NCDOT Roadway Design Unit:

1. Attaching Ditch Component to Fill Slope Stake Point

At the template level, two options are available to attach ditch components to the fill slope stake point:

Attach the ditch component at every fill slope stake point at the end of each end condition segment.

Use ditch components which targets the fill slope stake point features. Although this method requires a proposed DTM to be generated first before the fill slope stake point feature can be targeted.

2. Locating Ditch Grade

Inside Roadway Designer, three preferred options are available to locate the ditch grade.

Use Point Control Vertical Alignment Mode to move the ditch base to a ditch grade stored in the (GPK and ALG).

Use Point Control Elevation and Grade Mode to set the beginning elevation and ditch grade. Station limits can be configured to a specific range.

Use Parametric Constraints to set the ditch depth, for example 1' minimum ditch.

Objective:

Incorporate Hydro ditches into the model. Use both methods to attach ditch components. Ditch transitions from cut to fill section or lateral ditch with no berm offset and transitions to or from a 5' ditch berm offset.

Dataset:

Video - Coming Soon
(Right-click on the video and select "Play" to play or pause the video)

Download dataset here... 8_Ditch.zip (1,348 KB)

NOTE: The content of the ZIP dataset file must be extracted to the root C:\ directory. Each chapter is then automatically expanded to the "C:\NCDOT Training\Roadway\CM" folder. This folder structure must be maintain to insure all saved ITL, DTM, and RDP paths are set accordingly.

Content:

08_Lateral_and_Roadway_Ditches.pdf
b4632.ird
b4632.itl
b4632.rdp
B4632_Rdy_cmd.dgn
b4632_rdy_ex.dtm
jobrdy.gpk
cmjobRDY.alg
cmjobRDY.xml

Exercises Summary:

Exercise 1 - DDE with Ditch Components Attachment at End Conditions
Exercise 2 - DDE with Ditch Components Attachment with Target Features
Exercise 3 - Modifying Roadway Ditch with Point Control Beginning Elevation and Ditch Grade

Exercise 1

NOTE 1: Exercise 1 - DDE with Ditch Components Attachment at End Conditions
NOTE 2: Method 1- Attach Left Ditch Component to Left End Conditions

Step 1.
While in the file b4632_rdy_cmd.dgn, launch the Geopak Corridor Modeling tool.

Step 2.
Load the file b4632.rdp preference file.

Step 3.
Load the jobrdy.gpk file.

Step 4.
Open Create Template dialog box.

Step 5.
Locate template -L- Road under the Templates\Mainline folder. Activate this template by double clicking on it.

Step 6.
Locate and highlight the component Special Lateral Ditch - LSO under the Components\Ditch folder. Do not activate this template by double clicking on it.

NOTE: Add as many ditch components to each fill slope stake points as required. May be up to 4 maximum fill slope stake points.

Step 7.
In the Preview window drag and drop the component Special Lateral Ditch - LSO into the -L- Mainline active template. Since by default the ditch component is turned off, use the highlighted square as the insertion point and place it on the left side fill slope stake points. For this exercise, there are two fill end conditions and therefore two fill slope stake points.

Step 8.
Verify the ditch components are there by clicking on the Active Template tab above the Preview window.

Step 9.
File, Save the ITL. Close out of the Create Template dialog box.

Step 10.
Launch Roadway Designer.

Step 11.
In Roadway Designer, load the b4632.ird file.

Step 12.
In the Template Drops dialog box, locate the -L- Road template under the Template\Mainline folder.

NOTE: Re-syncronize template drops (IRD) to the template library (ITL) with new modifications.

Step 13.
Highlight all of the -L- Road template drops rows and click on Synchronize with Library. Close out of the Template Drops dialog box.

Action: Synchronize with Library then Close

NOTE: Moving the inside ditch base points to the ditch grade with Point Controls. Add point controls for all fill slope stake points. May be up to 4 maximum points.

Step 14.
In the Point Controls dialog box, enter the following settings and Add it to the point control list.

Point: LT_DD_Base_In_CTL
Mode: Vertical
Control Type: Alignment
Horizontal Alignment: L
Vertical Alignment: LT_DT1
Start Station: 26+00
End Station: 27+00

Action: Add

Step 15.
Repeat the previous step for point LT_DD_Base_In_CTL1. Note that this required for all of the ditch component placed. Since this exercise involved just two ditch components on the left side, repeating the previous step is required only once. On a typical road template, you may have to repeat this step up to 3 times. Close out of the Point Controls dialog box when the two point controls has been added to the list.

Point: LT_DD_Base_In_CTL1
Mode: Vertical
Control Type: Alignment
Horizontal Alignment: L
Vertical Alignment: LT_DT1
Start Station: 26+00
End Station: 27+00

Action: Add then Close

Step 16.
Verify the ditch component is displayed on the left side from station 26+00 to 27+00.

NOTE: Transition Berm Offset Distance with Parametric Constraints

Step 17.
To transition the ditch berm offset distance from 0' to 5', use the parametric constraint DD_LT Berm Width. Enter the following settings in the Parametric Constraints dialog box and Add it to the Parametric Constraints list.

Constraint Label: DD_LT Berm Width
Start value: 0
Stop Value: -5
Start Station: 26+00
Stop Station: 26+50

Action: Add

NOTE: Changing the ditch base to a V ditch with Parametric Constraints.

Step 18.
To turn the default 2' base ditch to a V ditch, use the parametric constraint DD_LT Base Width. Enter the following settings in the Parametric Constraints dialog box and Add it to the Parametric Constraints list.

Constraint Label: DD_LT Base Width
Start value: 0
Stop Value: 0
Start Station: 26+00
Stop Station: 27+00

Action: Add then Close

Step 19.
Close out of the Parametric Constraint dialog box.

Step 20.
Verify the ditch component is displayed correctly on the left side from station 26+00 to 27+00.

NOTE: Preparing for the next exercise.

Step 21.
For the next exercise, a proposed DTM must already have been generated. Process All the template drops. Create Surface of the L corridor. Turn on New Surface for Each Corridor. Turn on Add Transverse Features and set the level. Turn on Features and Components if you want to display the proposed DTM in the design file. Click on Apply to create proposed surface DTM. Close out the Create Surface dialog box and save the b4632.ird. Close out of Roadway Designer.

Exercise 2

NOTE 1: DDE with Ditch Components Attachment with Target Features
NOTE 2: Method 2 - Attach Left Ditch Component by Target Features

Step 1.
While in the file b4632_rdy_cmd.dgn, launch the Geopak Corridor Modeling tool.

Step 2.
Load the file b4632.rdp preference file.

Step 3.
Load the jobrdy.gpk file.

Step 4.
Open Create Template dialog box.

Step 5.
Locate and activate the component Special Lateral Ditch - Target Features - LSO under the Components\Ditch folder.

Step 6.
Click on the Active Template tab near the top of the Preview window.

Step 7.
Double-click on the component LT Seek SS Fill Feature to edit it.

NOTE: Manually editing the default end condition target to your project specific needs.

Step 8.
Edit and verify the end condition properties. Apply and Close out of the Component Properties dialog box when finished editing. Save the ITL.

Target Type: Feature XYZ
Surface: L
Feature: LT_Slope_Fill

Action: Apply then Close

Step 9.
Close out of the Create Template dialog box.

Step 10.
Launch Roadway Designer.

Step 11.
In Roadway Designer, load the b4632.ird file.

NOTE: Each ditch will have its own corridor.

Step 12.
Use the Manage Corridors dialog box to Add a new corridor name L_LT Ditch 1. The Manage Corridors dialog box can be activated by clicking the Manage Corridors button (first button on the tool bar) or go to the menu and select Corridor, Corridor Management. After adding the new corridor Close out of the Manage Corridors dialog box.

Name: L_LT Ditch 1
Type: Alignment
Horizontal Alignment: L
Vertical Alignment: L
Start Station: 32+00
End Station: 34+50

Action: Add then Close

Step 13.
In the Template Drops dialog box, locate the component Special Lateral Ditch - Target Features -LSO under the Components\Ditch folder. Enter the following settings and Add it to the template drop list.

Corridor: L_LT Ditch 1
Station: 32+00
Interval : 10
Template: Special Lateral Ditch - Target Features -LSO

Action: Add then Close

Step 14.
Verify the ditch component is displayed correctly on the left side from station 32+00 to 34+50.

NOTE: Moving the inside ditch base point to the ditch grade with Point Controls.

Step 15.
In the Point Controls dialog box, enter the following settings and Add it to the point control list.

Point: LT_DD_Base_In_CTL
Mode: Vertical
Control Type: Alignment
Horizontal Alignment: L
Vertical Alignment: LT_DT2

Action: Add then Close

Step 16.
Verify the ditch component is displayed correctly on the left side from station 32+00 to 34+50.

NOTE: Transition Berm Offset Distance with Parametric Constraints

Step 17.
To transition the ditch berm offset distance from 5' to 0', use the parametric constraint DD_LT Berm Width. Enter the following settings in the Parametric Constraints dialog box and Add it to the Parametric Constraints list.

Constraint Label: DD_LT Berm Width
Start value: -5
Stop Value: 0
Start Station: 33+50
Stop Station: 34+50

Action: Add

NOTE: Changing the ditch base to a V ditch with Parametric Constraints.

Constraint Label: DD_LT Base Width
Start value: 0
Stop Value: 0
Start Station: 32+00
Stop Station: 34+50

Action: Add then Close

Step 19.
Verify the ditch component is displayed correctly on the left side from station 32+00 to 34+50.

NOTE: Optional, to display the L corridor roadway surface with the ditch component, use "Target Aliasing".
NOTE: Changing the color of the L corridor surface to blue for display purpose only.

Step 20.
In the Manage Corridors dialog box, highlight corridor L and change the Surface Symbology drop down list to Surface Symbology Blue. Click on the Change button and Close out of the dialog box.

Surface Symbology : Surface Symbology Blue

Action: Change then Close

NOTE: The order in the Aliases list is very important. The priority of which surface or corridor is targeted by the end condition is determined in this manner.

Step 21.
In the Target Aliasing dialog box (go to Tools, Target Aliasing),first Add Surface - B4632_rdy_ex then Corridor -L- to the Aliases list (right window). Click OK to close out of the dialog box.

Aliases:

Surface - b4632_rdy_ex
Corridor - L

Action: OK

Step 22.
Verify the ditch component and the L surface corridor are displayed correctly on the left side from station 32+00 to 34+50.

Exercise 3

NOTE: Exercise 3 - Modifying Roadway Ditch with Point Control Beginning Elevation and Ditch Grade
NOTE: Begin a ditch elevation and grade at station 35+00 to 35+70 (end of project) on the right side roadway cut ditch.

Step 1.
While in the file b4632_rdy_cmd.dgn, launch the Geopak Corridor Modeling tool.

Step 2.
Load the file b4632.rdp preference file.

Step 3.
Load the jobrdy.gpk file.

NOTE: If roadway cut ditches needed to be modified and the change must take place at the template level, a copy of the original roadway template must be made and all roadway cut ditch modifications are made there in the copied template.

Step 4.
Open Create Template dialog box.

Step 5.
Locate the template -L- Road under the Templates\Mainline folder. Make a copy of the template -L- Road and rename it -L- Road w/ Mod Cut Ditch in the same Mainline folder.

Step 6.
Activate the template -L- Road w/ Mod Cut Ditch.

NOTE: The default horizontal constraint and the corresponding parametric constraints are necessary to maintain a minimum ditch width per Design Manual Standards. When applying a special ditch grade to a roadway cut ditch, the constraint has to be changed from Horizontal to Vertical and the parametric Label must be removed to allow the ditch point to move to a specified ditch grade elevation.

Step 7.
Locate point RT_SS_Ditch_Base_Out (right roadway ditch point). Edit this point by changing Constraint 2 from Horizontal to Vertical and delete the Parametric Constraint Label. Apply and Close out of the Point Properties dialog box.

Constraint 2
Type: L_LT Ditch 1
Label: [blank]

Action: Apply then Close

Step 8.
Save ITL and Close out of the Create Template dialog box.

Step 9.
Launch Roadway Designer.

Step 10.
In Roadway Designer, load the b4632.ird file.

NOTE: Make the template drops at the station range of the modified roadway cut ditch only.

Step 11.
In the Template Drops dialog box, locate the template -L- Road w/ Mod Ditch under the Templates\Mainline folder. Enter the following settings and Add it to the template drop list. Remember to disable transition. Close out of the Template Drops dialog box.

Corridor: L
Station: 35+00
Interval : 10
Template: -L- Road w/ Cut Ditch
Enable Transition: (Unchecked)

Action: Add then Close

NOTE: Moving the roadway ditch base point to the ditch grade with Point Controls.

Step 12.
In the Point Controls dialog box, enter the following settings and Add it to the point control list. Close out of the Point Control dialog box when finished.

Point: RT_SS_Ditch_Base Out
Mode: Vertical
Control Type: Elevation and Grade
Elevation: 877.11
Grade:-2.0%
Start Station: 35+00
Stop Station:37+50

Action: Add then Close

Step 13.
Verify the roadway cut ditch is displayed correctly on the right side from station 35+00 to 35+70.


		The North Carolina Department of Transportation