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<br />,4...... <br />"",r <br /> <br />N <br />"..... <br />tQ <br />o <br /> <br />158 <br /> <br />modeL <br /> <br />The difference between measured and modeled outflow may be due <br /> <br />to a less than average contribution of salts from side inflows or by <br /> <br />a substantially smaller contribution from the change in salt stored <br /> <br />in Lake Mead. <br /> <br />Model validation over the period 1941 to 1962 confirms the values <br /> <br />of average side inflows of water chosen for the model and indicates <br /> <br />that an adjustment to side inflows of salt was required. The cumulative <br /> <br />effects of bank storage upon the water balance of Lake Mead are seen <br /> <br />to be negligible. The mixing model for determining dissolved solids <br /> <br />discharges from Lake Mead gives results agreeing with actual discharge <br /> <br />within 6%. Validation over the period 1963 to 1968 suggests no reason <br /> <br />to alter the model construction or operation. The mass flows of <br /> <br />water and dissolved salts below Lake Powell for the period 1963-1968 <br /> <br />are significantly effected by the initial filling of Lake Powell. <br /> <br />These effects are considered transient in nature and of little con- <br /> <br />sequence in modeling steady-state conditions in the basin. <br /> <br />5.4 Summary of Simulation Variables, Inputs and Outputs <br /> <br />This section summarizes the information requirements for a <br /> <br />simulation run and the output obtained. <br /> <br />To facilitate the discussion of results in Chapters 6 and 7, the <br /> <br />definitions introduced in Section 1.3.1 are repeated here. <br /> <br />(1) !lode1 parameters - parameters, such as the average January <br /> <br />streamflow for tributary 3, which are constants for all <br /> <br />simulations and determined from calibration data. <br />