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Because the CIR varies throughout the growing season, water use and consumption also changes <br />throughout the growing season. To develop a trust water right schedule that more accurately reflects <br />growing conditions, the monthly CIR provided in the WIG was used to determine the consumptive and <br />nonconsumptive use over the course of the growing seasoR. To find total use {total irri8ation <br />requirement or TIR), the CIR was divided by the application efficiency, The TIR multiplied by the number <br />of acres irrigated represents the water that will be available in the primary reach, The consumptive use <br />was found by multiplying the TIR by the consumptive use ratio of 65.13% for May through August, with a <br />s-percent consumptive use ratio (attributed to evaporation) before May 1. <br />The Table 3a and Table 3b below shows how much nonconsumptive and consumptive water is available <br />for change by month. <br />Table 3a: Total lrrigation Requirement (TlR)* <br />Unit March Apr May Jun Jul Aug Total <br />Average Qi <br />Qa <br />cfs <br />acre-feet <br />0.98 <br />29.44 <br />0.98 <br />58.08 <br />0.36 <br />2r.97 <br />0.8r_ <br />48.42 <br />L.08 <br />66.35 <br />0.86 <br />25.62 249.42 <br />* Up to 0,98 cfs; 58.08 acre-feet are avallable for a 30-day period during the sprlng time when all other use rs a re <br />satisfled. Thls quantity was added to the period between March 15 and April 14. The consumptive use cafculations <br />assume 5-percent evaporative loss. <br />Table 3b: Consumptive Use <br />Unit March Apr May Jun Jul Aug Totai <br />Average Qi <br />Qa <br />cfs <br />acre-feet <br />0.0s <br />2.904 <br />0.23 <br />1"4.77 <br />0.53 <br />31_,54 <br />o.70 <br />43.27 <br />0.56 <br />1.5.69 1r.0.06 <br />0.05 <br />L.45 <br />Trust Water Place of Use <br />Ecology typically manages its trust water rights by defining a primary and a secondary reach. The <br />primary reach is the length of stream between the historic point of diversion and the furthest <br />downstream location where irrigation return flows reentered the river. The secondary reach is the <br />portion of the stream that received return flow waters while the water right was exercised for its <br />original out-of-stream purpose. Below is a description of the primary and secondary reach for this trust <br />water right. <br />Primdry Reach <br />Based on the location of the point of diversion and where return flows generally return to the system, <br />the primary reach begins at the historical point of diversion located at 600 feet south and 200 feet east <br />from the north quarter corner of Section 18, being within the NW%NE%NE% of Section 19, T. 18 N., <br />R. 20 E.W.M., and continues down Cooke Creel< to its confluence with a side channel locally known as <br />Trail Creek at a point approximately 900 feet south of the center of Section 19, T. 18 N., R. 20 E.W.M. <br />Secondary Reach <br />The secondary reach for this trust water right begins at the point where a side channel locally known as <br />Trail Creek crosses the KRD canal at a point approximately 2,250 feet west and 1,000 feet north of the <br />southeast corner of Section L8, T. L8 N., R. 20 E.W,M., and continues down Trail Creek to its confluence <br />with Cooke Creek, down Cooke Creek until Cooke Creek is intercepted by.Cherry Creek, down Cherry <br />Change Report of Examination Page 10 of 15 Water Right File No. C54-0U41sb10