During recent observed runs with our Associates, there have been plenty of opportunities to deal with the recent heavy rains and flooding. With the promise of more to come, it is worth our while thinking about the dangers of driving through flood water. Floodwater is capable of causing significant damage to your car and posing serious threats to your safety. It is one of the most popular ways of writing a car off. Floodwater is often deceptively deep, and the road surface beneath may have pot holes and lifted drain covers, creating a very hazardous situation for drivers.
Dangers of Driving Through Flood Water
Hydro-locking: When water enters a combustion engine's cylinders, it can cause the engine to seize. The water enters through the car’s air intake, which is usually between 15 and 30 cm from the ground in the engine bay. Water cannot be compressed like air, and the piston strikes the water with immense force, leading to severe engine damage. It only takes an egg cupful of water.
Electrical System Damage: Water can short-circuit electrical components, potentially leading to a loss of power steering, brakes, or other essential systems. It can cause an electric car to fail completely.
Brake Failure: Floodwater can contaminate brake fluid, rendering the brakes ineffective and potentially damaging ABS and stability systems .
Loss of Control: Floodwater can reduce tyre traction, making it difficult to steer and brake. This can be exacerbated by debris and unseen obstacles hidden beneath the water.
Structural Damage: The force of floodwater can damage the vehicle's undercarriage, suspension, and exhaust system.
Health Risks: Floodwater may be contaminated with sewage, chemicals, or other hazardous materials.
How to Deal with Flooded Roads
Turn Around, don't risk it: The safest course of action is to avoid flooded roads altogether. If you encounter a flooded road, find an alternate route.
Check the Depth: If you must cross a flooded road, assess the depth of the water. If it's more than 10cm or 4 inches deep, try to find an alternative route.
Test the Depth: If you're unsure of the depth, walk through the water and perhaps test it with a stick.
Drive Slowly and Steadily: If you must drive through floodwater, do so slowly (walking pace) and steadily. Avoid splashing other vehicles or pedestrians.
Check Your Brakes: After driving through flood water, gently test your brakes to ensure they are functioning properly. If they feel wet or spongy, have them checked by a mechanic.
Have Your Vehicle Inspected: If your vehicle has been submerged in floodwater, have it inspected by a qualified mechanic to ensure it's safe to drive.
Additional Tips:
Stay Informed: Monitor weather forecasts and be aware of flood warnings in the area.
Plan Your Route: If you're traveling in an area prone to flooding, plan your route in advance and consider alternative routes.
Carry Emergency Supplies: Keep a flashlight, first-aid kit, and other emergency supplies in your vehicle in case you become stranded.
Remember, driving through floodwater is a risky endeavor. By understanding the dangers and taking precautions, you can help ensure your safety and protect your vehicle.
David Eastwood, Chief Observer
