The board of directors shall have full power and authority to devise, prepare for, execute, maintain and operate any or all works or improvements necessary or desirable to complete, maintain, operate and protect the official plan. They may secure and use men and equipment under the supervision of the chief engineer or other agents, or they may in their discretion let contracts for such works, either as a whole or in parts.
Okla. Stat. tit. 82, § 566