Indiana Code Title 36. Local Government § 36-9-27-109

Sec. 109. (a) All petitions, evidence, requests, and other documents required to be filed with the board under this chapter, including all material and documents of every kind prepared by the county surveyor or on the surveyor's behalf, shall be filed in the office of the surveyor, who shall receive them for the board.  The surveyor shall:

(b) The county surveyor shall maintain the documents described in subsection (a) in permanent files under the name of each regulated drain in the county.  These copies shall be made available to the trial court, the supreme court, or the court of appeals in any proceedings pending under sections 106, 107, and 108 of this chapter.

(c) The county surveyor shall maintain a copy of each document described in subsection (a) for the use of the board.

(d) Whenever this chapter permits the filing of written evidence with the board, that evidence shall be subscribed to under oath by the person or persons having knowledge of the facts contained in the evidence.