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Other Irfi att' ion Systems: Two irrigation districts, Palisade and Mesa County Irrigation Districts, also receive water from the Government Highline Canal through a carriage contract. The operation of these systems is not included in the on-going Grand Valley Water Management Study. The Garfield Gravity Division: Through the Garfield Gravity Division the GVWUA delivers water to approximately 1,400 water users. The GVWUA system serves approximately 24,000 (10,500 ha) of the 70,000 (28,300 ha) irrigated acres in the Grand Valley. The Gravity Division's Government Highline Canal delivers water to 74 laterals totalling about 160 mi. (257.5 km). After completion of the Salinity Control Program, 30 mi. (48 km) of the 50 mi. (80.5 km) of canal will be lined and nearly all of the laterals are scheduled to be placed in. pipe. As shown in Fig. 1, 45 mi. (72 km) of the Government Highline Canal is divided into four sections. Beginning at the outlet of Tunnel No. 3 and moving west, the sections are; the Fast End Government Highline Canal, Middle Government Highline Canal, Stage One, and West End Government Highline Canal. All of these canal reaches, except the Middle Government Highline Canal, will be lined as part of the Colorado River Salinity Control Program to control seepage. Plans are to place all laterals, including those served by the Middle Government Highline Canal, in pipe. East End Government Highline Canal: The first 10 mi. (16 km) of the Government Highline Canal is referred to as the East End Government Highline Canal (East End). The initial design capacity of the canal is about 850 ft31s (24.1 m3/s). This portion of the canal also serves the lands of Mesa County and Palisade Irrigation Districts. About 120 ft3/s (3.4 m3/s) is deliv- ered to the districts during the irrigation season. Portions of the East End have been membrane lined with the remainder scheduled to be lined by 1996. Middle Government Highline Canal: The next reach of the Govern- ment Highline Canal is the Middle Government Highline Canal. The design capacity at the beginning of this section is 730 ft3/s (20.7 m3/s). The 20 mi. (32 km) of canal delivers water to 54 laterals and about 12,300 ac (4,980 ha). It is an unlined canal with no check structures. The required water surface elevation in the canal is maintained by adjusting the amount of water in the canal. The Middle Government Highline Canal is not scheduled for improve- ment. Stage One: The next 7 mi. (I l km) of the Government Highline Canal is called Stage One. The design capacity of the beginning of Stage One is 360 ft3/s (10.2 M3/S) . This section of canal delivers water to 12 laterals and about 6,300 ac (2,550 ha). All the laterals in this section of canal have been placed