I'm interested in looking at various material's hydrostatic head vs. weight so I can make an informed choice regarding the best choice for a bivy sack bathtub floor.
Is anybody aware of any documentation outlining the weight and hydrostatic head of various materials used in the outdoor industry?
What I've found is the hydrostatic head (basically fwiu the waterproofness of fabric under pressure) of silnylon is ~ 700mm to 1400mm which is only 15% that of traditional tent floor materials.***
I'm particularly interested in the hydrostatic head of the various weights of cuben fiber and if cuben fiber might be a better choice for a bivy bathtub floor than silnylon. I know cuben is not as puncture resistant as silnylon but I would still be using a polycryo groundsheet which should help in that regard.
What I really want is a bivy with a bathtub floor that is suitable for camping in harsh wet environments like New Hampshire's White Mountains… i.e. – where site selection for camping is severely limited by terrain or regulations or both and you may find yourself camping on saturated ground or ground that will run with rivulets of water in a prolonged rainstorm.
*** Jim Wood, "A Treatment for Silnylon Floors," May 11, 2005, http://jwbasecamp.com/Articles/Silnylon1/index.html
