In addition to the statistical results that are output to the Tables Tab, HEC-EFM also generates a project summary report and files of the computations it performs while generating the statistical results. To view the project summary report, use the "File – Report" menu option.
By default, computation files are not generated automatically by the software in order to minimize computation time. This output option is selected individually for each relationship. To test this feature, go to the Relationships Tab, select the Big bass winter habitat relationship, and check the box next to Write computation arrays in the Options frame (Figure 41).
Figure 41. Checking the Write computation arrays box.
Output formats are selected via the “Edit – Select Arrays Format” menu option. Choices are provided for XML, DSS, or Both. Select Both and click the Recalculate button (Figure 42). A folder named "Arrays" will be created in the directory of the HEC-EFM project file to store the output.
Figure 42. Output choices via the Select Arrays Format menu options.
The term XML stands for Extensible Markup Language. XML is a widely used format for archiving and viewing data. Separate XML files are generated for each combination of flow regime and relationship. Each of these files contains the computational steps, statistical results, and frequency curves produced by HEC-EFM. The XML arrays are organized such that the final results are located at the top of the file followed by each computational step in reverse order (Figure 43). Using the "File – View Array File…" menu option, select "Gaged_Big bass winter habitat.xml" and click Open.
Figure 43. Excerpt from the XML output file for Big bass winter habitat and the Gaged flow regime.
The highlighted value is the statistical result. The table also contains seasonal results for each historical water year in the period of record. This type of information provides more details about the relationships and flow regimes than the statistical results reported on the Tables Tab and can be very valuable to HEC-EFM applications.
These same data are stored in a file named "arrays.dss" and are archived according to flow regime and relationship names. The "arrays.dss" file can be accessed using HEC-EFM Plotter or HEC-DSSVue, which are available via the HEC website (http://www.hec.usace.army.mil). Figure 44 shows the catalog of data output to DSS for the Big bass winter habitat relationship, time series calculations done to compute seasonal results for the Natural flow regime, and frequency curves of seasonal results for Natural and Gaged flow regimes with the 50% exceedance values selected as the statistical results.
Figure 44. Catalog of HEC-EFM data output to DSS for the Big bass winter habitat relationship. Seasonal results for the Natural flow regime as well as a frequency curve of seasonal results for Natural and Gaged flow regimes are shown.