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Here’s my son and grandson catching some bream for supper last year. My pond is 2+ acres and requires no maintenance...... well sometimes the spillway needs cleaned or repaired. I live in the Deep South and freezing isn’t an issue for us.
But I’ve built dozens of ponds from small water features to as large as 100 acres. For the large ponds we hire Southeast Pond Management to provide the stocks and manage the water quality. But for water features we use liner material, pumps, and rocks. Pinterest or some other sites like that should be able to provide inspiration ( if needed ) . But if I am offering advice to someone on design it would be.......
1. Elevate it enough to prevent contamination from run off of rain.
2. Protect the pump in such a way as to prevent the fish from being harmed.
3. Make pump easy accessible for routine maintenance.
4. Make sure to have adequate aeration and filtration.
5. Always have a backup pump .
6. Make a hideaway in the deep section of the pool .
7. Provide vegetation.
We always use black liner..... it’s easy to hide in a landscape feature and grows less algae than a gray shower liner or white roof membrane.
I’m not an expert but building it is one thing and maintaining a proper environment for fish is next level.