Iowa Code § 468.366
If, before a district operating a pumping plant is completed and accepted, it appears that portions of the lands within said district are wet or nonproductive by reason of the floods or overflow waters from one or more streams running into, through, or along said district and that said district or some other district of which such district shall have formed a part, shall have provided a settling basin to care for the said floods and overflow waters of said stream or watercourse, but no channel to said settling basin has been provided, said board or boards are hereby empowered to lease, buy, or condemn the necessary lands within or without the district for such channel. Proceedings to condemn shall be as provided in chapter 6B for the exercise of the right of eminent domain.
Iowa Code § 468.366