Easy Clean Duck Pond
If you have ducks check out this easy clean duck pond idea. He took a kiddie pool and made a hole for drainage that he seals with a cork. Then he built some timber pieces to hold it up and then when it needs cleaned he just pulls the plug and it drains into a makeshift septic underneath.
I believe you could capture the water to use as fertilizer on the garden. Then he rinses it, plugs and refills and the ducks are back to swimming. I really like the look and it would be easy to clean. I think the ducks like it. Crutch shared this on Survivalist Boards, you need to scroll down about halfway on the page to see the picture.