In GeoSTORM software, the Assign Manhole Elevations command allows the user to assign rim and invert elevations to the selected manhole(s). This command uses the elevation terrain surface to compute the rim and invert elevation of an individual manhole(s) with respect to the terrain surface available in the project.
Follow the steps below to use the Assign Manhole Elevations command:
- From the Input ribbon menu, click the Manhole Structures dropdown menu and select the Assign Manhole Elevations command.
- The Assign Manhole Elevations dialog box will be displayed, as shown below.
The following sections describe how to use the Assign Manhole Elevations command and interact with the above dialog box.
Selecting Manholes
The Select Manholes section allows the user to select one or more manholes to assign rim and invert elevations. This section includes a table that lists all the manhole(s) contained within the current scenario of the project, as shown below.
The user can select manhole(s) using any of the following methods to assign rim and invert elevations:
- Check the checkboxes corresponding to each manhole in the Select Manholes section.
- Click the [Pick] button, the Assign Manhole Elevations dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user to select the manhole(s) from the Map View. After selecting the manhole(s), press the [Enter] key or right-click and choose Done from the displayed context menu. The Assign Manhole Elevations dialog box will be redisplayed.
- Alternatively, press and hold down the [Ctrl] key while selecting the manhole(s) directly from the Map View. When finished, open the Assign Manhole Elevations dialog box, and the selected manhole(s) will be shown as selected/checked within the Select Manholes section.
After selecting the manhole(s), the total number of selected manhole(s) will be displayed in the Total selected read-only field, as shown below.
Assign Rim and Invert Elevations
This section allows the user to:
- Assign the rim and invert elevations to the manhole(s) using a terrain model.
- Define the invert depth using the Manhole depth entry field to raise or lower the invert of the manhole by the specified amount. A negative invert depth value lowers the manhole by the specified amount.
- Define the sump depth required at a manhole using the Sump depth entry field. The sump depth of the manhole represents the vertical offset from the manhole bottom invert elevation to the lowest invert of the connected pipes.
Terrain Elevation Source
Depending upon the terrain elevation source type selected, the contents of the Assign Rim & Invert Elevations section changes to specify additional elevation data information.
The Terrain elevation source dropdown combo box supports the following surface types:
- Elevation Grid
- LandXML Data
- TIN surface
Elevation Grid
If the user selects Elevation Grid as the terrain elevation source, the contents of the Assign Rim & Invert Elevations section changes, as shown below.
The following option is displayed when Elevation Grid is selected as the terrain elevation source:
- Elevation grid layer
This dropdown combo box allows the user to select the elevation grid layer available in the project.
LandXML Data
If the user selects LandXML Data as the terrain elevation source, the contents of the Assign Rim & Invert Elevations section changes, as shown below.
The following options are displayed when LandXML Data is selected as the terrain elevation source:
- TIN surface layer
This dropdown combo box allows the user to select the TIN surface layer type.
- TIN surface
This dropdown combo box allows the user to select the TIN surface type.
TIN Surface
If the user selects TIN Surface as the terrain elevation source, the contents of the Assign Rim & Invert Elevations section changes, as shown below.
The following options are displayed when TIN Surface is selected as the terrain elevation source:
- TIN surface layer
This dropdown combo box allows the user to select the TIN surface layer type.
- TIN surface
This dropdown combo box allows the user to select the TIN surface type.
Assigning Manhole Elevations
Once the data have been defined in the Assign Manhole Elevations dialog box, click the [Assign] button and the software will assign the rim and invert elevations to the selected manhole(s).