For example, could you cut off a one foot section of wavy polycarb, and attach that underneath the cattle panel below where you puncture the roofing panel? Use that one foot section kind of as like a gutter, so any water that comes through is drained away (or drained into a waterer for the...
I'm not sure how to apply this to wavy polycarbonate with the cattle panel, but for my flat panel roofs, I have a piece of wood that the polycarb is drilled into, and the wood runs the length of the panel in the angled direction. 95% of the water that goes through the holes runs down the wood...
I've not worked with wavy panels before, lots of experience with flat, but my first thought is to use wire to weave through the cattle panel, then go over the top of the poly panel in a valley, and tie tightly, making a loop. Another option is drill two holes in the poly on each side of a cattle...