I had a pond years ago, just 4 X 10 feet and only 2 feet deep, with a rubber liner. One labrador later and the pond unfortunately didn't survive, and I really miss growing lilies and having a few gold fish to watch. Anyways, I was driving through town and saw 2 pre formed ponds on someone's lawn with a "make an offer" sign on them. They are pretty good sized for preformed and was able to snap both up for $100. Here is the question I have, I would like to set the smaller pond above ground about 3/4 of a foot and let it spill into the larger pond for a water fall effect, so my question is, can a preformed liner be heated and reshaped to act as a spillway and if so how? Thank you!