1. Reduce your speed
If your vehicle begins to hydroplane, you should reduce your speed.
From the web:
Hydroplaning occurs when pressure from the water in front of your tires presses the water under the tires, making your tires “float” in the water between your tires and the pavement.
While you may be tempted to hit your brakes when you lose control of your car, this is not something you should do. Instead, stay calm, and lower your foot to the gas base. This will cause the car to slow down on its own.