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CHAPTER II <br />BACKGROUND 1 <br />The GVIC junior right (120 cfs) is senior to several major projects, most of which have <br />replacement storage available. <br />2) ORCHARD MESA IRRIGATION DISTRICT <br />- Private irrigation district serving approximately 9,000 acres south of the <br />Colorado River. <br />- Primarily a pumped system, no storage. <br />- Uses hydraulic turbine pumps to lift irrigation water to service area. <br />- Shares powerplant revenues with Grand Valley Water Users' Association. <br />- Operates "check" and bypass channel to avoid calls by GVIC and to maximize <br />power generation. <br />- At maximum irrigation-season diversion and usage levels, OMID can demand <br />up to 460 cfs for irrigation/pumping and 310 cfs for hydroelectric power. <br />- At less than full irrigation demand, up to 400 cfs can be used to generate <br />hydroelectric power. <br />- In winter, and when irrigation demand by others diminishes, OMID can <br />increase its hydroelectric power demand until the power canal reaches capacity <br />of about 860 cfs. <br />- Relies on Green Mountain Reservoir storage for irrigation water when natural <br />supplies are insufficient. <br />3) GRAND VALLEY WATER USERS' ASSOCIATION <br />- Serves approximately 32,000 acres including two small irrigation districts of <br />the north Colorado River, above GVIC service area. <br />Gravity system, negligible storage. <br />Created to operate the U.S. Reclamation Service's Grand Valley Project. <br />Shares power revenues with OMID. <br />- Has diversion protected by OMID operating "check." <br />- Has capacity to demand 850 cfs for irrigation, including service to two small <br />irrigation districts with senior rights totaling 120 cfs. <br />Relies on Green Mountain Reservoir storage for irrigation when natural <br />supplies are insufficient. <br />The Grand Valley Water Users' Association, the Orchard Mesa Irrigation District (OMID), <br />the Palisade Irrigation District (PID), and the Mesa County Irrigation District (MCID) all <br />divert from the Colorado River at the Government Diversion Dam. This dam in known <br />locally as the Roller Dam, the Cameo Dam or the Cameo Diversion. <br />8 (Revised 3/92)