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The fourth area recommended for revision and enhancement is associated with the calibration <br />process. The current calibration approach uses the concept of hydraulic parameter zonation, <br />with modifications done manually to smooth the transition between defined zones. The process <br />implemented in Phase 3 will remain flexible and consider the use of streamlining techniques for <br />calibration that incorporate tools such as PEST or internal MODFLOW-2000 tools. PEST is a <br />model-independent parameter estimation software package that is available in the public <br />domain. Incorporation of PEST or internal MODFLOW-2000 tools allows automation of <br />sensitivity analysis and can assist in the calibration process. PEST includes advanced tools, <br />such as use of pilot points with regularization of parameter fields. A potential application of <br />this method would be to determine hydraulic conductivity in the model. Points where <br />hydraulic conductivity data are available would be honored in the resulting data set, but grid <br />locations away from these specified "pilot points" would take other values necessary to match <br />modeled and observed values. The use of explicit zones may be more appropriate for <br />parameters such as specific yield, which do not have many field determinations. The program <br />PEST is recommended for addition to the set of SPDSS modeling tools. PEST and MODFLOW- <br />2000 parameterization tools are included within the selected modeling GUI, GMS. <br />2.2 Model Output Process Enhancements <br />Table 2 defines processes that convert model output to formats useful for post-processing, or <br />prepare graphical and tabular summaries of model results. The principal enhancements needed <br />for post-processing and visualization of model results relate to documentation and automation <br />of these processes. Table 2 defines a series of post-processing packages that are used to convert <br />model results into useable reports or to modify files for further processing in other packages. <br />The workflow management GUI, program ModGUI, is recommended to be modified to <br />incorporate these general post-processing routines, including generation of log files <br />documenting the process. <br />A suite of programs, including the selected modeling GUI, PM-DIAMOND, and ArcGIS will be <br />utilized for most of the analysis and visualization graphical analyses. Modifications to program <br />ModGUI will be required to manage the post-processing elements. Apost-processing control <br />module is recommended that would allow selection of the types of output that would be <br />generated. This would include generation of potentiometric surface maps, time series plots of <br />water levels or flows and calibration statistics. The workflow package (ModGUI) modifications <br />will initially focus on those elements required for model calibration and evaluation of <br />alternatives. <br />3.0 Modeling Graphical User Interface Selection <br />The Task 50.1 TM outlined the capabilities of several available modeling GUIs and identified <br />three candidate programs for selection as the primary modeling GUI for the SPDSS. These three <br />packages include the Department of Defense Groundwater Modeling System (GMS), <br />ArgusONE with the USGS MODFLOW-GUI add-on package (ArgusOne), and Groundwater <br />Vistas (Vistas). Each of these candidate GUIs potentially meet the basic selection criteria for <br />inclusion in the data centered modeling process. A basic description of each of these packages <br />was provided in the Task 50.1 TM. Table 3 provides a summary of functions that will be <br />implemented in the selected GUI, and comments about the suitability of each of the packages. <br />The areas considered for each package include the capabilities of the programs to handle the <br />