04 NCAC 11 R06-02
(k) "Cubic foot" of gas as used in these rules shall have the following meanings:
(m) The abbreviations used, and their meanings, shall be as follows:
(4) W.C. — Water Column.
(NCUC Docket No. G 100, Sub 9, 7/26/67; NCUC Docket No. G-100, Sub 90, 4/29/11.)