Maybe somebody will have an idea for you. Unfortunately, I don't. But, I did have a similar problem.
When we filled our very first pool years ago, I had the garden hose taped to the edge of the top rail filling the pool. Overnight, the tape came loose and the hose popped out and was aiming at the base of the pool. Who knows for how long! We had an area on the floor of the pool near the wall where the sand washed out. It was about as big as an adult's footprint and about 3 or 4 inches deep. We just lived with it and never had any problems. I just told the kids to not mess with "the footprint" and we never had any issues.
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