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Chapter 4 Working with Cross Sections
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NOTE
The maximum design slopes are only used in cases where the typical
design slope fails to match to existing ground within the right-of-way when
the right-of-way hold is selected. They are also used when the typical
design slope fails to match to existing ground within the sample swath
width when the right-of-way hold is cleared.
If the design slope fails to match within the limitations of the existing ground,
the template is forced to tie into the edge of the existing ground using whatever
slope is necessary. If this happens, resample existing ground using a wider swath
width and reprocess the cross sections.
If ditches are not used, the slope starts from the outer connection point of the
outermost subassembly and matches into the existing surface. If ditches are
used, the slope starts from the outer edge of the defined ditch and matches into
the existing ground. A slope of zero (0) creates a vertical line.
NOTE
It is advisable to specify proper values of typical and maximum slopes, even
if you are using depth controlled slopes  as the depth criteria calculations
are based on the typical slopes entered here.
8 Specify the right-of-way values:
n
Hold check box: Select the Hold check box to use the typical slope, unless it
exceeds the right-of-way offset. If this occurs, then the slope matches into
the right-of-way line and increases the slope. If the increased slope is steeper
than the maximum slope specified, then the right-of-way is ignored and the
slope applied becomes the maximum slope specified. Clear the Hold check
box to use only the typical slope.
n
Offset: If you specify an offset distance here, the offset distance remains
constant throughout the range of stations. Alternatively, defined horizontal
alignments can be specified to graphically indicate the offset distances using
the Attach Alignments option from the Design Control dialog box. This is
useful not only to define the right-of-way graphically, but also ditches and
transition alignments. By attaching alignments to the offset distances,
transitioning and stretching can be dealt with graphically rather than
mathematically.
n
Type of Hold: Use maximum slope (default) or Override Maximum Slope.
When Use Maximum Slope is selected, the ROW line forces the slope to
become steeper and meet existing ground at the ROW line, until the
maximum slope is reached. The slope does not become any steeper than the
maximum slope, regardless of the ROW width. When Override Maximum
Slope is selected, the ROW offset forces the slope to continually become
steeper to match existing ground at the ROW line, regardless of what is
entered as the Maximum slope value.
NOTE
The right-of-way hold is used in conjunction with the typical and maximum
slopes.
9 Click OK to return to the Design Control dialog box.
10 Click OK to process the sections to display the Process Sections dialog box.
11 Click OK to exit the command.