Iowa Code § 468.585: Definitions.

As used in this part, unless the context otherwise requires:

1. “Drainage improvement” includes the construction, improvement, or repair of the principal structures, works, component parts and accessories of a storm sewer, drainage conduit, channel, or levee for the collection, detention, or discharge of drainage or surface waters.

2. “Urban drainage district” or “district” means a district defined by a county and one or more cities within the county pursuant to an agreement entered into by the county and cities in accordance with chapter 28E and this part with respect to drainage improvements which the county and cities determine benefit the property located in the cities and the designated unincorporated area of the county.

3. “Cost” means the same as defined in section 384.37, subsection 26.