Exporting Data to a Text File When you are in Model mode of Graphic Groundwater, you can export the values in an overlay by executing the Export Overlay Coordinates or Export Overlay commands under the File menu. Exporting overlay coordinates will create a text file with a single line for each cell which gives the (x,y) coordinate of the center point of the cell and the (z) value of the cell. The values are separated by commas. The (x,y) coordinates are based on an origin either in the upper left corner or lower left corner of the grid as specified in the Save File window. Exporting an overlay will create a text file containing just the (z) value of the cell. The values are in a tab delimited format (a rectangular array) that can be directly imported into most spread sheet or word processing software. The first line of the file contains the number of columns in the array; the second line in the file contains the number of rows. Graphic Groundwater can export data on the drain, general head boundary, river, and well cell stresses. The file format for each stress is similar to, but not identical to a MODPATH stress input file. The block of data on a cell stress is preceded by the stress period. The following lines include the layer, row, and column of each stress followed by one or more property values, then the discharge face (IFACE in MODPATH; see Pollock , 1989). MODPATH expects each stress parameter to be in a field 10 characters wide. The values exported by Graphic Groundwater are tab delimited and would need to be edited in a word processor to force the proper spacing and to add the appropriate header files. Finally, Graphic Groundwater can export a file containing a result of the model (such as hydraulic head or a cell by cell budget) and cumulative time for a specific cell. Each line contains the head and the cumulative time at the end of a time step. The data are tab delimited. The exported file, which most spreadsheet and graphics programs can read, helps you create graphs of the result versus time.