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Navajo Reservoir Diversions <br />Month Diversions <br /> (acre-feet) <br />April 27,100 <br />May 52,100 <br />June 67, 800 <br />July 70,000 <br />August 76,400 <br />September 44,300 <br />October 19,300 <br />Total 3 57,000 <br />Based on inspection of topographic maps of the NIIl' project area, it was determined that 100 <br />percent of the return flows from the NIIP irrigation will accrue to the San Juan River. The <br />specific location to which the returns will occur is dependent upon the level of development of <br />blocks 1 through 11. During the initial CRDSS study period (1975 through 1991), the locations <br />of the return flows from the NIlP (blocks 1 - 7) are estimated as follows: <br />1. Above USGS Gage 09365000 (San Juan at Farmington) 41 percent <br />2. Above USGS Gage 09368000 (San Juan near Shiprock) 59 percent <br />After full development of the remaining NIIP blocks 8 - 11, the pattern of return flows will <br />shift as follows: <br />1. Above USGS Gage 09365000 (San Juan at Farmington) 40 percent <br />2. Above Diversion for San Juan Power Plant 30 percent <br />3. Above USGS Gage 09379500 (San Juan at Bluff) 30 percent <br />San Juan Power Plant. The San Juan Power Plant is operated by Public Service of New <br />Mexico (PNM) and is located on the north side of the San Juan River about 13 miles west of <br />Farmington. The facility includes four coal-fired generation units with a capacity of 1,780 net <br />megawatts. Water for the operation of the plant is obtained pursuant to a 20-year contract <br />(through year 2005) with the USBR for storage water in Navajo Reservoir. The contract is for <br />16,200 acre-feet per year, which closely matches the current water demand for the operation of <br />the power plant. For the purposes of the San Juan Model, it is assumed that the annual demand <br />of 16,200 acre-feet is evenly distributed throughout the year (1,350 acre-feet per month). The <br />diversion is 100 percent consumptive, with no return flows to the San Juan River. These <br />assumptions were confirmed with personnel at PNM. <br />As a back-up to the Navajo Reservoir storage contract, the San Juan Power Plant also has a <br />contract to lease an additional 8,000 acre-feet from Broken Hill Properties (BHP), the operator <br />of most of the coal mines in the area. This water derives from a permitted New Mexico water <br />San Juan & Dolores River Basin Information 2-24 <br />