Road graded and drained.

Any such secondary road shall be built to permanent grade and drained in a manner approved by the county engineer before being surfaced, as provided in this chapter . [C27, 31, 35, 39, § 4746; C46, §311.3; C50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §311.22 ]