How many inch of water that can cause hydroplaning?

Hydroplaning can begin with as little as 1/12 inch (approximately 0.08 inches) of standing water on the road. However, the risk increases significantly with greater amounts of water, particularly when traveling at higher speeds. Generally, at speeds above 35 mph, even 1/10 inch of water can lead to loss of traction. It's important for drivers to be cautious in wet conditions to avoid hydroplaning.