We have having our vinyl pool liner replaced and also partial replacement of the slab since some areas have been settling over the years and mudjacking didn't help. My neighbor, who also owns a pool, recommended that we ask to have an overflow drain installed while we're having this work done. I asked my pool contractor, who's been in the pool business for 25-30 years about this and he said he wouldn't recommended it. He said it's an extra expense and when the kids swim and jump in the pool and create waves we will be losing water through that overflow drain. However, I have since found some overflow drains online that have a closing mechanism. Our main concern, of course, is pool overflowing during heavy rain. Our contractor said that pool overflowing is not a big deal and we shouldn't worry about this because it won't cause any damage. All I know is that in the last 5 years of owning this house/pool we tended to worry about heavy rain and pool overflowing (mostly at night, when we can't monitor it and it rains heavily or when we're on vacation). So, should we stop worrying about the pool overflowing or would it be wise to install the pool overflow while we're having this construction done?