Junction Data Command

Junctions define the elements (i.e., nodes, manholes, confluences, etc.) where rivers, streams, and stormwater pipes combine flow as it is being routed through the stormwater network model. Junction elements can have one or more inflows, but only one outflow. In addition, subbasins can be connected to junctions.

In GeoHECHMS, the Junction Data command allows the user to add new junctions and edit junction data in a project.

From the Input ribbon menu, select the Junction Data command.
Alternatively, the user can either double-click on the junction node from the Map View or choose the Junction Data command from the Routing Junctions dropdown menu of the Input ribbon menu.
The Junction Data dialog box will be displayed.

The following sections describe how to use the Junction Data command and interact with the above dialog box.

Selecting Junction

The Select Junction section allows the user to select the junction for defining the junction data. The user can create a new junction, copy existing junction data to a new junction, and delete a junction. In addition, the user can navigate between junctions and enter a description detailing the defined junction.
Selecting Junction

The following options are provided in this section:

Junction ID
This dropdown combo box lists all the junctions that are defined in the model. The user can select the desired junction from the dropdown combo box. Click the pencil icon to edit the junction ID.
The user can navigate between the previous and next junctions using the up and down arrow buttons. Alternatively, the user can click the […] button to select the junction from the Map View.
Note that the up and down arrow buttons will be disabled (i.e., grayed out) when the model contains only a single junction.
Description
This text field allows the user to enter additional information that describes the selected junction.
New
The [New] button allows the user to create a new junction. On clicking this button, the dialog box will temporarily disappear. A prompt will be displayed on the status bar informing the user to place a junction on the Map View. Click on the Map View to place the junction. Following the placement of a junction, the dialog box will be redisplayed. Next, enter the junction name in the Junction ID entry field and click the [Accept changes] button.
The software checks that the defined ID is unique. If not, a warning dialog box is displayed as shown below. Click the [OK] button and the user is then returned to the Junction ID field to change the ID.
Copy
This button causes the software to copy existing junction data to a new junction. On clicking the [Copy] button, the software automatically provides a unique default name for the duplicated junction. The user can use the default name or enter a different valid and unique ID before moving on to add any other data.
Delete
This button allows the user to delete the current junction data from the model. On clicking the [Delete] button, the following confirmational dialog box is displayed.
Click the [Yes] button to delete the selected junction.
Click the [No] button to abort the deletion process.

Junction Specifications

This section allows the user to define the data to be used for the current junction.
Junction Specifications

The following options are provided in this section:

Invert elevation
This entry field defines the invert elevation of the selected junction. The other basin elements such as reach that can connect to the junction do require an invert elevation based upon the specific parameters.
Downstream connection
This entry field defines the downstream connection that the selected junction drains to. Clicking on the […] button allows the user to select the downstream elements from the Map View. The following elements can be selected:
1. Diversion
2. Junction
3. Reach
4. Sink
5. Storage Area
The user can click the [Clear] button to cancel the previous selection and redo the entire process.

Computational Results

This section allows the user to see the analysis results for the current junction that were computed by HEC-HMS.
Computational Results

Note that the Detailed Results section provides additional analysis results for the current junction that were computed by HEC-HMS.

DSS Data

This section displays information related to the output DSS (Digital Storage System) file generated for the HEC-HMS computational results.
DSS Data

DSS file name: This entry defines the external DSS file to be used for reading the data.
Data path: This entry denotes the data path within the DSS data file which contains the paired data.