Okla. Stat. tit. 82 § 1324.26
Any district created for one of the authorized purposes of this act may enlarge its purposes and powers by following the procedure set forth herein: The board of directors of the district shall adopt a resolution to enlarge the purposes and powers of the district and the resolution shall specifically state such additional purposes and powers. The district shall file a petition for enlargement of the purposes and powers of the district with the county clerk and a certified copy of the resolution for enlargement shall be attached to the petition. The county clerk shall thereupon give notice to the board of county commissioners of the filing of said petition and the board of county commissioners shall forthwith enter its order setting a public hearing upon said petition for a day certain and directing the county clerk to give notice of said hearing by legal publication in the manner described by Section 1324.5 of this title. Such notice shall contain a brief and concise statement describing the purpose of the hearing and the time and place set for the hearing and consideration of the petition. It shall be the duty of the board of county commissioners to determine:
If, upon such consideration, it shall be found that the purposes and powers of the district should be enlarged, the board of county commissioners shall enter upon its records, full minutes of such hearing, together with its order enlarging the purposes and powers of the district. Such order shall also change the name of the district to disclose the purposes of the district, and the name of the district shall be indicated in the manner set forth in Section 1324.6 of this title.
Okla. Stat. tit. 82, § 1324.26