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the program StateDGI files. Flows from all wells are accumulated and used to generate the well <br />package file for MODFLOW. <br />Drain files are generated to represent flowing wells, springs and agricultural drains. Flowing <br />wells are specified as drains with parameters based on data input by the user. Actual drains and <br />springs are specified by location and elevation of discharge. Program StatePP checks these <br />against ground surface elevations and adjusts as necessary prior to generating the MODFLOW <br />drain package file. <br />2.3.4 Stream Package Processing <br />Generation of MODFLOW stream package files is accomplished using a series of Perl scripts <br />including program mkstr, program mkq, program build and relevant capabilities of program <br />ModEX. The scripts in programs mkstr, mkq and build are specific to the RGDSS, while <br />program ModEX is more generalized. Program ModEX provides other functionality, however, <br />only the stream processing capabilities are addressed in this section. These packages are run <br />individually, and some may be accessed using a GUI to edit control files and launch the <br />programs. Limited documentation is available that describes the use of these packages. <br />The initial step consists of assembling individual stream segments into a combined network <br />using program mkstr. This program uses digital elevation model (DEM) files and digital line <br />graph (DLG) files containing annotation identifying the stream name associated with features. <br />The DLG files must be processed with program shape2ste and then post-processed with the <br />UNIX system utility program rgrep to extract lines associated with individual streams. Some <br />manual editing of the resulting file is required during the initial configuration to remove <br />segments outside the model area and to identify diversions. The package uses the DEM <br />information to assign elevations to each point along the stream or diversion and diagnostic <br />reports are generated for problem stream reaches. <br />The next stage in the process requires the program mkq to generate a single flow file that <br />associates flows and diversions generated in program TSTooI from HydroBase data. Return <br />flow data from program ModFate are also incorporated at this stage. The determination of return <br />flows is an iterative process, where information from an earlier model simulation is used to <br />calculate the flow. The process is repeated until the change in return flow is acceptably low. <br />The build program assembles and formats files for input to the program ModEX stream module. <br />Program ModEX assigns stream parameters to individual model cells and interpolates elevations. <br />Diversion and return flows and the locations of gages are included in the files. Stream gage <br />locations are used in program ModEX to generate control files for the USGS HYDMOD package <br />to extract model calculated flows for comparison with actual flow data. <br />2.3.5 Workflow Management <br />Management of workflow for pre- and post-processing is accomplished using the graphical user <br />interface program ModGUI. This GUI integrates access and management of files for all of the <br />major pre- and post-processing packages except for program StateDGI and some of the stream <br />