I saw an Australian invention for collecting garbage, it was a simple net over the end of a culvert; great idea. As I inspected the image in the post, I realized that fish could be harmed, although it was a simple idea, I wondered if I could do something better in my mind. Attached is a diagram, hopefully you can figure out my suggestions for a similar solution.
This is just an idea, lets see if we can flesh it out, add things, come up with your own thing, let's get a solution out into the world; ASAP.
I hope for all beings, all good things.
In Light and Love
Giant Hugs<3<3<3