Results for a frequency analysis are generated by computing it. When computing a frequency analysis, each frequency ordinate gets computed in succession and a Frequency Curve Plot and Frequency Curve Table are generated at the end of the compute. 

Selecting a Current Frequency Analysis

There are two ways to select the current frequency analysis. Both methods set the analysis so that it can be computed and results can be accessed from the Watershed Explorer Results tab.

The first way to select the current frequency analysis is from the toolbar. The compute selection box shows all of the compute components in the project. Each frequency analysis in the selection box includes the prefix Frequency followed by the name of the analysis. Click on the toolbar selection box and choose a frequency analysis to become the current analysis.

The second way to select the current frequency analysis is from the Watershed Explorer, on the Compute tab. Select the frequency analysis you wish to become the current analysis by clicking on it in the Watershed Explorer. The frequency analyses are listed alphabetically in the Frequency Analyses folder. 

Computing a Frequency Analysis

There are three ways to compute the currently selected frequency analysis. All methods automatically perform parameter checking, and if no errors are generated, proceed to the actual computing of frequency analysis results.

The first way to compute a frequency analysis is from the Compute menu. Click on the Compute menu and then select the Compute Frequency command. The name of the current frequency analysis is shown in brackets as part of the menu command. If the command is not available, it is because there is no current frequency analysis; you must first select an analysis. A window will automatically open that shows the progress of the compute. You will need to manually close the window when the compute is done, whether it failed or was successful. If you wish to force all components to be recomputed instead of just those with data changes, hold the control key while selecting the menu command.

The second way to compute a frequency analysis is from the Watershed Explorer, on the Compute tab. Select the frequency analysis you wish to compute by clicking on it in the Watershed Explorer with the right mouse button. A context menu is displayed that contains several choices including compute. Click the Compute command. The progress window will automatically open. If you wish to force all components to be recomputed instead of just those with data changes, hold the control key while selecting the right mouse menu command.

The third way to compute a frequency analysis is from the toolbar. The compute button is enabled whenever there is a current analysis that can be computed. If the button is not available or shows a different type of compute, you must first select a frequency analysis. Press the button to compute the current frequency analysis. The progress window will automatically open. If you wish to force all components to be recomputed instead of just those with data changes, hold the control key while selecting the toolbar button.

Computing Multiple Frequency Analyses

Multiple frequency analyses can be computed in rapid succession. Each analysis included for simulation is internally managed the same as if it were computed in isolation. The steps automatically performed for the user begin with selecting the frequency analysis, checking parameters for the analysis, and finally computing the simulation. This sequence is repeated for each frequency analysis in the selected set. Appropriate feedback is provided through a progress bar.

The multiple frequency analyses must exist before they can be selected for a multiple compute. Select the Multiple Compute command on the Compute menu. A manager is used to select frequency analyses (see figure below). Make selections in the list and then press the Compute button to begin computing the selected analyses. A separate progress bar will be displayed for each frequency analysis as it is computed. The progress bar may disappear automatically at the conclusion of a frequency analysis depending on the configurations in the Program Settings. If errors are encountered while computing an analysis, the progress bar will always remain visible after all selected analyses have finished computing regardless of any other settings.

Multiple Compute - Frequency Analysis