S.C. Code Ann. § 49-19-2630

If it should be found at any time that the amount of total tax levied under the provisions of SECTION 49-19-1610 is insufficient to pay the cost of the works set out in the Plan of Reclamation or additional work done under the provisions of SECTION 49-19-2620, the board of supervisors may make an additional levy to provide funds to complete the work. But the total of all levies of such tax shall not exceed the total amount of benefits assessed.