2.0

Chapter 4 Working with Cross Sections
436
NOTE
For a material that expands 15 percent, enter the value 1.15. For a material
that shrinks to 93 percent of its original value, enter the value 0.93. A
factor of 1.00 does not adjust the volumes.
6
Specify the range of stations. The defaults for the beginning and ending stations
are based on the beginning and ending stations of the current alignment.
Accept the default, or enter a different range of stations.
7
Select the insertion point of the table when you are prompted to do so. This is
the upper left-hand corner of the table.
The following illustration shows a volume data table:
Volume data table
Calculating the Volume Data and Displaying the
Results on Screen
To calculate the volume data and display the results on screen
1
Generate the cross sections with the Edit Design Control command, if you
haven't done so already.
2
From the Cross Sections menu, choose Total Volume Output ä To Screen.
The following prompt is displayed:
Volume computation type (Prismoidal/Avgendarea) <Avgendarea>:
3
Specify the volume computation type: Prismoidal or Avgendarea:
n
Average End Area Calculation: For the average end method, the
calculations for volumes takes the area of cut or fill at one station plus the
area of the cut or fill at the next station divided by two, multiplied by the
distance between the stations. The commands calculate all data from the
actual values, but the reported values are rounded to the volume precision of
your choice.
n
Prismoidal Calculation: The prismoidal method of calculating volumes is
more accurate than the average end area method. However, this technique
involves a more complicated calculation and may take a longer time to
process.