Hydroplaning (Aquaplaning) - Smart Motorist
Hydroplaning (called aquaplaning in Europe and Asia) occurs when water on the roadway accumulates in front of your vehicle's tires faster that the weight of your vehicle can push it out of the way. The water pressure can cause your car to rise up and slide on top of a thin layer of water between your tires and the road. While hydroplaning your vehicle rides on top of the water, like a water skier on a lake. In less than a second, your car can completely lose contact with the road, putting you in immediate danger of sliding out of your lane. This usually happens at higher speeds, over 40 miles per hour. Try to imagine your vehicle traveling at a high rate of speed on a sheet of ice: that image approximates what will happen if you try to brake or steer while hydroplaning.
The 3 main factors that contribute to hydroplaning:
Vehicle speed. As speed increases, wet traction is considerably reduced. Since hydroplaning can result in a complete loss of traction and vehicle control, you should always reduce speed, paying attention to the traffic around you.
Tire tread depth. As your tires become worn, their ability to resist hydroplaning is reduced.
Water depth. The deeper the water, the sooner you will lose traction, although even thin water layers can cause a loss of traction, including at low speeds.