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<br />C) <br />C) <br />N <br />l-v <br />C) <br />00 <br /> <br /> <br />176 <br /> <br />In addition, the initial storage of water and total dissolved <br /> <br />solids (or the total dissolved solids concentration) must be specified <br /> <br />at the beginning of each simulation run. These initial conditions are <br /> <br />input as control variables although transient operation of the model is <br /> <br />performed to insure that their values in no way affect the output <br /> <br />of the model. <br /> <br />The value or range of values assigned to each of these control <br /> <br />variables is discussed in the following sections and displayed in <br /> <br />Table 5.11. <br /> <br />5.5.2.1 Lake Powell Operating Parameters <br /> <br />The minimum possible storage in Lake Powell is constrained <br /> <br />to the volume of dead or inactive storage; as given in Table 4.1 and <br /> <br />again in Table 5.11. The maximum storage ,allowed in Lake Powell has <br /> <br />been varied between simulation runs as explained in the context of <br /> <br />management investigations in Chapter 7. The upper value is limited <br /> <br />by the, design maximum storage, as indicated in the table. <br /> <br />The target discharge for Lake Powell is set equal to 8.23 <br /> <br /> <br />MAF/yr (10.15 km3/yr). This value is equal to the target discharge <br /> <br />established by the 1970 Operating Criteria for Lake Powell (see <br /> <br />Section 1.2.3). The Operating Criteria actually state that 8.25 <br /> <br />MAF pass the 1922 Compact Point at Lee Ferry, Arizona each year. Since <br /> <br />an av~rage of 0.02 MAF enter the main river channel between Glen <br /> <br />Canyon Dam and Lee Ferry, Arizona, the required discharge from Lake <br /> <br />Powell is only 8.23 MAF/yr. <br />