S.C. Code Ann. § 13-12-120

If an election is ordered as provided in Section 13-12-100, the election shall be conducted in the same manner and under the procedure applicable to the issuance of general obligation bonds of the counties of the State by the provisions of Chapter 15, Title 4, as now or hereafter amended. Approval of the question put to the electorate shall require an affirmative vote by a majority of all qualified electors voting on the question throughout the jurisdictional boundaries of the authority.