Broadback wrote:
I am constructing a wild life pond, so purchased liner plus 2 underlays.
Having carefully laid all three, placed some stones and soil on the
bottom I proceeded to fill. Unfortunately the "overlay seems to want to
float, and bellows up from the sides, though I keep pushing it down with
a pole it has a tendency to come back up again. Any solutions please?
admittedly every time I push it down it seems to come up less, do I just
need to keep persevering?

I've never heard of complelely covering the liner with another layer of
underlayment, only using pieces under large rocks. Isn't that going to
be a real bear to clean?