Well that was a thought I had once I saw it was draining off the top and in the back, back into the woods. It's up on a "platform" on a sheet of wood I found out there practically buried in the mud. I dragged that out, raked up as much mud and whatever else debris I could to raise it up on the right hand side to make it as level as possible. after seeing how high it was on the right, I thought of making a "stairwell" from the top of the pool back down to the muddy ground. My only problem with that is, this ground is constantly wet and muddy so it's bound to sink over time. But I love the thought of creating my own waterfall. With all the plants growing over in that area, it would look so pretty. My husband is off tomorrow so I'll have to venture out to lowes and see what I can find that would work well as far as pavers go. I think I could make something without having to spend a lot of $$$.If I am recalling your previous pics correctly you are using a kiddie pool. I have years of experience with those things. They break under pressure, so I would suggest a hole several inches under the top level to allow water to get out before the pressure builds up and causes a crack in the pool.
If I were able to make such a wonderful pool area for my birds I would be out there with the drill, large width drill bit and some wood or rocks....then I would drill a line of holes about 3 inches below the top lip of the pool so the water can flow out. Once I saw where it was hitting the ground I would put the wood or rocks (or both) right where the water was hitting the ground to slow/stop erosion. My own water fall. I would be in heaven, the ducks would have somewhere to swim, the chickens would be eating the worms and other yummies the wet ground brought to the surface. I take a chair out there and sit around watching the flock's antics.
Ok, now I am officially jealous.