2.0

Table Of Contents
Drawing Vertical Curves for the Finished Ground Centerline
203
The High/Low Point option displays the high/low station and elevation for
the curve drawn. If a high or low point cannot be calculated for the selected
tangents, a message is displayed that says: No high or low point exists for
this curve.
The following illustration shows the parameters used in calculating a vertical
curve based on a high/low elevation point:
Drawing a vertical curve by elevation point
Drawing a Vertical Curve Through a Point
One method of drawing a vertical curve is to specify a point for the vertical
curve to pass through.
To draw a vertical curve that passes through a selected point
1
From the Profiles menu, choose FG Vertical Curves to display the Vertical
Curves dialog box.
2
Select the Through Point option by clicking its name in the Description list.
You can also click the Through Point icon, and then click OK.
NOTE
If you do not see the graphic representation of the curve type you want to
create, then click the Next or Previous button at the bottom of the Vertical
Curves dialog box.
3
Select the tangents that represent the grades going into and out of the PVI.
4
Select the point for the vertical curve to pass through, or press ENTER, and then
type a station number and elevation. The length of the curve is calculated.
5
Press ENTER to accept the length of curve required to pass exactly through the
given point, or enter a new length.
n
Enter a smaller length to have the vertical curve pass above the indicated
point in a crest curve, and below the selected point in a sag curve.
n
Enter a greater length to have the vertical curve pass below the indicated
point in a crest curve, and above in a sag curve.
If the command cannot construct a vertical curve through the point you
selected, an error message appears stating that the function is undefined for
the argument.