Iowa Code § 468.339: Survey and report.

The engineer shall make a survey of the proposed district and report the same to the board, being governed in all respects as provided by sections 468.11 and 468.12 and designate particularly any portion of the secondary road system, or the primary road system, or any portion of either or both of said systems, as well as all lands adjoining and adjacent thereto, including lands and rights-of-way of railway companies which in the engineer’s judgment will be benefited by drainage of highways in such district, and which should be embraced within the boundaries of such district.