I built a fixed dock over my outlet and closed off the sides with pig panels. Been using for 20 years. Only issues were beaver tunneling under the wire to clog the drain. Built a complete pig-panel box on the upside of a culvert in another location where beaver are active, and so far is working.
More good info!
I have observed beavers dragging cut trees of impressive size across lakes. What were your beavers using to clog your outlet once they got inside your panels? Did they manage to get some large sticks under your panels and incorporated into their project?
I have seen them use clay and grass to make wet "adobe" at my property that can withstand running water. The beavers then start working sticks into their project. I don't know if Jbbb has them at his pond, but I imagine they could completely clog a hooded pond outlet in less than an hour!
