The presence water can let your vehicle lose contact with the road surface. A tyre running through water creates a wave ahead of it. The tyre tread hitting the water at the front of the contact patch suffers an increase of the water pressure. When the water pressure becomes greater than the average pressure of the tyre on the road surface the tyre vehicle may lose control.
Therefore the water covering the tyre must be removed quickly through tyre design to avoid aquaplaning.