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years hit the maximum efficiency limit, therefore, to a lesser degree average years are also a <br />potential problem. <br />Another potential issue with aggregate structures occurs due to estimating efficiencies based on <br />overall basin averages. The calculated efficiencies for most of the structures in Water District 54 <br />are at the 60 percent maximum. However, the overall basin monthly efficiencies used to <br />estimate the "estimated" aggregates diversions range from 19 to 48 percent during the irrigation <br />season. Therefore, it may be more appropriate to estimate aggregate diversions using <br />efficiencies determined by water district. <br />Figure 6 shows measured Previous CRDSS, and Enhanced analysis diversions from 1976 <br />through 1997 for the Slater Creek Aggregate Diversion. As shown, in many years, late season <br />simulated diversions are zero when there are still "estimated" diversions. The zeros estimated by <br />the Enhanced model are probably more representative of what occurred even though they do not <br />calibrate as was well as the Previous CRDSS model. Figure 7 shows a scatter plot for the Slater <br />Creek Aggregate Diversion. <br />Figure 6 <br />Slater Creek Aggregate Diversion - 54_ADY022 <br />Previous CRDSS Historic Simulation and Enhanced Simulation <br />3500 <br />3000 <br />~; 2500 <br />N <br />N <br />v 2000 <br />R <br />c <br />.~ <br />~ 1500 <br />L <br />~_ <br />~ 1000 <br />500 <br />1976 1978 <br />1980 1982 1984 1986 1988 1990 1992 1994 <br />1996 <br />Gaged Previous CRDSS - - -Enhanced <br />VariableEff Taskl-5 9 of 17 November 5, 2001 <br />