Iowa Code § 468.391: Manner of cooperation.

Any United States government levee under the conditions mentioned in section 468.390 may be taken into consideration by the board as a part of the plan of any levee or drainage district and improvements therein, and such board may, by agreement with the proper authorities of the United States government, provide for payment of such just and equitable portion of the costs of procuring the right-of-way and maintenance of such levee as shall be conducive to the public welfare, health, convenience, or utility.