I have pens with tarps over the top and the rain is not leaking through it but the ground is still wet and they are too. I think that the rain is coming in sideways. I am planning on putting a tin roof on the top soon but if the rain is coming in the sides and the ground doesn't have the chance to soak it up cause it is raining so much then this isn't going to fix the whole problem. I know with a roof across all the pens instead of broken up by tarps will be a big difference. But what I am asking is does anyone out there put tarps up on ALL three sides or some kind of wall structure? Ideas, opinions, and pictures are welcome.