Cal. Water Code § 7009

The court shall determine the manner in which all improvements, repairs, maintenance and other matters relating to the conduit, well, or pumping plant shall be authorized, and thereafter no user of such conduit, well, or pumping plant may make claim for any funds expended for improvements, repairs, maintenance and otherwise except as determined by the court in said action. No authorization for such claim shall be valid except as made under the authority set forth by the decree or judgment of the court.