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how to grade intersecting swales

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Message 1 of 3
cadconfused
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how to grade intersecting swales

How do you grade two swales intersecting like in the picture I have attached?

 

Thanks for any help.

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Message 2 of 3
owenmull
in reply to: cadconfused

I would start by creating a corridor from both your alignments, create your desired assembly, profile, etc information, and then create a corridor surface from each. Then you could paste one into the other.

 

You may end up with some funky contours where the swales meet. Another option is to use conditional subassemblies and a daylight line on the EG surface to target, and that will solve that issue. To do this, here is what I would do:

 

1. Set up a Swale assembly. Use 'DaylightBasin2' as your subassembly, and modify its properties to represent the geometry of your swale ditch. (Or any general link that has width/offset and surface targeting capability)

2. Set up a profile for each Swale alignment as desired.

3. Create Swale 1 Corridor, using the previously mentioned components.

4. Create Swale 1 Corridor Surface, add extents as border.

5. Create Swale 2 Corridor, using the previously mentioned components.

6. Create Swale 2 Corridor Surface, add extents as border.

7. Extract the surface borders for each surface, convert said line to 2D.

8. Trim/Extend/Polyline edit the resulting polyline to match.

9. Use the polylines as Width or Offset Targets for both corridors.

 

You can tweak the corridor stationing to match your polylines. This may help. clean up messy contours.

 

HTH

-Owen
Windows 7 x 64 bit

Civil 3D 2017
______________________________________________________________
Usually, I find that the problem is between the keyboard and the chair.
Message 3 of 3
sboon
in reply to: owenmull

My solution is a little different than Owen's. 

 

I started with one assembly that daylights to surface on both sides.  I then made two copies, and substituted LinkOffsetAndSlope in one side of each of them.

 

Clipboard01.png

 

I then built a corridor with two baselines, and used the original assembly for both of them.  This allowed me to locate the point where the two daylights intersected.  I added the yellow featureline from that intersection down to the point where the two centerlines intersect at the EC of the curve.  I then split the corridor regions at the ends of the featureline, and replaced the assemblies.  The LinkOffsetAndSlope subs on each side were targeted horizontally and vertically to the featureline.

 

Clipboard02.png

 

Here's the final corridor surface.

 

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

Clipboard03.png

 

Steve
Expert Elite Alumnus

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