Pond Boss Forums POND CONSTRUCTION Selecting a site Concrete pond construction

Look at how they make in-ground swimming pools.

If it was mine, I'd not worry about using the bedrock to be the bottom of the pond, I'd shotcrete the whole thing. I would first plan on somehow putting a drain in the bottom so you can drain it out. to clean it. With no dirt on the sides, and no dirt on the bottom, what you are describing is more like an aquarium. With those steep sides, the fish may not have any place to spawn. Without dirt in the bottom, you will have a hard time getting enough plants and bacteria in the pond to deal with fish waste.

So some type of filtration system may be needed.

If you only shotcrete the soil on the sides, how will you ensure that it is sealed to the bedrock so water doesn't leak out between the shotcrete and the bedrock? There will need to be a sire mesh/rebar structure built on the sides to give support to the shotcrete so it stays in place while it is still wet. Again. similar to how they build in-ground swimming pools.

What happens if the bedrock DOES leak? What's plan B to address that problem?