Utah Code § 73-1-9: Contribution between joint owners of ditch or reservoir.

When two or more persons are associated in the use of any dam, canal, reservoir, ditch, lateral, flume or other means for conserving or conveying water for the irrigation of land or for other purposes, each of them shall be liable to the other for the reasonable expenses of maintaining, operating and controlling the same, in proportion to the share in the use or ownership of the water to which the person is entitled.