2.0

Table Of Contents
Drawing Vertical Curves for Ditches and Transitions
223
Drawing a Vertical Curve Based on a
Minimum K Value
This command calculates and drafts a vertical curve with given tangents and a
given minimum K value. The K value of a vertical curve is the horizontal
distance required to affect a 1% change in grade on the vertical curve: (K =
Length of curve / (|Grade in| - |Grade out|)
To draw a vertical curve based on K value
1 From the Profiles menu, choose DT Vertical Curves to display the Vertical
Curves dialog box.
2 In the Description list, select the K Value option. You can also click the K Value
icon, and then click OK.
3 Select the tangents that represent the grade coming into and out of the PVI.
4 Enter a minimum K value.
The command calculates the necessary length of curve for the given minimum
K value and displays the value with the prompt Length of the curve.
5 Press ENTER to accept the length of curve for the given minimum K value.
If you enter a new length, then the command recalculates the K value and
draws the curve with the specified length.
The following illustration shows a vertical curve based on the K value:
Drawing a vertical curve by K value