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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />2464 <br /> <br />SECTION A-l <br />NET CROP WATER REQUIREMENTS <br /> <br />1.1 INTRODOCTION <br />1.1.1 Purpose and Scope <br />The purpose of this task is to identify a consumptive use methodology <br />suitable for estimates of crop evapotranspiration in southwest <br /> <br />Colorado. <br /> <br />It includes a review and discussion of the more common <br /> <br />predictive equations and sample calculations using measured and <br /> <br />deri'Ved climatic data at a weather station in the project area. Mean <br /> <br />data are used for all calculations except precipi tation in which a 60 <br />percent recurrence interval is used in effective precipitation <br />calculations. Discussions of crop coefficients, yield and ET <br />correction factors and other parameters affecting irrigation <br />requirements are included. It does not include the determination of <br />consumptive use for all crops at all locations for all methods. <br /> <br />1.1.2 Location and Climate <br /> <br />The study area is located in southwest Colorado on lands belonging to <br /> <br />the Ute Mountain Ute and Southern Ute Indian Reservations. <br />Approximately 1700 square miles of reservation land are in the <br /> <br />project area. <br /> <br />They are bordered on the west by the Utah state line <br /> <br />and on the south by the New Mexico state line. <br /> <br />They include portions <br /> <br />of Montezuma, LaPlata and Archuleta Counties and lie south of the <br /> <br />cities of Cortez, Durango and Pagosa Springs. <br /> <br />Lands are in the <br /> <br />1- 1 <br />