>>2353748missed your reply sorry; nope, have not had problems with rain, worst was when I tried a different tarp arrangement and rain pooled on my "roof", woke up to a weird cold pressure on top of me, it was the cold water pooled in my tarp sagging down and touching me.
Have recently had strong wind directly into the open side blow the pegs out the ground, have invested in a bigger tarp that I can make a tent out of, or put up as a lean-to.
I always use a bivvy, sometimes the foot of the bivvy gets wet but nothing gets through. Have slept in a puddle with a bivvy, rained in the night and water pooled under me, I was dry as a bone.
p.s. prussic knots.