2.0

Table Of Contents
Calculating Cross Section Volumes
445
The following example shows a typical subsurface volume report. A summary of
the total volumes of cut for each existing subsurface is reported at the end of
the file:
page 1
Hillsboro Bypass Phase 2
Project: ROUTE202 Tue Nov 2 17:00:00 1999
Alignment: 202CL
SURFACE: clay
SUBSURFACE AVGENDAREA VOLUME LISTING WITH CURVE CORRECTION
Station Area (sqft) Volume (yds) Tot Vol (yds)
--------------------------------------------------------------
10+00 80.33
147.76 147.76
10+50 79.26
146.03 293.79
11+00 78.45
139.39 433.19
11+50 72.14
132.32 565.50
12+00 70.77
134.63 700.14
12+50 74.66
130.53 830.67
13+00 66.64
113.03 943.70
Calculating the Strip Volume Data for the Top
Surface and Saving it to a File
The Strip Surface command reports the strip volumes of the top surface. This
command can also report the strip volumes of all surfaces above a selected
surface.
To report the strip volumes of the top surface
1 Create your subsurfaces using multiple surfaces or Interpolation Control of
existing ground cross sections, if you haven't done so already.
2 From the Cross Sections menu, choose Surface Volume Output ä Strip Surface.
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.
The prismoidal method calculation is:
Total sum of cut (or fill) area at first station (A1), cut (or fill) area at second
station (A2) plus the square root value of A1*A2. Divide the total sum by 3
and multiply by the distance between the two sections.