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~, <br />Instream Temperature Model """DRAFT " "` <br />Page 8 <br />March 27, 1989 <br />and at required nodes. The regressions were used at headwater nodes <br />to determine initial water temperatures and at validation nodes for <br />measuring the performance of the transport model. When there is a <br />difference between observed for regressed) and predicted water <br />temperatures, it must be assumed that both temperatures are <br />incorrect, because errors exist in both the regression and transport <br />models. However, validation of the model suggests a high degree of <br />reliability and indicates areas within the network to look for <br />improvement in the predictive capabilities of the model. Finally, <br />validation indicates the Temperature Model can be used as a tool for <br />evaluating instream temperatures as a function of Reservoir <br />operations at Flaming Gorge. <br />An appendix including all model input files and output tables is <br />available from the Regional Hydrologist, Region Six, Lakewood, <br />Colorado. <br />Recommendations <br />Changes in the operation of Flaming Gorge Reservoir will require a <br />new set of discharge and temperature data. Water temperature would <br />have to be regressed against discharge and physical climatic factors <br />to obtain this set. However, if the reservoir discharge outlet <br />level is changed, a separate reservoir - water temperature stratifi- <br />cation study would have to be completed to obtain an accurate set of <br />water temperature and discharge data. Therefore, the necessary <br />operation criteria for Flaming Gorge should be acquired as soon as <br />possible so this effort can begin. <br />