Bill, these are just 12' diameter x 30" deep Intex pools. I think about 1700 gallons or so. There is a sump pit in the basement with a submersible pump I exorcise on a regular basis just to make sure it's working. A few years ago, pump didn't work, and with the rains and water table that year, ended up with about 9" in the basement. Yeah, it was a mess with a finished room down there, but that's been removed for the most part.