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• The interface should be able to display two- and three-dimensional data for model <br />structure and results. <br />• The interface should also provide the ability to intemperate with model outputs from the <br />parallel USGS Denver Basin modeling efforts. <br />The use of a conceptual model approach allows easy modification of the numerical model for <br />changes in domain or the model grid. This conceptual model approach also allows use of GIS <br />capabilities, where spatial information is stored outside of the modeling system and available for <br />use in other aspects of the DSS. <br />3.2 Candidate Packages <br />A number of commercial interface packages are available for both MODFLOW and other <br />numerical groundwater models. The major commercial packages include: <br />• Department of Defense Groundwater Modeling System (GMS) by Brigham Young <br />University <br />• Groundwater Vistas by Environmental Simulations, Inc <br />• Argus ONE (with USGS MODFLOW-GUI) by Argus Interware, Inc <br />• Visual MODFLOW by Waterloo Hydrogeologic, Inc <br />• Processing MODFLOW by Wen-Hsing Chiang <br />The available commercial interface systems all have limitations, so continuing the custom <br />processing that the State has implemented for the RGDSS will remain necessary. All of the <br />candidate packages rely heavily on ArcGIS for at least some of their functions, thus ArcGIS will <br />remain an integral part of the process. None of these interface packages will be able to use data <br />sources or GIS coverages directly in their current form and will require either modifications to <br />these sources, or intermediate processing to a suitable form. The evaluation of commercial <br />interface capabilities is a preliminary screening that will be refined during Tasks 50.2 and 50.3, <br />where specific requirements will be defined for the data centered modeling process, and an <br />implementation plan developed. The selected GUIs will be screened against requirements to be <br />developed in Task 50.2 in order to select a single package for the implementation stage. Table 2 <br />provides a summary of capabilities of the three selected packages for the preliminary screening <br />criteria. <br />The two packages that were eliminated from further consideration, Visual MODFLOW and <br />Processing MODFLOW, implement a model grid oriented approach rather than a conceptual <br />model approach, where the interface is intended to facilitate data management of actual <br />numerical model information in a form very close to that used to actually run the models. In <br />addition, these two interface packages are intended to work principally with their internal <br />11 <br />