Last year we made a small waterfall/pond in the garden. It was nice but not exactly what I wanted. We are thinking about expanding the water area, maybe making the pond area bigger and having water fall in from a higher level. I wanted to know if anyone has made a small pond area using concrete for a base. We thought we would layer the concrete then imbed it with stones, we have a lot of small river rocks, and ocean stones, and thought it would look nice and more natural. Does anyone have any thoughts or advice on this? We live in NY state and I wonder if the concrete would crack or of it would hold up. Thanks for any assistance!