Iowa Code Title XI. Natural Resources [Chs. 455-485] § 455B.264. Jurisdiction--water and floodplains

1. The department has jurisdiction over the public and private waters in the state and the lands adjacent to the waters necessary for the purposes of carrying out this part. The department may construct flood control works or any part of the works. In the construction of the works, in making surveys and investigations, or in formulating plans and programs relating to the water resources of the state, the department may cooperate with an agency of another state or the United States, or with any other person.

2. Upon application by any person for permission to divert, pump, or otherwise take waters from any watercourse, underground basin or watercourse, drainage ditch, or settling basin within this state for any purpose other than a nonregulated use, the director shall investigate the effect of the use upon the natural flow of the watercourse, the effect of the use upon the owners of any land which might be affected by the use, the effect of the use upon prior users of the water source and contracts made under section 455B.263 and whether the use is consistent with the principles and policies of beneficial use.

3. Upon application by any person for approval of the construction or maintenance of any structure, dam, obstruction, deposit, or excavation to be erected, used, or maintained in or on the floodplains of any river or stream, the department shall investigate the effect of the construction or maintenance project on the efficiency and capacity of the floodway. In determining the effect of the proposal the department shall consider fully its effect on flooding of or flood control for any proposed works and adjacent lands and property, on the wise use and protection of water resources, on the quality of water, on fish, wildlife, and recreational facilities or uses, and on all other public rights and requirements.