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What type of foundation for pond/stream?

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You have 2 choices for building a foundation for your pond and stream. 1. Build a foundation / structure that will NOT flex under any condition. This would be a traditional steel reinforced concrete foundation. Very expensive, very messy to install. 2. Build a flexible foundation that can move with the surrounding soils. This would be an engineered fill compacted in place. This is what the RR's do for the tracks, and how streets are built. I'd go with #2. Excavate at least 8", or preferably below frost line and bring in roadbase or crushed rock. You'll need to compact it with a "jumping jack". To protect the pond and stream liners you'll need to cover the sharp stuff with sand. Make sure you design a little "slop" in the height of the pond sides to make sure the liner runs well above the outlet to your stream in case something moves. I'd then line the inside of the stream with suitable rock to make a babbling stream, hiding AND protecting the liner. Ditto with the pond liner, or you could use a thin layer of sand with plants & such. Don't forget running the electrical and plumbing before you make everything look pretty. A guy I used to work with did this a few years ago. Used shotcrete and spent a small fortune, before he ended up moving 2 years later. Mark in Utah
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