Jans comments are correct. I only drain mine to mid-skimmer level so with snow and ice, like today, the level will go up. Trying to drain at this time would be more of a risk because the massive ice block can do damage.
Al
Edit: I found the duplicate post and Carls response. To restate...be careful if you drain with a large ice block in the pool. That's a lot of weight and if thick enough it can damage stairs or even shear off the return jets if they protrude into the pool even a little...as they usually do. I force a rectangular piece of foam in the skimmer throat so ice can't creep into the throat. I have drained mine with a thick ice block but do it very slowly, maybe 1/4" every day and I do keep a close eye on problem areas.
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