We've had a lot of rain lately - a few inches - and it's raining now. I usually keep the water level about an inch below the top of the skimmer (I think I read that somewhere), but when my pump kicks on in about two hours, the water level will be over the top of the skimmer because of the rain. Is it okay to run the pump like this for the night? I don't want to go out there in the pouring rain to drain water through the backflush valve.