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software. Argus ONE is an open toolkit that provides an application programming interface to <br />allow developers to add extension packages and use the GIS and model building capabilities <br />within Argus ONE. The USGS public domain add-on package to Argus ONE (MODFLOW- <br />GUI) is more cumbersome to use than the integrated commercial packages. For example, stream <br />flow routing package information requires redundant definition of information on several layers. <br />Like GMS, the Argus ONE/MODFLOW-GUI environment is also focused on grid-independent <br />definition of conceptual model elements. The USGS add-on package MODFLOW-GUI provides <br />a means to migrate this conceptual model framework into MODFLOW-2000 files. This package <br />can handle virtually all of the package types that are likely to be used with the SPDSS. The <br />internal GIS capabilities of Argus ONE include information layers that can be used to represent <br />point features, such as wells; line features, such as streams; and areal features, such as parameter <br />zones for recharge. The USGS interface defines numerous GIS layers based on general model <br />information that is provided by the user, including definitions of variables that are associated <br />with each spatial entity that is present on a layer. As noted above, if the stream flow routing <br />package is specified, a series of layers are created for entry of various data types. Stream <br />segments must be defined on each of these layers, and the appropriate data attached to these <br />segments. With care, this can be done within ArcGIS and directly imported to Argus ONE. <br />Manual editing may be required to obtain correct linkages of stream segments, however, the <br />USGS package provides tools to ease this effort. <br />This package does not provide integrated links to automated calibration tools such as UCODE or <br />PEST, so use of these packages would require external manual setup and post-processing. The <br />USGS program GW-CHART may be used to assess overall calibration statistics; however, Argus <br />ONE lacks the tools available in GMS and Vistas for comparison of target with simulated values. <br />Visualization tools within the Argus ONE/MODFLOW-GUI are adequate for working graphics, <br />however, the quality is limited for final report products. Exporting of information to shape files <br />for processing in ArcGIS is possible. Argus ONE/ MODFLOW-GUI has exhibited some <br />stability problems during testing, with occasional crashes and subsequent loss of data. <br />Summary and Conclusions <br />The existing data centered modeling process utilized by the State for the RGDSS groundwater <br />model was examined and summarized. This process includes a workflow that originates with <br />geographic data in the State GIS repository, and other data residing in HydroBase, through a <br />series of processing steps that lead to running a MODFLOW simulation. Another series of <br />processes are used to summarize model results and prepare figures to assist the model users. <br />This data centered modeling process currently involves multiple independent steps and more <br />than 20 individual software packages. This process is thoroughly documented and includes <br />procedures that allow quality control checking to occur. <br />15 <br />