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<br />u02186 <br /> <br />irrigation from the supply presented in the DPR: During nonnlllllnd dry ~riods. McPhee Reservoir will o~nlte at <br />slightly lower elevations and provide less carry-over storage for use during succeeding years. Also, more water <br />would be released downstream to the Dolores River during dry period. nus will resull in increased incidents of <br />shortages to the irrigation water supply aDd increased severity of shortages during extended drought periods. During <br />wet periods, McPhee Reservoir would operate at slightly higher elevations and provide more carry-over storage for <br />use during succeeding years. However, the long term average annual water supply available for irrigation would only <br />be reduced by approximately 1 % as compared to the no action altemative, There would be no affect on the M&I <br />water supply or the fish and wildlife development water supply. <br /> <br />Potential future return flows to McElmo Creek, Montezul1Ul Creek. Ilnd the San Juan River would be slightly <br />decreased. <br /> <br />No Action - Implementation of the no action alternative would slightly decrease the Project water supply for irrigation <br />from the supply presented in the DPR due to the discrepancy in the 1977 Project operation study as presented in the <br />background section of this document. <br /> <br />Navajo Nation <br /> <br />Proposed Action - implementation of the propos~ action would slightly ot:!cease potential future return flows to <br />McEimo Creek and the San JURn River. <br /> <br />No-Action - implementation of the no action would hllvt:! no ~rceivllble affect on the Navajo Nlltion. <br /> <br />H. HYDROELECTRIC GE~ERA TIO~ <br /> <br />AFFECTED E?'i\ 'IRO:-'?\- IEl'. "T <br /> <br />A 1.35 megawat: baseioad powerpiant is ioeated on the outiet works of McPhee Dam and Po 1:.: megawar: baseioad <br />powerplant is located on the initial reach of the Towaoc Canal. Tile power produced enters the Coioracio River <br />Storage Project System ror distribution to the points of use. linder the D?R!FES operating criterill. an average of <br />37,488,000 kilowan hours (kVv-n) or energy is produced alU1W\liy. aoout ::.49LOOO k\\rn in excess of the Pro.iec:'s <br />requirement. <br /> <br />McPhee Dam Powerpiant operates year-round using fishery reieases Rnd water released in lUlticipation of spills. Tne <br />plant contains two turbines designed for variable head. one designed for optimum fiow of 25 cfs and ODe designed for <br />optimum flow of 50 cfs although each can be operated over l!. limited ra.nge of flows. Tne ttlrbines can be operated <br />separately or together to optimize power generation over 8 lRrge range releases. Water is supplied to the turbines <br />from the selective level outlet works. linder the DPRlFES criteria, the powerpiRnt would generate IUl avera.ge of <br />7,170,000 kWh annually, <br /> <br />The Towaoc Canal Powerplant operRte~ from about mid.-April to mid-October using irriglltion water destined for use <br />by the MVIC and the Ute Mountain Ute Tribe. The plan: consists of one generating unit designed for II constant head <br />and fluctuating flows of about 40 t0475 cfs. The powerpiRnt generates IIn Rverage of 30.318.000 kWh annually. <br /> <br />~J <br />