Iowa Code § 468.397
In the establishment and maintenance of levee and drainage districts in cooperation with the United States as in this part provided, all the proceedings in the filing and the form and substance of the petition, assessment of damages, appointment of an engineer, the engineer's surveys, plats, profiles, and report, notice of hearings, filing of claims and objections, hearings, appointment of commissioners to classify lands, assess benefits, and apportion costs and expenses, report, notice and hearing on the report, the appointment of a supervising engineer, the engineer's duties, the letting of work and making contracts, payment for work, levy and collection of drainage or levee assessments and taxes, the issue of improvement certificates and drainage or levee bonds, the taking of appeals and the manner of trial of appeals, and all other proceedings relating to the district shall be as provided in subchapter I, subchapter II, parts 1 through 5, subchapter III, subchapter IV, parts 1 and 2, and subchapter V except as otherwise in this part provided.
Iowa Code § 468.397
83 Acts, ch 101, §101; 89 Acts, ch 126, §2