Okla. Stat. tit. 82 § 564
The secretary shall be the custodian of the records of the district and of its corporate seal and shall assist the board in particulars as it may direct in the performance of its duties. It shall be the duty of the secretary to attest, under the corporate seal of the district, all certified copies of the official records and files of the district that may be required of the secretary by the provisions of this act, or by any person ordering the same and paying the reasonable cost of transcription and any portion of the record so certified and attested shall be prima facie evidence of the facts contained in the record. The secretary shall serve also as treasurer of the district, unless a treasurer is otherwise provided for by the board. The board may also employ a district manager and any engineers, attorneys or other staff as may be useful and necessary. The board may provide for compensation of employees of the board, which, with all other necessary expenditures, shall be taken as a part of the cost of the improvement. The employment of persons or entities by the district shall be evidenced by agreements in writing which shall specify the amounts or rates to be paid for their services. The district manager shall be superintendent of all the works and improvements, and shall make a full report to the board each year, or more often if required by the board, and may make suggestions and recommendations to the board as the manager may deem proper.
Okla. Stat. tit. 82, § 564