2.0

Drawing Vertical Curves for Ditches and Transitions
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The following illustration shows the parameters used in calculating a vertical
curve based on design velocity:
Designing a vertical curve by velocity
Defining a Grade Break Without a Vertical Curve
To define a PVI without a vertical curve
1
From the Profiles menu, choose DT Vertical Curves to display the Vertical
Curves dialog box.
2
In the Description list, select the Grade Break option. You can also click the
Grade Break icon, and then click OK.
3
Select a grade break.
This is the intersection of two vertical tangents. The object snap,intersection, is
automatically set.
The Grade Break option assigns a vertical curve of zero length to the Point of
Vertical Intersection (PVI) selected. The PVI block is drawn on the specified
finished ground layer. The command reports No intersection found at selected
PVI point if the selection point is not the intersection of two lines.
Listing the Vertical Curve Data
You can retrieve vertical curve data by using the List ä Vertical Curves
command. This command lists the beginning and ending stations of the BVC
(Beginning of Vertical Curve), PVI (Point of Vertical Intersection), EVC (End of
Vertical Curve), and high point/low point, as well as the grade in, grade out,
grade change, curve length, and K value.
To list vertical curve data
1
From the Profiles menu, choose List ä Vertical Curves.
2
Select the vertical curve.