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<br />. <br /> <br />. <br /> <br />3 <br /> <br />-~ <br />'.-), <br /> <br />be understood that these curves are only approximate and only give <br />an Indication as to the probabilities Involved. <br /> <br />~ <br />'-/1 <br />.) Minimum Release to Lomer Basin <br />""" <br /> <br />All recent analyses of upper basin yield were made under the <br />assumption of an operating criteria specified minimum annual <br />release to the lower basin of 6.25 MAF at Lee Ferry or 6ZS MAF <br />release at Glen Canyon Dam. Current analyses Include those made <br />with mlt'iimum releases set at 7.5 MAF annually. The difference <br />between releases can, of course, be translated directly into <br />increased yield In the upper basin. Mass balance analyses similar to <br />those de~,Crlhel1ln theprE"'laus sectlpn ~etl" made using beth 20.197 <br />MAF of s~orage ("emptylOat top of inactive poolS) and 23.141MAF <br />(lOemptylOat bottom of Inactive pools). The firm yields of the basin (no <br />Shortages) were calculated at 6.28 MAP and 8.40 MAP respectively. <br /> <br />Figures 2 and 3 show the relationships between yield, <br />:shortage' and probabilitie:s. A:s indicated in the earlier example, . <br />these should be considered approximate relationships. <br /> <br />Summary of Results <br /> <br />The following table shows a summary of the results of these <br />analyses. <br /> <br />Studv <br /> <br />Hvdrology <br /> <br />storage <br /> <br />Min. Release Firm Yield <br /> <br />1967 Study Virgin Flow ' 26.232 <br /> <br />8.25 <br /> <br />5A5 <br /> <br />Current <br />Studies <br />l1einf:~in <br />Min. <br />Pools CRSS Nat'l <br /> <br />CRSS Nat'l <br /> <br />20.197 <br />20.197 <br /> <br />8.23 <br /> <br />5.55 <br />6.28 <br /> <br />7.5 <br /> <br />Use <br />Min. <br />Pools CRSS Nat'l <br /> <br />23.141 <br /> <br />8.23 <br /> <br />5.67 <br />6.40 <br /> <br />CRSS Nat'l <br /> <br />23.141 <br /> <br />7.5 <br />