Water pressure is directly related to the depth of the water. A film of water has no pressure at all and only capillary action will allow seepage thru the seal which in my nearly 20 years of slide out experience is water proof. I'm certain my 3100psi pressure washer could push water thru the seals though, but rain and snow has never intruded.
A canopy over the slide will assist in keeping water out during rain and prevents all the leaves, pine straw, and bird poop from coming in when the slide retracts.
-- Chuck
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2006 Roo 23SS behind a 2017 Ford Expedition
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