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fence diagrams on any orientation. GMS has extensive 2-D and 3-D visualization routines to <br />display both model structure and model results, including animation capabilities to assist in <br />public presentations. Results can be exchanged with ArcGIS to produce report ready figures. <br />3.2.2 Groundwater Vistas <br />Groundwater Vistas (Vistas) is a commercial product developed and supported by <br />Environmental Simulations, Inc, that has also been available for a number of years and is <br />currently at version 4. Vistas is able to export MODFLOW format data files for MODFLOW- <br />88, MODFLOW-96 and MODFLOW-2000, in addition to other finite difference based models. <br />Vistas takes a different and more limited approach for developing a conceptual model based <br />simulation than GMS. Vistas incorporates grid independent point, line and circle boundary <br />conditions that can represent wells, constant head or constant flux boundaries, or river <br />conditions. The stream and stream flow routing packages are not supported with these internal <br />grid-independent boundary conditions; however, these types of boundary conditions are <br />available when importing shape files. Vistas has limited interpolation capabilities for mapping <br />of random data onto the model grid, and has fair two-dimensional visualization capabilities. <br />Vistas implements full conceptual model development using shape files from ArcGIS, allowing <br />the grid independent model parameters and boundary conditions that are maintained in ArcGIS <br />to be imported to Vistas to generate a numerical model. All model characteristics, except for the <br />model grid, can be created and maintained in ArcGIS and then imported as shape files. If the <br />parameter naming conventions are observed in the shape files, the importing of each <br />characteristic requires minimal intervention. Individual spatial arrays for each model layer must <br />be imported manually and then interpolated to the grid to create the numerical model. Vistas can <br />create MODFLOW files that can then be run in any version of MODFLOW that uses the same <br />files formats, thus custom State versions of MODFLOW can be used. The current internal <br />version of MODFLOW-2000 used within Vistas is 1.12. Vistas supports the full capabilities of <br />the streamflow routing (SFR1), multi-node well (1VINW) and the lake (LAK3) packages within <br />its GUI. It does not support the reservoir (RES 1), the enhanced evapotranspiration (ETS 1) or the <br />drain (DRT1) packages. Vistas also has linkages to optimization packages such as PEST and <br />UCODE, in additional to its own internal sensitivity analysis and calibration tools. Vistas has <br />tools for comparing model results to both steady state and transient calibration targets to assist in <br />the calibration process. Vistas can generate two-dimensional graphics of both model structure <br />and results, including cross-sections that are aligned with rows or columns. An external package <br />is included to do basic three-dimensional visualizations. Vistas can also export results, including <br />transient data, to ArcGIS for preparation of final report quality graphics. <br />3.2.3 Argus ONE (with USGS MODFLOW-GUI) <br />This package was selected for evaluation primarily because the USGS is utilizing this GUI for <br />their development of the Denver Basin model. The combination of Argus ONE with the USGS <br />developed add-on package MODFLOW-GUI (currently version 4.20.4.0) is a unique <br />combination of a commercial interface package, combined with a public domain, open source <br />addition that expands the basic capabilities to specifically handle MODFLOW-2000 and related <br />14 <br />