S.C. Code Regs. § § 61-119.K
The expiration date of an interbasin transfer permit or interbasin registration, including any water withdrawal right or authority contained in the permit or registration, in existence on January 1, 2011, remains effective. For the purposes of this chapter, existing interbasin transfer permit or interbasin registration holders are deemed to be existing surface water withdrawers. A renewal of an interbasin transfer permit or registration must be made pursuant to the criteria established in Section 49-4-10 et seq. for existing surface water withdrawers, except that permits or registrations renewed within three (3) years after the effective date of this chapter must be renewed for a quantity at least equal to the permitted quantity in the expired permit. All other renewals must be issued in accordance with the criterion applicable to existing surface water withdrawers and for a quantity equal to the permitted quantity in the expired permit, unless the Department demonstrates by a preponderance of the evidence that the quantity above maximum withdrawals during the permit term are not necessary to meet the permittee's future need.
S.C. Code Regs. § 61-119.K