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The model grid will be developed in GMS, and internal tools will then be used to transform the <br />conceptual model elements onto this grid. It is anticipated that the numerical grid <br />configuration will not change frequently. The grid will be exported as a drawing interchange <br />file (.dxf) for use in program StateDGI, which currently meets the requirements of the SPDSS <br />groundwater component. This program, which provides input data to program StatePP, maps <br />irrigated parcels, native recharge areas, and structures to the model grid to allow processing of <br />flux terms from program StateCU. This program also associates wells with structure IDs. The <br />current version of program StateDGI also allocates well production intervals to model layers, <br />however; this function will not be necessary in the enhanced process, since MODFLOW-2000 is <br />able to do this allocation internally using the multi-node well package, when the groundwater <br />models require more than one layer. StateDGI also uses information from nearby wells to <br />estimate the probable screen interval, in cases where well completion information is not <br />available. Program AGG pre-processes files generated by program StateCU to a form useable in <br />StatePP for generation of recharge, evapotranspiration, well and drain package files for the <br />groundwater model. Program AGG also reports information for quality control checks for <br />input files. No significant modifications to program AGG are anticipated, however, this <br />program will be incorporated into StatePP, rather than remaining a separate process. Program <br />StatePP has recently been modified by the State to generate MODFLOW-2000 format package <br />files for the new drain and evapotranspiration packages. <br />The process for generation of stream flow routing package files will require significant <br />modification of the approach used for the RGDSS because the MODFLOW SFR1 stream <br />package files are significantly different from the file format used for the RGDSS. The current <br />process used in the RGDSS is not directly applicable to the SPDSS, though many of the <br />underlying computer codes, concepts and algorithms will be adopted. Anew DMI will be <br />required, since GMS versions 5.1 and 6.0 do not support the Stream Flow Routing package. The <br />new stream handling process will need to merge information on channel cross-sections, <br />streambed properties and algorithm selection from the Modeling GIS Repository, with the grid <br />information from GMS and flow information from program TSTooI to generate the actual <br />stream flow routing package files. <br />GMS will be utilized to prepare many of the remaining MODFLOW-2000 package files that are <br />needed for conducting a simulation. These capabilities may be supplemented through use of <br />other packages, such as PEST for generation of aquifer properties. Workflow through the <br />process will be managed using a version of the program ModGUI which is recommended for <br />enhancement under this task. This package currently provides a framework for preparing <br />command files with a simple editor, and examining output files specific to individual packages <br />or other components such as cell by cell fluxes, water budgets, etc. Modifications to program <br />ModGUI will allow it to maintain its current modular structure and manage new and modified <br />DMIs. Program ModGUI will also be used to assist in generation of reports and graphical <br />displays. <br />2.0 Process Enhancements Scope of Work <br />The scope of modifications to selected processes is provided in the following sections. Tasks for <br />this scope of work are defined along with associated deliverables. This scope of work includes <br />a series of working meetings with State personnel and other contractor teams that will be <br />contributing to the enhanced process. Based on discussions with the State, any modifications to <br />