ORS § 541.120
No tract or parcel of improved or occupied land in this state shall, without the written consent of the owner, be subjected to the burden of two or more ditches, canals, flumes or pipelines constructed under the Act of 1899, pages 172 to 180, Oregon Laws 1899, for the purpose of conveying water through the property, when the same object can be feasibly and practically attained by uniting and conveying all the water necessary to be conveyed through such property in one ditch, canal, flume or pipeline. Any person having constructed a ditch, canal, flume or pipeline for the purpose provided in the Act of 1899 shall allow any other person to enlarge such ditch, canal, flume or pipeline, so as not to interfere with the operations of the person owning the same, and to use such ditch, canal, flume or pipeline in common with the person owning the same, upon payment to such person of a reasonable proportion of the cost of constructing and maintaining the ditch, canal, flume or pipeline. Such persons shall be jointly liable to any person damaged.
ORS 541.120