Parker Water and Sanitation District, a Colorado special district, Applicant-Appellant: v. Kevin G. Rein, in his official capacities as the State Engineer for the State of Colorado and Director of the Colorado Division of Water Resources; Colorado Division of Water Resources; and Corey DeAngelis, in his official capacity as the Division Engineer for Division 1; Appellees: and Meridian Metropolitan District, Arapahoe County Water and Wastewater Authority, East Cherry Creek Valley Water and Sanita