content: The foundation didn't do a thing.  It's just poured on sand, and the sand washed out from under most of it.  The thing holding it up is the piers sunk way down into the ground.  They're probably 15-20 feet below the estimated scour depth, so as much as 30 feet below the "ground level" around the house. https://www.fema.gov/media-library-data/20130726-1707-25045-4311/chapter6.pdf https://www.fema.gov/media-library-data/20130726-1510-20490-9375/fema55_volii_ch10rev.pdf