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<br />., <br />;.~ v <br /> <br />To present a summary of the results of our studies, we have prepared <br />a set of graphs as overlays. We have not attempted to present every study, <br />however I believe that these graphs indicate the various comments set forth <br />in Mr. Goslin's report. <br /> <br />GraDh 1 is a year by year plotting of energy generated at Glen Canyon <br />from our study in which we assume consumptive use requirements downstream <br />from Hoover to be 7.7 maf, Glen Canyon power plant is operated at 80% <br />efficiency and Hoover at 83% efficiency. <br /> <br />GraQ,h 2 is similar to Graph 1 except it is from a study in which <br />downstream requirements were assumed to be 8.5 maf instead of the 7.7 maf. <br />The pwPose of this overlay is to show that the lower the requirement for <br />downstream use below Hoover the greater the energy generation at Glen <br />Canyon. Overlaying Graph 2 on Graph 1 illustrates the pOint presented as <br />number 1 on page 11 of Mr. Goslin's report. <br /> <br />GraDhs 3 & 4' are designed to indicate the effects of the assumed <br />efficiency at Hoover in computing "Basic Finn" upon Glen Canyon. As <br />indicated previously these graphs are based upon the assumption that Hoover <br />"Basic Firm" will be made whole from generation at Glen Canyon. Also, it <br />1S assumed that energy actually generated at Hoover in excess of its "Basic <br />firm" will be credited to Glen Canyon. Graph 3 shows year by year that <br />energy that would be creditable to Glen Canyon if Hoover Basic Firm were <br />Computed at 83% effiCiency, Hoover were operated in the system at 83% <br />effiCiency, and downstream requirements were 7 . 7 maf per year. Overlaying <br />Graph 3 on Graph 1 indicates the effect on Glen Canyon energy of making , <br />Hoover Basic Firm whole. <br /> <br />GraDh 4 is si milar to Graph 3 except that in computing the energy <br />make up Hoover "Basic Firm" was computed at 70% effiCiency. Overlaying <br />Graph 4 on Graph 3 indicates the effect that the effiCiency factor used to <br />compute Hoover Basic Firm has on the energy creditable to Glen Canyon. <br />These graphs illustrate the point made in the first part of item 2 on page 11 <br />of Mr. Goslin's report. <br /> <br />~'~ <br />" <br /> <br />GraDhs 5 & 6 are deSigned to indicate the effect of not including <br />storage unit evaporation in the inflow to Lake Mead when computing "Basic <br />F41l1". These graphs are similar to Graphs 3 and 4 except that Glen Canyon <br />evaporation has been deducted from the inflow to Lake Mead. By overlaying <br />Graph 3 on Graph 5 and Graph 4 on Graph 6 the effect of depleting the <br />computed inflow to Lake Mead by the amount of Glen Canyon evaporation <br />is indicated. It is obvious that the effect is much greater when Hoover is <br />operated at the lower efficiency. These graphs illustrate item 3 on page 12 <br />of Mr. Goslin's report. <br /> <br />-16- <br />