The land to be occupied by the district for its right-of-way and the land or other property to be taken or used for any drainage purposes shall not be subject to assessment for benefits. In describing lands in their assessment rolls, the commissioners shall not be required to describe the same in 40 acre tracts, but they may include in a single description all of the land owned by the same individual or the same group of individuals situated in the same section, or they may use the same descriptions as those used in the Collector's books if such descriptions are otherwise adequate and correct.
The assessment roll shall be accompanied by an affidavit stating (a) that diligent inquiry and search of public records have been made by the commissioners, or by someone acting under their direction, to determine the names and addresses of the owners of land within the district and subject to assessment; (b) that a careful examination was made of the Collector's books to ascertain the names and addresses of the persons who last paid the general taxes on any lands for which the names and addresses of the owners are unknown; and (c) that such names and addresses are set forth in the assessment roll. The affidavit may be made by the commissioners or by the person who made the search under their direction.
70 ILCS 605/5-3