At what water level does a submerged vehicle become dangerous?
2 Answers
When a vehicle is submerged above the tire level, it becomes dangerous. Reasons for the danger: The biggest concern when a vehicle is submerged in water is the impact on the engine and electrical systems. If water enters the engine intake, it can directly affect the engine. Safe water level: Generally, water levels below the intake are considered safe. However, the height of the engine intake varies across different vehicle models, as does the level of electrification and the lowest electrical component positions. High failure rate of water-damaged vehicles: Automobiles contain a large number of electronic components. If submerged, the reliability of the vehicle in the future can be compromised. Even after replacements, it is difficult to guarantee the vehicle's reliability, and the likelihood of failures increases over time. Water-damaged vehicles develop odors: When the interior is submerged, odor is an inevitable issue. Since the usual treatment methods include rinsing, drying, and sun exposure, some hidden areas can easily become breeding grounds for bacteria, leading to unpleasant odors.
Last year, I encountered heavy rain while driving, and my car was submerged to half the height of the wheels, resulting in circuit damage that cost over ten thousand yuan to repair. When the water level reaches about half the wheel height (around 20 cm), it becomes dangerous as it may trigger ABS and brake failure. If it rises further to the bottom of the doors (around 40 cm), water can enter the exhaust pipe, causing the engine to stall, and the car may even float and lose control. Beyond 60 cm, the entire car can float or be submerged, making it impossible to open the doors. During heavy rain, I avoid driving if possible. If trapped in water, immediately unbuckle the seatbelt and escape through the doors—safety comes first. Even seemingly shallow flood levels pose hidden risks, as underwater pits or debris can be hazardous, and high-speed water wading is harder to control. Post-flood handling is troublesome, with rapid depreciation and reduced resale value. It's best to regularly check window seals and drainage holes as a preventive measure.
