I live in Ontario, Canada and close my pool for the winter, drained below returns etc. and covered with lock in pool cover. Ihave started to drain the huge amount of water from the top oif the cover, however it seems that the level of the pool water seems to be dropping also. Anyway I can determine if the pool cover has a hole in and maybe I'm draining pool water at the same time?? Or could be just imagining the pool level dropping?? Any thoughts would be helpful. First srping with the new pool.