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Sure,
The pitch above is high off the ground - this is for summer, warm conditions, when you want fresh air flowing under the tent to keep you refreshed.
When it's raining, you pitch the tent very close to the ground, or on it. That stops any water from getting in the sides. Then you lay the Tyvek down inside and sleep on that, it stops any water coming in from underneath.
Some people like to use an insert with a "bathtub floor" but I have never found this necessary if you choose a campsite properly! Go somewhere with good drainage if it's going to piss down...
platypus
Sorry to be a pain, but curious to know how that works - if it's just a flat sheet, how does that stop water getting in if it gets wet? Needs to somehow have a concave profile, upturned edges, surely?