GEORGETOWN, S.C. — Eleven days ago, Lee Gantt was at a Hurricane Florence party in her neighborhood in Georgetown, where the story goes that some houses haven’t flooded from the Sampit River since they were built before the American Revolution. She will spend Tuesday with sandbags, watching the nearby river rise from Florence’s heavy rains and seeing if the luck finally runs out on her home built on Front Street in 1737. “We thought this might be coming.