A reach is a section of a stream or river along which similar hydrologic conditions exist, such as discharge, depth, area, and slope. In GeoSTORM software, routing reaches can be defined by either drawing or assigning polylines on the Map View using the following commands:
- Draw Routing Reaches
- Assign Routing Reaches
Draw Routing Reaches Command
Follow the steps below to use the Draw Routing Reaches command:
- From the Input ribbon menu, click the Routing Reaches dropdown menu and select the Draw Routing Reaches command.
- The Draw Routing Reaches dialog box will be displayed.
Drawing Routing Reach Polylines
The Draw Routing Reach Polylines section allows the user to draw single or multiple polylines on the Map View as routing reaches.
Follow the steps below to draw routing reaches:
- Click the [Draw] button and the dialog box will temporarily disappear.
![Draw Routing Reach Polylines section - [Draw] button](https://knowledge.civilgeo.com/wp-content/uploads/2024/10/Draw-and-Assign-Routing-Reaches-Command-Image-3.png)
- The status bar (shown under the Map View) will prompt the user to draw a reach polyline on the Map View in the upstream to the downstream direction.
Note: From the Routing Reach Specifications subsection of the Reach Naming panel, if:
- Routing reach ID naming option is selected, then the user can draw only one routing reach polyline on the Map View.
- Auto-name routing reach ID naming option is selected, then the user can continuously draw routing reach polylines one after the other on the Map View.
- After drawing routing reach polyline(s), the Draw Routing Reaches dialog box will be redisplayed, and the routing reach polyline(s) will be drawn on the Map View.
Notes:
- If the “Draw curvilinear polylines” checkbox is checked, then it allows the user to draw curvilinear polyline segments for the routing reaches.
- If the “Discard accidentally digitized reach less than” checkbox is checked, then the software discards accidentally digitized routing reaches that are shorter than the defined length. The user can define the length of the routing reach in the entry field adjacent to this checkbox option.
- The [Reverse Direction] button reverses the flow direction of the routing reach polyline drawn.
Naming Specifications
This section allows the user to define the naming specifications for each drawn routing reach along with the associated junctions and manholes.
Reach Naming
Routing Reach Specifications
The Routing Reach Specifications subsection under the Reach Naming panel allows the user to specify the routing reach ID for each drawn routing reach. The user can assign these IDs either manually or automatically using some predefined formats.
Follow the steps below to define naming specifications for routing reaches:
- If a routing reach is drawn while keeping the Routing reach ID radio button option selected, the user can manually enter the routing reach ID in the corresponding field, as shown below.
- If a routing reach is drawn while keeping the Auto-name routing reach ID radio button option selected, then it automatically names every newly drawn routing reach as per the user’s predefined naming formats, as shown below.
The following naming formats are available in the Auto-name routing reach ID radio button option:
- Routing reach ID prefix: This option allows a prefix to be added to the routing reach ID.
- Routing reach ID digits: This option permits the specification of a set number of digits to use for the routing reach ID. For example, using 3 digits causes the routing reach ID to be of the format 001, 002, 003, and so on as new routing reaches are created.
- Next available routing reach ID: This option defines the next routing reach ID number to be used.
- Routing reach ID increment: This option defines the increment to use when numbering routing reaches. The default value is 1.
- Routing reach ID suffix: This option allows a suffix to be added to the routing reach ID.
- Routing reach ID preview: This read-only field provides a preview of the routing reach naming specifications defined above.
Junction Naming
Auto-Name Junction ID
The Auto-Name Junction ID subsection under the Junction Naming panel allows the user to specify the IDs for each routing junction that are created automatically while drawing routing reaches. The user can assign these IDs automatically using some predefined formats, as shown below.
The following naming formats are available in the Auto-Name Junction ID subsection:
- Routing junction ID prefix: This option allows a prefix to be added to the routing junction ID.
- Routing junction ID digits: This option permits the specification of a set number of digits to use for the routing junction ID. For example, using 3 digits causes the routing junction ID to be of the format 001, 002, 003, and so on as new routing junctions are created.
- Next available routing junction ID: This option defines the next routing junction ID number to be used.
- Routing junction ID increment: This option defines the increment to use when numbering routing junctions. The default value is 1.
- Routing junction ID suffix: This option allows a suffix to be added to the routing junction ID.
- Routing junction ID preview: This read-only field provides a preview of the routing junction naming specifications defined above.
Manhole Naming
Auto-Name Manhole ID
The Auto-Name Manhole ID subsection under the Manhole Naming panel allows the user to specify the IDs for manholes associated with routing reaches. The user can assign these IDs automatically using some predefined formats, as shown below.
The following naming formats are available in the Auto-Name Manhole ID subsection:
- Manhole ID prefix: This option allows a prefix to be added to the manhole ID.
- Manhole ID digits: This option permits the specification of a set number of digits to use for the manhole ID. For example, using 3 digits causes the manhole ID to be of the format 001, 002, 003, and so on as new manholes are created.
- Next available manhole ID: This option defines the next manhole ID number to be used.
- Manhole ID increment: This option defines the increment to use when numbering manholes. The default value is 1.
- Manhole ID suffix: This option allows a suffix to be added to the manhole ID.
- Manhole ID preview: This read-only field provides a preview of the manhole naming specifications defined above.
Assigning Invert Elevation
This section allows the user to assign an invert elevation to the routing reaches using a terrain model.
Note: This section is common to both the Draw Routing Reaches and Assign Routing Reaches dialog boxes.
Terrain Elevation Source
Depending upon the type of terrain elevation source selected, the content of the Assign 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 content of the Assign 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 content of the Assign 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 content of the Assign Invert Elevations section changes, as shown below.
The following options are displayed when the 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.
Other Specifications
This section allows the user to define the following physical properties for the drawn routing reaches:
- Cross section shape: This dropdown combo box is used to specify the cross section shape to be used with the routing reach. The following entries are provided:
- Irregular (HEC-RAS Style) Channel
- Rectangular Channel
- Trapezoidal Channel
- Triangular Channel
Note: All the options under the Other Specifications section will not be displayed if Irregular (HEC-RAS Style) Channel is selected as the cross section shape.
- Channel height: This entry field defines the height (or depth) of the selected channel shape. Flow that overtops this height is lost as overflow from the system. This entry field is disabled for the Irregular (HEC-RAS Style) Channel cross section shape.
- Channel bottom width: This entry field defines the bottom width of the selected channel shape. This entry field is disabled for the following cross section shapes:
- Triangular Channel
- Irregular (HEC-RAS Style) Channel
- Channel side slope (V:H): This entry field defines the side slope of the channel sides. This entry field is disabled for the following cross section shapes:
- Rectangular Channel
- Irregular (HEC-RAS Style) Channel
- Manning’s roughness: This entry field defines the Manning’s roughness. Clicking the […] lookup button displays the Manning’s Roughness lookup dialog box, which allows the user to select a Manning’s roughness coefficient to be assigned to a routing reach.
After defining all the required data, click the [Apply] button to complete drawing routing reaches. Note that if routing reaches are drawn using the Auto-name routing reach ID option, then the [Apply] button will be displayed disabled since the just drawn routing reaches have already been named and created.
Assign Routing Reaches Command
Follow the steps below to use the Assign Routing Reaches command:
- From the Input ribbon menu, click the Routing Reaches dropdown menu and select the Assign Routing Reaches command.
- The Assign Routing Reaches dialog box will be displayed.
Selecting Routing Reach Polylines
The Select Routing Reach Polylines section allows the user to manually assign single or multiple polylines on the Map View as routing reaches.
Follow the steps below to assign polylines as routing reaches:
- Click the [Pick] button and the dialog box will temporarily disappear.
![Select Routing Reach Polylines section - [Pick] button](https://knowledge.civilgeo.com/wp-content/uploads/2024/10/Draw-and-Assign-Routing-Reaches-Command-Image-16.png)
- The status bar (shown under the Map View) will prompt the user to click near the downstream end of the already drawn routing reach polyline on the Map View to select it.
Note: From the Routing Reach Specifications section, if:
- Routing reach ID naming option is selected, then the user can select only one routing reach polyline from the Map View.
- Auto-name routing reach ID naming option is selected, then the user can select routing reach polylines one after the other from the Map View.
- After selecting polyline(s), the Assign Routing Reaches dialog box will be redisplayed and the routing reach polyline(s) will be selected on the Map View.
Notes:
- If the “Discard accidentally digitized reach less than” checkbox is checked, then the software discards accidentally digitized routing reaches that are shorter than the defined length. The user can define the length of the routing reach in the entry field adjacent to this checkbox option.
- The [Reverse Direction] button reverses the flow direction of the routing reach polyline assigned.
Routing Reach Specifications
This section is similar to the Routing Reach Specifications subsection explained above for the Draw Routing Reaches dialog box.
Assigning Invert Elevation
This section is similar to the Assign Invert Elevation section explained above for the Draw Routing Reaches dialog box.
Other Specifications
This section is similar to the Other Specifications section explained for the Draw Routing Reaches command. This section contains an additional “Create junctions (if missing) at reach ends” checkbox option. This checkbox option allows the software to create a junction at the routing reach ends if there is no node already defined within the connection snap distance. The junction invert elevation is set equal to the routing reach invert elevation.
After defining all the required data, click the [Apply] button to complete the process of assigning routing reaches. Note that if routing reaches are assigned using the Auto-name routing reach ID option, then the [Apply] button will be displayed disabled since the just assigned routing reaches have already been named and created.