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<br />f'! ~.\?~ 1_ 8 <br /> <br />tion of output from the two phases of this model <br />will still allow determination of the reduction in <br />suppression for subsequent years. <br /> <br />The two significant parameters which cause <br />decay of the added heat are flow from the outlet <br />(which is still warmer than normal) and the revised <br />heat of vaporization due to extra evaporation <br />(which is now a negative quantity). These are <br />computed with equations of the same form as <br />previously described. The negative suppression is <br />computed as a function of normal surface <br />temperature plus residual temperature inCTease for <br />each month of the year. <br /> <br />One additional capability of Program 6 is that <br />the draw down can be varied by adding a constant <br />(NOON). This will allow analysis of suppression <br />'during periods of drought. and also above normal <br />storage. <br /> <br />Program 7: <br />Multiple Regreulon Model <br /> <br />Temperature profile data taken over a period <br />of at least three months are necessary for input to <br />the detailed suppression model previously described <br />(Programs I to 6).- Such data were not available <br />except for that measured by the USGS and USBR <br />on Flaming Gorge and Lake Powell, and from <br />previous studies at USU of Bear Lake and Hyrum <br />Reservoir. In order to provide enough additional <br /> <br />data for a model which is representative of Utah <br />impoundments, temperature profiles were mea. <br />sured at several additional reservoirs during the <br />summer of 1974. These were selected not on the <br />basis of maximum probable suppression, but <br />rather as a representative sample including a large <br />variation in depths. elevations, and flow/storage <br />ratios. <br /> <br />Adequate data were assembled from all of <br />these sources to perfonn a muJtiple regression <br />analysis on output from the detailed model for 10 <br />reservoirs. A complete Iisling of these temperature <br />profile data is included in Appendix 1. . <br /> <br />The stepwise multiple regression program <br />used included the MOCR, and SMRR portion of <br />the STATPAC package on the USU Burroughs <br />computer. The model produced by this analysis is <br />discussed in the Results and Conclusions section. <br /> <br />Program 8, <br />Application of Regression Model <br /> <br />The final program listed in the work flow chart <br />is a modification of the model application program <br />used in Volume I. This program applies the <br />regression function developed by Program 7to each <br />of the man-made reservoirs in the inventory for <br />which maximum depth is known. The output from <br />this program will also be discussed later. <br /> <br />31 <br />