
I wish!! Another thought, if you were making a trap that will be used in a stream, what about making the opposite end from the opening a pointed non-mesh cone. That would make a bit of slack water directly behind it, and maybe help keep debris from building up on the upstream side of the trap. If you were to make it flat on the bottom, and angled to the top like this
/, with the water flowing in > direction, then the flow of the water would help keep it stuck to the bottom.
It's just a thought, I've never tried it.