Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 547.210

(1) The chief engineer shall make a report in writing to the board of supervisors whenever the board requires. Upon receipt of the final report of the engineer concerning surveys made of the lands contained in the district, and plans for reclaiming the same, the board shall adopt the report or any modification thereof approved by the chief engineer. The adopted report shall be the plan for draining and reclaiming such lands from overflow or damage by water, and shall be known and designated as the “Plan for Reclamation.” The plan shall be filed with the secretary of the board of supervisors and by the secretary copied into the records of the district.

(2) Any lands included in the district, which will not be reclaimed or benefited by the construction of the work as specified in the plan for reclamation, may be excluded from the district by order of the county court. Any charge billed to an owner of land so excluded shall be refunded to the person paying the same. However, any irrigated lands contributing to the wet, swamp or overflowed condition of any lands of the district, the waste or seepage waters from which lands will be carried by and disposed of through the works specified in the plan for reclamation, shall be deemed benefited by the construction of the works as specified in the plan.