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<br />C:) <br />.:.:) <br />N <br />1-' <br />'"'"'" <br />o <br /> <br /> <br />178 <br /> <br />The initial storage in Lake Powell is set equal to the maxi- <br /> <br />mum storage. The initial storage is arbitrary in the sense that <br /> <br />adequate transient operation is performed to allow system response to <br /> <br />become independent of initial conditions (see Section 6.1). For the <br /> <br />same reason, the initial total dissolved solids concentration of Lake <br /> <br />Powell water is arbitrary, and has been set to the average 1968 value. <br /> <br />5.5.2.2 Lake Mead Operating Parameters <br /> <br />The maximum and minimum storages of Lake Mead are set equal <br /> <br />to the design values given in Table 4.1. This choice of values is <br /> <br />discussed further in Section 7.2.2. <br /> <br />The target discharge from Lake Mead is set equal to the <br /> <br />annual demand to be satisfied below Lake Mead. The Operating Criteria <br /> <br />specify that under nO,rma1 conditions, following the completion of the <br /> <br />Central Arizona Project, releases and withdrawals from Lake Mead will <br /> <br />'be sufficient to satisfy a consumptive use of 7.5 MAF/yr in the Lower <br /> <br />Basin and the Mexican treaty obligation of 1.5 MAF/yr. <br /> <br />While the Lower Basin states are allowed to consume more than <br /> <br />their legal allotment when surplus water exists, they will eventually <br /> <br /> <br />be constrained to the consumptive use of only 7.5 MAF/yr (9.2 km3/yr). <br /> <br />In the future, therefore, the Lower Basin depletions below Lake Mead <br /> <br />and the c~mmitment to Mexico of 1.5 MAF/yr will require a total release <br /> <br />from Lake Mead of 7.0 MAF/yr (8.6 km3/yr) (Ribbens and Wilson, 1973; <br /> <br />Tables IX and X). <br />