FishingPal,
Are you sure you need a liner? It's an added unneeded expense of a few grand if you don't.
Just asking and could be way off on this, but I've run into people in may area that assume you have to have a liner to have a pond which is not the usually the case in my area.
Not absolutely sure I will need a liner but just planning in case I do. I have another pond and it is a leaker. Damn is not the problem but water table. This new pond would be very close to the home and don't want a mud pit that close with dying fish.