We have three big drain holes. The lanai itself wasn't a problem as it is under roof, but when we added a birdcage five feet out it collects lots of rain water in a pouring rain. We drilled three 2" holes through the concrete at an angle in a span of 46' to release the water. They work very well.
Like my husband says "Don't worry, it's not going to flood. If the water should rise above the aluminum rail secured to the floor, it will escape through the screen."
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