Only §§ 16-15-5007 and 16-15-5008 apply to any county having a population in excess of four hundred fifty thousand (450,000) and any county having a population of not less than two hundred eighty-seven thousand seven hundred (287,700) nor more than two hundred eighty-seven thousand eight hundred (287,800), according to the 1980 federal census or any subsequent federal census.
T.C.A. § 16-15-5011