Little known fact...the biggest factor in hydroplaning resistance is tire pressure. It has nothing to do with tread design or tread depth, despite what tire manufacturers try to sell you. The higher the pressure, the higher the speed you can achieve before your tires will lose contact through puddles.
Another thing that surprises many...the weight of your vehicle is practically irrelevant. Water doesn't care if you're a Spark or Silverado. Silverados run higher tire pressures, so they resist hydroplaning better than most cars. But remember, a 747 can hydroplane easily if its tire pressures are low (they run almost 200 PSI to avoid hydroplaning at 180 MPH).
The tire pressure formula used by pilots to avoid hydroplaning ignores weight, since it is such a minute consideration.
Now, traction on a wet surface (not accumulated water) depends on many factors, including tread design, tread depth, alignment specs, rubber composition and road surface condition. This is unrelated to hydroplaning.
So, if you're worried about hydroplaning, jack your tire pressure to max allowed by tire specs. Just remember, this procedure won't improve your cornering or braking ability if the road surface is simply wet - won't hurt, though. Then, remember to lower your pressures to the car manufacturer recommended spec when the rain ends to avoid uneven tire wear and a hard ride.
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