My normal water level in our in ground pool seems low. Basically and inch or so above the skimmer inlet…. i’ve been having to fill the pool because of evaporation. And if I get a lot of rain or, like the other day, I overfilled ( not overflowing) the pool a little bit. By the next morning, the level dropped 3 inches… right back down to the normal water line.. shouldn’t the normal water level be higher up on the side of the tile.? It just seems that the level sits lower than it should be and I was wondering if or how I can find the overflow and if it’s adjustable.