If a plat sought to be vacated lies within the platting jurisdiction of a municipality or county which has in existence a statutory planning commission, said plat may be vacated pursuant to the procedures outlined in §§ 11-3-20.2 to 11-3-20.4 , inclusive. Source: SL 1974, ch 109 , § 3; SL 1979, ch 93 , § 12.