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Because the CIR varies throughout the growing season, water use and consumption also changes throughout the growing season. To develop a trust water right schedule that more accurately reflects growing conditions, the monthly CIR provided in the WIG was used to determine the consumptive and nonconsumptive use over the course of the growing season. To find total use (total irrigation requirement or TIR), the CIR was divided by the application efficiency. The TIR multiplied by the number of acres irrigated represents the water that will be available in the primary reach. The consumptive use was found by multiplying the TIR by the consumptive use ratio of 65.13% for May through August, with a 5-percent consumptive use ratio (attributed to evaporation) before May 1. The Table 3a and Table 3b below shows how much nonconsumptive and consumptive water is available for change by month. Table 3a: Total Irrigation Requirement (TIR)* Unit March Apr May Jun Jul Aug Average Qi cfs 0.98 0.98 0.36 0.81 1.08 0.86 Qa acre-feet 29.04 58.08 21.91 48.42 66.35 25.62 * Up to 0.98 cfs; 58.08 acre-feet are available for a 30-day period during the spring time when all other users are satisfied. This quantity was added to the period between March 15 and April 14. The consumptive use calculations assume 5-percent evaporative loss. Table 3b: Consumptive Use Unit March Apr May Jun Jul Aug Average Qi cfs 0.05 0.05 0.23 0.53 0.70 0.56 Total 249.42 Total Qa acre-feet 1.45 2.904 14.27 31.54 43.21 16.69 110.06 Trust Water Place of Use Ecology typically manages its trust water rights by defining a primary and a secondary reach. The primary reach is th'e length of stream between the historic point of diversion and the furthest downstream location where irrigation return flows reentered the river. The secondary reach is the portion of the stream that received return flow waters while the water right was exercised for its original out-of-stream purpose. Below is a description of the primary and secondary reach for this trust water right. Primary Reach Based on the location of the point of diversion and where return flows generally return to the system, the primary reach begins at the historical point of diversion located at 600 feet south and 200 feet east from the north quarter corner of Section 18, being within the NW¼NE¼NE¼ of Section 19, T. 18 N., R. 20 E.W.M,, and continues down Cooke Creek to its confluence with a side channel locally known as Trail Creek at a point approximately 900 feet south of the center of Section 19, T. 18 N., R. 20 E.W.M. Secondary Reach The secondary reach for this trust water right begins at the point where a side channel locally known as Trail Creek crosses the KRD canal at a point approximately 2,250 feet west and 1,000 feet north of the southeast corner of Section 18, T. 18 N., R. 20 E.W.M., and continues down Trail Creek to its confluence with Cooke Creek, down Cooke Creek until Cooke Creek is intercepted by Cherry Creek, down Cherry Change Report of Examination Page 10 of 15 Water Right File No. CS4-01141sb10