At what water level is a car considered flooded?

[VanGrace]

The criteria for defining a flooded vehicle are as follows: If the water level exceeds half of the wheel height and enters the interior, it is called a water-soaked vehicle; if the water reaches the engine hood, it is called a flooded vehicle; if the water exceeds the roof, it is called a submerged vehicle. The specific water levels and impacts when a car is submerged are: 1. Water just reaching the chassis—the floor may get damp, but significant water ingress is unlikely, and the impact on electrical components is minimal. 2. Water exceeding half of the wheel height—due to the vehicle's incomplete sealing, water begins entering the cabin. For low-sedan models, the water level may affect seat adjustment motors, heating, ventilation, and other electrical components. 3. Water almost completely covering the tires—the cabin water level will submerge the seat cushions and center console, affecting numerous electrical systems. 4. Water reaching the engine hood—the cabin water rises to the dashboard level, and the headlights and engine air intake begin taking in water. 5. Water fully covering the engine hood—nearly all interior electrical components will be compromised. 6. Water exceeding the roof—the headliner and sunroof module sustain damage, with no interior component remaining unaffected.

[AliceRose]

I consider a car to be water-damaged once the water level reaches below the vehicle's sill. Generally, vehicle flooding can be categorized into several levels: if water only reaches the middle of the wheel hubs, it might just be slightly damp with minimal impact. However, once water surpasses the sill or the bottom of the doors, it can easily seep into the interior, damaging carpets and electrical circuits—this marks the starting point of water damage. Water ingress leads to mold growth, electrical shorts, and even unpleasant odors inside the car, making it unsafe for long-term use. If water reaches under the seats, it's even worse—the battery and engine control module could be ruined, resulting in extremely high repair costs. If the water reaches the dashboard, the car is usually beyond saving. Water-damaged cars pose significant risks, such as stalling in rainy conditions, so when buying a used car, carefully inspect for moisture stains and rust in the interior. Having repaired many cars, I know water corrosion is a slow process, so I recommend avoiding deep water areas and performing regular anti-moisture maintenance.

[Ann]

The definition of a flood-damaged car is quite important, especially for family vehicles. The water level is a key indicator: if the water only reaches halfway up the wheels, it's not a big deal, but if it surpasses the door sill or the lower part of the door, it means water has entered the interior, classifying it as a flood-damaged car. Water can soak the carpets, leading to mold and bacterial growth, which affects health; circuit boards may short-circuit, causing issues like parking light failure. If the water reaches under the seats, electrical components such as the air conditioning system can be damaged; flooding above the engine hood is even more dangerous. Flood-damaged cars depreciate quickly and incur high repair costs. I believe driving safety comes first—flood-damaged cars are prone to malfunctions during the wet season, so it's best to park on higher ground and check if the carpets are dry when buying a car. Remember, the door sill is the boundary—if water has crossed it, be cautious.

[EmiliaRose]

The water level height of a flooded car mainly depends on the extent of the electrical system being affected. Submerging below the door sill is considered flooding because water entering the interior can wet the circuits, potentially causing short circuits in control units, leading to headlight failure or navigation malfunctions. Submerging the seats is worse, as the battery is prone to damage. Submerging the dashboard basically renders the car a total loss. During repairs, there are numerous hidden dangers, such as corrosion and mold growth. Water level surpassing the door sill qualifies as flooding.