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<br />QO.09~6 <br /> <br />Comparisons of diversion records between the two simulations show similar results to the streamflow <br />comparison with the revised hydrology simulations showing improved comparisons to historic <br />diversion records upstream of Hayden and deterioration of the comparisons in the lower Yampa <br />(particularly the Williams Fork Basin). The average annual differences in diversion amounts between <br />the two simulations were typically small (less than 100 at). The bottom line is that the simulation with <br />revised baseflow hydrology had increased diversion shortages (when compared to the Phase II <br />simulation) of about 2,600 af on an average annual basis (1975-1991) but that this represents only <br />about .4 percent of the diversions historically recorded in the basin. <br /> <br />In summary, the baseflow hydrology in the Yampa River Basin model has been improved through the <br />application of a consistent and documented process. The model is better suited than the Phase II <br />model to "what ifs" scenarios that may involve imposing additional demands in the model. The <br />accuracy of calibration achieved in the Phase II model was not significantly affected by the revision <br />of base flow hydrology. <br />