high rainfall and flood risks, knowing how to address water damage to your vehicle is essential. 

• Inform Your Insurer: Report the damage to your insurer as soon as possible. 
• Assessing Damage: A submerged car is likely a total loss. If in shallow water, air out the car and remove wet components. 
• Checking for Contamination: It's important to check for water in the oil and air filter: 
• Oil Contamination: Water in the oil can harm the engine’s lubrication, leading to damage. 
• Air Filter Inspection: A damp air filter can restrict airflow and allow water into the engine. 

Detecting these issues early can help prevent more severe damage. 

Avoid Engine Start 

Starting a flooded engine can lead to hydrolocking, causing severe engine damage. Hydrolocking happens when water fills the engine cylinders, preventing normal compression and potentially damaging engine components. 

Drying and Clearing 

Ensure your car is dried and drainage holes are clear to avoid further issues. 

A professional evaluation is crucial to determine the extent of the damage and the repairs needed.