I am here in Sacramento area getting pounded with rain. First since we bought house back in May. I assumed there was an overflow line (looks like a return that has a white piece of pvc connected protruding out of the grass about 2ftfrom the edge of the pool). What if that is not what I thought it was? The water level is just at the opening of the suspected overflow tube. If the water doesn't drain, is it OK to let pool overflow?