The board of supervisors of any county described in Section 59-13-1 shall have authority to employ competent engineers or architects to make necessary plans and specifications for such harbor improvements and buildings which the board may deem necessary and proper to be constructed in connection therewith and said plans and specifications, after the same have been approved by said board, shall be filed with its clerk and the board shall adopt an order to be spread upon its minutes giving notice of its intention to issue bonds to provide funds for such improvements, or any of them, as shown by said plans and specifications.