Enforcing a 2% grade

[Matthew Timion]

Hello all!

I have an elevated TC line and a RW line that is not elevated. Is there a
way that I can elevate the RW while enforcing a 2% slope from TC? Can I
also do this by enforcing a 2:1 slope?

As of now I draw a breakline from the TC to the RW, and then elevate the
breakline using "2dto3dpl" (2% or 2:1). I then elevate the RW by using the
command "2dto3dp," elevating the line by any intersection points with the
breaklines. I'm sure that there is a better way.

--
Matt Timion
Earthwork Calculation Services

[Nava Ran]

Offset the TC 3D Polyline horizontal and vertical to get 2% or 2:1.
The horizontal offset amount must be greater than the distance from TC to
ROW.
Draw a triangulation network 3D Faces(select TC and the offset 3D Polyline)
and then use Profile from Surface Entities to get the elevations along the
ROW.

Harry Ran

"Matthew Timion" <mtimion@dirtestimator.com> wrote
news:bhh2ui$v4j$1@update.carlsonsw.com...

Hello all!

I have an elevated TC line and a RW line that is not elevated. Is there a
way that I can elevate the RW while enforcing a 2% slope from TC? Can I
also do this by enforcing a 2:1 slope?

As of now I draw a breakline from the TC to the RW, and then elevate the
breakline using "2dto3dpl" (2% or 2:1). I then elevate the RW by using
the
command "2dto3dp," elevating the line by any intersection points with the
breaklines. I'm sure that there is a better way.

--
Matt Timion
Earthwork Calculation Services

[Terry Scanlon]

"Matthew Timion" <mtimion@dirtestimator.com> wrote in message
news:bhh2ui$v4j$1@update.carlsonsw.com...

Hello all!

I have an elevated TC line and a RW line that is not elevated. Is there a
way that I can elevate the RW while enforcing a 2% slope from TC? Can I
also do this by enforcing a 2:1 slope?

As of now I draw a breakline from the TC to the RW, and then elevate the
breakline using "2dto3dpl" (2% or 2:1). I then elevate the RW by using
the
command "2dto3dp," elevating the line by any intersection points with the
breaklines. I'm sure that there is a better way.

--
Matt Timion
Earthwork Calculation Services

I'm sure there's many ways of getting there. Here are a few:

1. If the RW is parallel to TC one can of course use 3doffset.

2. Command: "3dintersect"
I believe this command is terribly misplaced in the Design menu of the
COGO module. It seems like it would be more appropriate to be in the
3dpoly menu of DTM.

This command allows you to pick a reference 3d polyline and multiple
target polylines to which it will apply a projected grade. The polys
must
be on separate layers, and it is sometimes quirky...but it can be quite
powerful.

3. As in Nava's solution, one can 3doffset the TC beyond the RW and create
a
surface model. Instead of creating a profile though, one can use your
2dto3dp
using the surface model.

Terry Scanlon

[Matthew Timion]

Thanks Terry.

I've already used your first solution, but unfortunately the TC in this job
seems to meandure a bit, so the TC and RW are not parallel. I've also used
the 3d surfaces and used "2dto3dp" to elevate. That seemed a little time
consuming, especially in a 100 acre job. It might be the only solution.

I will check out 3dintersect.

--
Matt Timion
Earthwork Calculation Services
"Terry Scanlon" <tpsx@dbfinc.com> wrote in message
news:bhil6r$9bd$1@update.carlsonsw.com...

1. If the RW is parallel to TC one can of course use 3doffset.

2. Command: "3dintersect"
I believe this command is terribly misplaced in the Design menu of the
COGO module. It seems like it would be more appropriate to be in the
3dpoly menu of DTM.

This command allows you to pick a reference 3d polyline and multiple
target polylines to which it will apply a projected grade. The polys
must
be on separate layers, and it is sometimes quirky...but it can be
quite
powerful.

3. As in Nava's solution, one can 3doffset the TC beyond the RW and
create
a
surface model. Instead of creating a profile though, one can use
your
2dto3dp
using the surface model.

Terry Scanlon

[Matthew Timion]

I've tried to get 3dintersect to work for me and it keeps giving me the
wrong results, which is unfortunate. I tell it to enforce a 2% slope and I
either keep getting 2.3% or 4%, which is rather annoying. I might just
stick with using 3d faces for now.

Thanks for your help!

--
Matt Timion
Earthwork Calculation Services
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