We fill our pool up to about 2 - 3" below top skimmer level. Every time there's a heavier rain ( 2 - 3") my pool overflows by the skimmer. We always have to bucket the water out from behind the pool and I'm affraid it will sink in if it will keep happening especially in early fall when we get more rain. Is this normal? How to prevent this? We are going on vacation soon and I'm affraid what we'll find when we come home. Please help!