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Table Of Contents
Calculating Cross Section Volumes
437
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.
A prompt is displayed asking if you would like to use curve correction.
4 Specify whether to use curve correction:
n
Type Y to use curve correction.
n
Type N to skip this option.
In normal volume calculations, the length between the end areas on horizontal
curves is taken from the length along the centerline curve. With curve
correction in use, the length is taken from the path of the average centroid of
the areas for a more accurate result.
A prompt is displayed asking if you want to use volume adjustment factors.
5 Specify whether you want to use volume adjustment factors:
n
Type Y to use volume adjustment factors. You are then prompted for the cut
and fill adjustment factors.
n
Type N to skip this option.
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.
The To Screen command displays the cut and fill volume information on the
screen, opening an AutoCAD text window. The display includes the station cut
and fill areas, station cut and fill volumes, and cumulative volumes. The To
Screen output pauses after each screen.
7 Press any key to view the next screen of information.
The following is a sample of the cutting and fill volume information output:
END AREA VOLUME LISTING WITH CURVE CORRECTION
Cut Fill Cut Fill
Station Area (sqft) Area (sqft) Cumulative Cumulative
Volume (yds) Volume (yds) Volume (yds) Volume (yds)
-----------------------------------------------------------------
10+00 204.48 581.87
374.53 1088.16 374.53 1088.16
10+50 200.02 594.14
362.64 1112.01 737.18 2200.17
11+00 191.64 606.82
336.64 1164.72 1073.82 3364.89
11+50 171.94 651.07
313.12 1213.69 1386.94 4578.59
12+00 166.23 659.71
307.89 1238.35 1694.84 5816.94
12+50 166.29 677.71
292.28 1292.84 1987.12 7109.78
13+00 149.38 718.56
257.14 1370.82 2244.26 8480.60