Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 553.380

In the event that it is determined after the construction of any works within a subdistrict that the benefits received by any tract of land are materially less than the appraised benefits, the board may, upon the petition of any owner of a tract of land, hold a hearing on the question of whether the benefits should be reduced. The board shall give notice by mail 30 days prior to such hearing to all other owners of land within the subdistrict. After hearing evidence for and against the reduction of benefits assessed against the tract of land in question, the board shall make an order reducing the amount of assessed benefits or dismissing the petition.