My son's friend had just moved to Camelot Village the end of June. Somehow putting nothing but roofs in the Blue Zone (flood plain/swamp) was according to the planning department the best way to get density near the major traffic corridor. Oops.
This has happened to Camelot Village about every three years since I got to town in 1981. Supposedly it used to be worse but JP Goforth did a concrete ditch or something when he did the Oaks S/D.
ETA the lowest spot in Chapel Hill is the duck pond behind the Rainbow Soccer fields. There's a lift pump there to pump the poop to Finley.