Concrete vs. Liner
I'm going to build a small pond, a rectangle in a flagstone walk. It appears that most people are going with liners. I assumed it's for ease but I have an Ortho book that dismisses concrete altogether.
Since I'm having the walk poured (as an adjunct really since I'm replacing the top of a 1/4 mile long driveway and having a retaining wall and pad for my horse trailer added at the back of the barn) concrete seems an easy, permanent way to go.
Is there any reason not to go this route?