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Grading downward to surface

8 REPLIES 8
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Message 1 of 9
jsolberg
2326 Views, 8 Replies

Grading downward to surface

I have a feature line that is below the surface of an existing earth dam embankment. I want to grade downward from that feature line at a shallow slope until it daylights somewhere down the embankment slope. How do I accomplish this? All I can get it to do is slope upward (cut) to the existing surface.

8 REPLIES 8
Message 2 of 9
Joe-Bouza
in reply to: jsolberg

Can you post a picture? I can't see why it couldn't be done when I sketch you description.

 

One option is to over grade at you slope make a surface, compare and plot the zero contout to find you daylight.

Thank you

Joseph D. Bouza, P.E. (one of 'THOSE' People)

HP Z210 Workstation
Intel Xeon CPU E31240 @ 3.30 Hz
12 GB Ram


Note: Its all Resistentialism, so keep calm and carry on

64 Bit Win10 OS
Message 3 of 9
Neilw_05
in reply to: jsolberg

Look at the help file for the setting shown in this screen capture.

 

 

Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 4 of 9
d1of2
in reply to: jsolberg

Here is what you do. Create a temporary surface with the slope you are looking for from the feature line. Make sure that temporary surface extends beyond the limits of the earthen dam.

 

Then create a TIN volume surface between the earthen dam and your temporary surface. use a surface style on the volume surface you can see contours on. Create a user defined contour at elevation 0. This will be the intersection between you temporary slope and the earthen berm.

 

Extract the 0 elevation contour and use it to get elevations from your earthen berm surface. Add it to a new surface with your original feature line... There you go!

Windows 7 64
Intel Core i7 2.0 GHz 2.0 GHz
8 GB RAM
Nvidia GeForce GTX460M
Civil 3D 2012 SP2.1
Message 5 of 9
neilyj666
in reply to: d1of2


@d1of2 wrote:

Here is what you do. Create a temporary surface with the slope you are looking for from the feature line. Make sure that temporary surface extends beyond the limits of the earthen dam.

 

Then create a TIN volume surface between the earthen dam and your temporary surface. use a surface style on the volume surface you can see contours on. Create a user defined contour at elevation 0. This will be the intersection between you temporary slope and the earthen berm.

 

Extract the 0 elevation contour and use it to get elevations from your earthen berm surface. Add it to a new surface with your original feature line... There you go!


You could also omit the italicised section and simply use the MinimumDistBetweenSurfaces tool (best used in 2012/2013 as this creates a 3D polyline but 2011 can be used with a little more work)

 

neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2024 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
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Message 6 of 9
Neilw_05
in reply to: Neilw_05

Guys, I think you are making this far too complicated. All you need to do is change that search order setting to Fill First and the grading will then look for a solution downward rather than upward when in cut.

Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 7 of 9
Joe-Bouza
in reply to: Neilw_05

Good one Neil, I never saw that setting

Thank you

Joseph D. Bouza, P.E. (one of 'THOSE' People)

HP Z210 Workstation
Intel Xeon CPU E31240 @ 3.30 Hz
12 GB Ram


Note: Its all Resistentialism, so keep calm and carry on

64 Bit Win10 OS
Message 8 of 9
jsolberg
in reply to: jsolberg

I appreciate the responses. My immediate need was solved by setting fill first. There are other issues with trying to grade this project that have me reaching for the gun. I was doing this type of stuff easily with simple add-on tools twenty years ago. Why simple tasks have to be so complicated in Civil 3D is beyond me. Sorry, had to vent! I do appreciate the help.

Message 9 of 9
Joe-Bouza
in reply to: jsolberg

They really meant it when they said forget everything you new about (LDT) or other apps; didn't they?

 

One thing that I have adopted and has been working for me is compartmentalize grading. I no longer look for the finished product from one tool or one pass of a grading app, but start off thinking in very general terms and refine as I go.

 

If you set out setting final grades in your first pass you are only setting yourself up for disappointment. Look at it like a big block and chisel away small pieces at a time.

Thank you

Joseph D. Bouza, P.E. (one of 'THOSE' People)

HP Z210 Workstation
Intel Xeon CPU E31240 @ 3.30 Hz
12 GB Ram


Note: Its all Resistentialism, so keep calm and carry on

64 Bit Win10 OS

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