S.C. Code Ann. § 49-17-1330

In case the total assessment exceeds the average of twenty-five cents per acre on all the lands in the district the board of drainage commissioners may give notice of three weeks by publication in some newspaper of general circulation in the district, if there be one, and also by posting a written or printed notice at the door of the courthouse and at five conspicuous places in the drainage district that they propose to issue bonds for the construction of such improvement, giving the amount of bonds to be issued, the rate of interest they are to bear and the time when payable.