(2) The board of directors shall determine the number of irrigable acres owned by each landowner in the district and the proportionate assessments as nearly as may be from available information. If a substantial error is made in the determination, proper adjustment may be made at the next equalization of the annual assessment by increasing or decreasing the amount any landowner shall pay. Any lands owned by any person totaling less than one acre in area shall be assessed as one acre.
(3) Until such time as the water rights appurtenant to any tract of land within an irrigation district are acquired by the district, the assessments against that land, except for operation, maintenance and drainage, shall be in the same proportion to a full assessment as the additional water right to be supplied to the tract bears to a full water right. For operation, maintenance and drainage, each irrigable acre in the district shall be assessed the same, except as otherwise provided in ORS 545.387, 545.389, 545.391 and 545.413. [Formerly 545.432; 2001 c.215 §19]