Hello NorEastFla,
We don't get nearly the amount of rain that you do, I live in the AZ. desert. That system was up and running last winter/spring when we get most of our rain for the year. The rest we get in late summer during the monsoons. But I never had any issues of that system flooding or overflowing. I changed reservoirs (to a larger one) in spring when the plants started to grow rapidly because of the warmer weather. The first reservoir held up to 10 gallons, the later one held up to 18 gallons. I never measured how much water got in the system, some did. But between the little amount that did, and how much the plants drink daily, I didn't have a problem with that even if it rained for 3 days.
But in your case you will get much more rain than me. In witch case if it becomes a problem I have a simple answer for that. I would just use plastic lids, like from empty margarine, butter, sour cream etc. containers ,as long as it is larger than the baskets. Cut holes in the center of them large enough for the stem of the plant to grow and and not grow into the lid. Then cut a slit down one side so it's easy to slip on and off when needed. And in cases of high winds, a zip-lock bag with some sand in it tucked around the stem on top of the plastic lids should keep it snugly in place. Not that it would fly off, but the edge of the plastic lid can cut into the stem if it moves around a lot. As for the reservoir, I would just place it underneath a table or something to keep water off the lid and draining through the cut-outs.
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