this w/e i set up my tarp under the rl (w/ prusiks/bic pen toggles) and it was great for a few days in perfect weather, but sunday afternoon there was a sudden heavy rain and quite a lot of water accumulated in a top fold in a matter of minutes. i think the snow would do the same, just not as quickly. maybe the prusiks were not taut enough.. so i tightened them and swapped the tarp over the line which kept the water rolling off (and i don't want to have to do that during the night for example). otoh when the storm was over and i wanted to enjoy the view i set it all up as it was and folded the front part of the tarp over the rl bakers hut style.