In Reply to: Phase 1 of posted by Accomplice on March 03, 2003 at 13:45:07:
Gravel under the liner would be a bad idea. That would cause more chance of your liner being ripped, espeacialy if you had to do any maintance work by walking around in the pond. Any garden pond manual/book will advise to add sand underneath the liner. You would be better off adding a smooth textured gravel on top of the liner inside the pond several inches deep to prevent as easable access to the liner from the tortoises. Less chance of problems would be to form a concrete pond and add smooth textured gravel on the bottom.