This is kind of interesting. Charleston, South Carolina has banned slab on grade for new construction. Because basements are not an option in that area, that leaves raised crawlspace construction, with the floor level typically raised 2 feet to 4 feet around the surrounding grade.
While slab on grade is generally favored by builders in warmer, coastal regions, it does tend to exacerbate flooding risks in a low level flood plain. A raised crawlspace keeps the home above the maximum flood level, particularly if builders keep the bottom of the structure at least 2 feet above grade and preferably higher.
Away from the coastal plain, crawlspace is the dominant foundation in both North and South Carolina.
Rather bold move by the city council, but given their unique concerns, it appears to be a justified move.