I'm building an 8'x20' storage shed for the backyard. I've done some woodworking, but I'm more comfortable with metalwork. Instead of triangular roof trusses out of wood, I'm thinking about making smoothly curved arches with a tube roller. The idea would be to lay corrugated metal roof panels lengthwise so that the "wavy" orientation bends around the curve and the stiff/"straight" orientation spans the length of the building. Like a half cylinder, or a quonset hut.
Edit: But it would not be entirely a quonset hut. The shed will have traditional straight framed walls; my question/idea only concerns the roof i.e. top portion of the structure.
My question is whether it will be a problem that the corrugations on the apex of the arch will effectively form 20' long horizontal "channels" with no slope for rainwater?
(By the way, we rarely get snow where I live, and not much accumulation. We do get ice storms every other year. We have high winds, gusts 50+ mph, throughout every season, enough to scour anything laying on the roof off of it.)