We had a couple gully-washers here this week. It has been cool so we haven't been swimming in a few days. I noticed today what I thought was a wrinkle, but it is actually either the sand or the clay under the pool got washed out. I am seeing the outline of 2 of the metal uprights. I went underwater with goggles and the liner looks ok, it does not appear to be damaged. How urgent is fixing this? I realize I have no guarantee it won't get worse. Is it possible to do without draining the pool and pulling the liner? I don't see how. I'd rather not pull another 10k gallons out of my well so soon, plus the start-up chemicals are expensive. Assuming I wait till fall to drain the pool, will it hurt the liner to sit for the winter with no water in it? What is the risk to the liner if I empty the pool?