An outfall is the point where a waste stream is discharged into a body of water. It can also be the outlet of a river, drain, or sewer that flows to the sea, lake, or ocean. In GeoSTORM software, the Terminal Outfall Table Edit command allows the user to view and edit all the parameters of the terminal outfalls in one editable data grid. The user can also view the corresponding output results from this data grid.
Follow the steps below to use the Terminal Outfall Table Edit command:
- From the Input ribbon menu, click the Terminal Outfalls dropdown menu and select the Terminal Outfall Table Edit command.

- The Terminal Outfall Table Edit dialog box will be displayed.

The following sections describe how to use the Terminal Outfall Table Edit command and interact with the above dialog box.
Selecting Storm Results
In the Select Storm Results section, the Storm result to display dropdown combo box allows the user to select the storm frequency whose result is to be displayed.
Note that the Select Storm Results section is only available when either the Modified Rational, Rational Method, or DeKalb Rational Method is selected as the hydrology analysis engine in the Scenario Manager dialog box. Otherwise, this section is unavailable. Refer to this article in our knowledge base to learn more about hydrology analysis engines supported by GeoSTORM.
Terminal Outfall Parameters
The following panels are available in the Terminal Outfall Parameters section:
- Outfall Data
- Results Data
Outfall Data
This panel contains editable data grid columns listing terminal outfall parameters present in the current scenario.
The following terminal outfall data parameters are provided in the data grid column entries:
- Terminal Outfall ID
This editable column lists all terminal outfall IDs contained in the current scenario. Note that this editable column will also be available in the Results Data panel.
- Outfall Type
This column having a dropdown combo box allows the user to define the boundary condition for the terminal outfall defined. The following outfall types are available:
- Critical Depth
- Fixed WSEL
- Normal Depth
- Tidal Boundary
- Time Series

- Invert Elevation
This editable column lists the terminal outfall invert elevations. The user can click the […] button to manually select the terminal outfall invert elevation from the Map View.
- Downstream Link Slope
This read-only column lists the slope for connecting links that contain one of the following elements:
- Pipes
- Routing reach
- Roadway segment
- Roadway crossing (i.e, Culvert)
Results Data
The data grid columns in this panel list corresponding output results for terminal outfalls present in the current scenario.
- Peak Flow Rate
This read-only column lists the peak flow rate at the corresponding terminal outfall during the storm event.
- Stored Water Volume
This read-only column lists the computed stored water volume that occurred at the corresponding terminal outfall during the storm event.
Sorting the Terminal Outfall Table
The data in the Terminal Outfall Parameters table can be sorted by multiple columns. The user can sort the data by holding down the [Shift] key while clicking the Up or Down arrows in the column headers. This allows for multi-column sorting without losing the previous sort. The sorting order is determined by the sequence in which the column headers are selected.
Follow the steps below to sort the data by using multiple columns:
- Select the header of the first column and click the Up or Down arrow to sort the data in ascending or descending order.
- Hold down the [Shift] key, then select the header of the second column and click the Up or Down arrow to sort the second column.
- Repeat step 2 to sort the data of any additional column.
For example, first, select the Invert Elevation column and click the Up arrow to sort the data in ascending order. Then, while holding the [Shift] key, select the Downstream Link Slope column and click the Down arrow to apply a secondary sort.
Copying and Exporting Terminal Outfall Parameters
The data in the Terminal Outfall Parameters table can be copied to the clipboard or exported as a Microsoft Excel or PDF document by using the right-click context menu commands, such as Copy, Copy Table to Clipboard, Export Table to Excel, or Export Table to PDF.
After editing the required terminal outfall parameters, click the [Close] button to close the Terminal Outfall Table Edit dialog box.
