Iowa Code § 468.152: Waste banks — private use.

The landowner may have any beneficial use of the land to which the landowner has fee title and which is occupied by the waste banks of an open ditch when such use does not interfere in any way with the easement or rights of the drainage district as contemplated by this subchapter, parts 1 through 5. For the purpose of gaining such use the landowner may smooth said waste banks, but in doing so the landowner must preserve the berms of such open ditch without depositing any additional dirt upon them.