Backyard Pond Year before last we have very cold weather for an extended period and the large rock that is the basis of the waterfall for our pond cracked from the freeze. It caused water to flow out the cracks on the side and leak out of the pond. We had to use pvc pipe to route around the rock & waterfall. Last weekend we finally fixed it! Our neighbor's pond pump quit and she gave us her waterlillies. Now the pond is once again the lovely oasis in our backyard. Here are the results.