I am designing a retention pond in an existing surface. I set the base of the pond and execute the grading at the desired slope and it generates the pond just fine, with the exception of rounded corners. I need the corners to be square, mitered corners instead of the round. Is that possible? And how?
I'm using Civil 3D 2013.
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Solved by neilyj666. Go to Solution.
Use featurelines instead of the projection grading. Take the bottom featureline and use the Stepped Offset command to create the top, then offset that to create the next piece and then, if needed, use the projection grading to tie it into the existing ground.
Thanks.
So, what you're saying is that I do the stepped offset until I get close to the surface, then let use the projection grading on that last contour to tie into the existing grade.
I'm thinking I will still have a rounded corner, but not as extreme. Is that right?
Gradings alone cannot create mitered corners. As was suggested, you can use stepped offsets to create mitered corners for the interior parts of the pond. Then use a grading to establish the daylight footprint and add featurelines and infills to to create the mitered corners. Of course the mitered corners will not be dynamic to edits to the grading and would potentially make your grading prone to corruption or crashing when editing, so you'd want to use some technique to keep the featurelines from interacting with the gradings during edits.
Due to this limitation of gradings most of your model will not be dynamic. Some have used corridors as a workaround but corridors have probems with mitered corners as well.
This is a long process but it might do what you want:
1. Offset the feature line at the desired grade to an elevation that is beyond (above) the ground target.
2. Make a temp surface and add these lines to it, make sure the triangles are correct at the corners.
3. Make a volume surface with the ground and your temp surface.
4. In the volume surface, make a user defined contour with elevation of 0.00'
5. Extract that contour (extract objects -> user defined contours)
6. Make the pond surface with your original pond bottom line and the user defined contour you just extracted.
Shape of corners will depend on the shape of the ground target.
-Mark
@907Trekker wrote:This is a long process but it might do what you want:
1. Offset the feature line at the desired grade to an elevation that is beyond (above) the ground target.
2. Make a temp surface and add these lines to it, make sure the triangles are correct at the corners.
3. Make a volume surface with the ground and your temp surface.
4. In the volume surface, make a user defined contour with elevation of 0.00'
5. Extract that contour (extract objects -> user defined contours)
6. Make the pond surface with your original pond bottom line and the user defined contour you just extracted.
Shape of corners will depend on the shape of the ground target.
-Mark
Yes, this method will work but you will need to convert the 0.00' contour to a featureline with levels taken from the original ground.
neilyj (No connection with Autodesk other than using the products in the real world)
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Forgive my ignorance, but I can't see that you can "add" feature lines to a surface like you say in step 2. Any help on this?
Use the Proposed base (Featureline1), and then offset and raise elevation as directed (Featureline2). Add Feature 1 & 2 to temp surface ,then proceed as directed. You may need to swap TIN lines or connect corners (top to bottm) with featurelines (and add these to surface)
neilyj (No connection with Autodesk other than using the products in the real world)
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Yes, I've done the offsets to the proper elevations. I also have the temp surface created.
I just don't see the steps for adding the feature lines to a surface.
Select the two featurelines and then there's an option in the contextual ribbon to add to surface as breakline
neilyj (No connection with Autodesk other than using the products in the real world)
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Yes, forgot that step. The pond would have been a pyramid instead. Thanks.
Thank you!
I don't exactly understand some of the steps (mostly the 0 elevation contour) but it worked!
Hi Ed,
you should take a look at the video's in the Autodesk University web site, there's one called "Islands in the Asphalt: Parking Lot Grading for Commercial Site Projects" its not a pond design but very useful for learning how to use featurelines and grading.
Gerry
Basically you are using the feature lines to create a surface that is the correct shape and then trimming it with the original ground surface.
In a volume surface the contours represent how high one surface is above the other, at elevation 0 they intersect or are at the same elevation. That is where your pond daylighted to the original ground, at least in the x,y plane. You modified the elevation to match your original ground in the step that I forgot to include in my original post.
Thanks for the help on this. I know I did this last week, but it was right before vacation and well, you know...
Anyway, I need help with step 4. Making a user defined contour with elevation of 0.00'
Any help would be appreciated.
OK - it looks like I'm going to need help with this again.
In the attached drawing file I've got two surfaces:
"Surface 1" is the existing ground surface.
"Pond Final A" is a retention pond that I designed starting with the bottom elevation of 7240 and working my way up at a 3:1 slope past the existing surface.
Now I need to "trim" the pond at the existing surface and cannot seem to figure out how to do this.
I would appreciate any help you can give.
Thanks so much!
---sigh---
You can ignore those last two posts. I didn't have the pond extended high enough for the "0" contour to be made. Sorry to have bothered you and thanks again.
What kind of equipment in the field can actually grade mitered corners?