They normally say not to drain your pools before a hurricane. Here's why:
When you get that hard amount of rain coming in, soaking into the ground, sure, it'll fill up slowly, but the aquifer several feet below you will put pressure against your pool, changing the shape of it, and possibly making it spring a leak into the ground worsening the situation (having your pool in a "pool" of mud), costing you more in maintenance and water costs.
Whatever you do, don't get into your pool even a week after the hurricane passes even if you have power. That water is so cold, your balls will jump into your throat before you're knee-deep in the water.
