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<br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />II <br /> <br />, <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />2467 <br /> <br />1.2.1 Navaio Indian Irrigation Prolect <br /> <br />The Navajo Indian Irrigation Project (NIlP) sU\:l\:llies irrigation <br /> <br />water to over 100,000 acres of reservation land south of Farmington, <br /> <br />New Mexico. <br /> <br />Water is tak.en from the Navajo reservoir on the San Juan <br /> <br />River and diverted through approximately 70 miles of open canals, <br /> <br />siphons and tunnels to the project area, <br /> <br />Peak di version capaci ty to <br /> <br />the project area is IBOO cfs. <br /> <br />A consumptive use study on the NIIP was <br /> <br />completed in September, 19B3 by Brian Boman of the USBR.~I His work. <br /> <br />consisted of three years of data collection (lysimeter, soil <br /> <br />moisture and climatic data) and the calibration of Jensen-Haise and <br /> <br />Penman reference ET equations. <br /> <br />He also developed crop coefficient <br /> <br />curves and water use production functions for the different crops. <br /> <br />The modified Jensen-Haise equation developed for the NIl? is~ <br /> <br />ETr = .015 (T-21) Rs (1) <br /> <br />Where ETr is in inches per day, T is the average daily 'temperature in <br /> <br />degrees F and Rs is solar radiation in langleys (ly). <br /> <br />This equation <br /> <br />is used for comparison in Section IV of this chapter. <br /> <br />The wa ter use <br /> <br />production function for alfalfa at 12% moisture content is: <br /> <br />Y = 0.0 + ,19 ET (t/ac/in) <br /> <br />(2 ) <br /> <br />This equation relates the crop evapotranspiration (ET) to the crop <br /> <br />yield (Y) as discussed later in the section on consumptive use <br /> <br />methodology. <br /> <br />1- 4 <br />