The duties of the supervising engineer shall be the same in all respects as is provided by subchapter I, parts 1 through 5 , for districts wholly within one county. [S13, §1989-a34; C24, 27, 31, 35, 39, § 7617; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §457.19 ] 89 Acts, ch 126, §2 CS89, §468.288