Indiana Code Title 36. Local Government § 36-9-27-42

Sec. 42. (a) The board may at any time increase or decrease the amount annually assessed for periodic maintenance of a regulated drain if the board finds that the county surveyor's estimate of the cost of maintaining the drain was insufficient or excessive.

(b) The board may decrease the amount annually assessed without notice to the affected owners if the percentage of benefit assigned to all tracts of land affected is not changed from that originally determined by the board.

(c) The board may increase the amount annually assessed once without notice to the affected owners if:

(d) If the board:

the board shall mail a notice to the owner or owners of the land.  The notice must state the proposed change in the assessment, and specify a date, time, and place, not less than ten (10) days after the notice is mailed, when the board will hear objections to the change.  An owner may file written objections to the proposed change on or before the date of the hearing.  At the hearing, the board shall consider all objections and evidence filed and shall enter an order as justice may require.  The board shall mail a copy of its order to the owner or owners affected.  If an owner does not request judicial review of the order under section 106 of this chapter within twenty (20) days after the owner's receipt of the copy of the order, the order becomes conclusive.

(e) A joint board that includes three (3) or more counties in a drainage basin that exceeds one hundred thousand (100,000) acres shall publish notice in accordance with IC 5-3-1 instead of mailing notice to the owner or owners of land as required by subsection (d).