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The following people were interviewed in a series of meetings to discuss the current data <br />centered modeling process. Preliminary workflow diagrams summarizing the process and <br />software applications used were prepared and reviewed with the State to refine the current <br />process. <br />^ Ray Bennett -Colorado Division of Water Resources <br />^ Brian Ahrens -Colorado Division of Water Resources <br />^ Erin Wilson -Leonard Rice Consulting Water Engineers, Inc. <br />^ Bruce Rindahl -Leonard Rice Consulting Water Engineers, Inc. <br />^ Steve Malers -Riverside Technology, Inc <br />^ Willem Schreuder - Principia Mathematica, Inc. <br />Documentation for the software applications that are used to facilitate the data centered modeling <br />process was also obtained and reviewed. Table 1 provides a listing of the available <br />documentation for groundwater related packages used in the current process. <br />2.0 Current Data Centered Process Description <br />A data centered modeling process has been implemented for the RGDSS for both surface water <br />and groundwater elements, and for the CRDSS for surface water. The current process <br />implemented for groundwater aspects has limitations that led to this evaluation of potential <br />enhancements to existing approaches. This process uses a graphical user interface package, <br />currently the Department of Defense Groundwater Modeling System Version 31 (GMS), for <br />basic model framework management, and a series of programs referred to as data management <br />interfaces or DMIs to process data from HydroBase or the GIS repository to develop model <br />control files. Model output files are post-processed in additional processes that reformat or <br />summarize these output files for analysis. This section describes the workflow for the data <br />centered modeling process and the function of individual programs (DMIs) used in the existing <br />process by the State on the RGDSS. Section 2.1 outlines the overall workflow utilized in the <br />current approach. Section 2.2 identifies existing approaches to developing the conceptual model. <br />Section 2.3 summarizes development of model datasets and the functions of programs used in <br />this process. Section 2.4 describes the model execution and calibration process, while Section <br />2.5 describes post-processing of model outputs. <br />2.1 Workflow Description <br />The data centered modeling process currently incorporates many interrelated steps, using a <br />number of individual software packages (DMIs). These individual packages typically utilize <br />command files to define input and output files and control parameters. These packages have <br />been written using scripting languages, such as Perl or Avenue, or in compiled languages <br />including Visual Basic and FORTRAN. For the purposes of this TM the non-commercial <br />