Looks like my pond liner has developed a leak. I want to put a new liner in over the old one but I have a few issues that I want to take care of since I am going to have to drain the pond and move rocks etc. I need something that I can put behind the old liner to stop the dirt from falling forward. I have a couple of spots that the dirt clearly had a cave in behind the liner so now it bulges out in those area's. It would need to be something that is rot resistant, can conform to curves but still have the needed strength to hold back the dirt. It can't be anything that would puncture the liner either. Thoughts????? The other thing I need to do is build up some areas because when I fill the pond as far as I can there is still a lot of the liner showing in a bunch of areas. Not sure how to do this without it all caving in. Would really appreciate some help with solving these problems and replacing the liner when the time comes.