AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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fcernst
Posts: 1,104
Registered: ‎01-07-2011
Message 11 of 24 (541 Views)

Re: Smarter Corridors for Stream Restoration

10-31-2013 11:12 AM in reply to: tenmaryjan

Yes this is very clean and simple. This consists of one Corridor, one Region and one Assembly.

Fred Ernst, PE
C3D 2015
Ernst Engineering
www.ernstengineering.com
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tenmaryjan
Posts: 15
Registered: ‎04-20-2011
Message 12 of 24 (528 Views)

Re: Smarter Corridors for Stream Restoration

10-31-2013 11:46 AM in reply to: fcernst

Well that is great news. But what type of Assembly did you use to achieve this result?

 

If I were to guess, I'd say you are using 3 Baselines and one Assembly consisting of a single Marked Point for each of these Baselines. The Corridor Surface is than built using Point Codes. 

 

Am I correct?

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jmayo
Posts: 2,872
Registered: ‎11-13-2006
Message 13 of 24 (517 Views)

Re: Smarter Corridors for Stream Restoration

10-31-2013 12:21 PM in reply to: tenmaryjan

That's my guess too but i also believe he might also be using an offset in the assembly for the banks to get perpindicular lines from CL to bank or vice versa. Not sure Fred only shows the tin surface and the cor FLines. That works pretty well as long as the bank doesn't expand to a lagoon or pond scenerio where parallel offset banks will exist.

John Mayo, PE
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sboon
Posts: 2,133
Registered: ‎11-08-2005
Message 14 of 24 (484 Views)

Re: Smarter Corridors for Stream Restoration

10-31-2013 08:39 PM in reply to: jmayo

Here's my attempt at this.  I don't do this type of design normally, so my approach may be a little unusual.

 

Rather than using an alignment that winds around following the channel centerline I built one that approximates the middle of the proposed drainage and then used polylines and two profiles to define the channel bottom, the waterline, and the slope up to existing ground.

 


Clipboard01.png

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Neilw
Posts: 2,261
Registered: ‎09-04-2006
Message 15 of 24 (448 Views)

Re: Smarter Corridors for Stream Restoration

11-01-2013 08:16 AM in reply to: fcernst

I would expect very similar results if you generate featurelines from the alignments and used infills Fred. Have you considered that? The reason for using infills vs. just adding them as break lines is the triangulation should be more consistent between the bottom and top FL's. With breaklines the triangles would tend to form across the convex arcs. One downside is you'd have to close the ends of the FL's.


Not to say the corridor is not a good solution. Yours is remarkably well formed. Would you be willing to post your file for analysis?

 

With regard to splines and Civil 3D, it is important to note that splines cannot be used as breaklines but only as contours. At least that is the case through 2013.

Neil Wilson (a.k.a. neilw)
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Neilw
Posts: 2,261
Registered: ‎09-04-2006
Message 16 of 24 (444 Views)

Re: Smarter Corridors for Stream Restoration

11-01-2013 08:38 AM in reply to: sboon

I'm looking at Steve's corridor vs. Fred's. The two approaches provide significantly different results. The slopes on Steve's tend to be orthogonal to the baseline whereas Fred's are more radial. This raises the question, which is the more "proper" result? How should slopes be measured in a scenario like this?

Neil Wilson (a.k.a. neilw)
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sboon
Posts: 2,133
Registered: ‎11-08-2005
Message 17 of 24 (435 Views)

Re: Smarter Corridors for Stream Restoration

11-01-2013 09:03 AM in reply to: Neilw

It may be that the difference in slopes is caused by the fact that Fred is using three breaklines across the surface where I am using six, and mine are somewhat more parallel.

 

Steve
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Neilw
Posts: 2,261
Registered: ‎09-04-2006
Message 18 of 24 (428 Views)

Re: Smarter Corridors for Stream Restoration

11-01-2013 09:45 AM in reply to: sboon

Regardless of how the corridor is configured, I think the end result needs to be considered. What method will give the closest approximation to what will be built?

Neil Wilson (a.k.a. neilw)
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tenmaryjan
Posts: 15
Registered: ‎04-20-2011
Message 19 of 24 (393 Views)

Re: Smarter Corridors for Stream Restoration

11-02-2013 07:25 AM in reply to: sboon

Hi Steve,

 

thanks for your example. For a moment I thought you have just found a perfect solution to my problem. What I couldn't figure out however, was how the approximate Alignment would know on which side of the proposed centerline of the stream it actually is. It turns out it just doesn't. That is why at stages, where the Alignment is at the wrong side of the centerline, the Subassemblies just target back to it, which obviously causes some problems.

Corridor Surface.jpg

 

I have exagerated the profile elevations in your file to make it more visible.

 

Mariusz

 

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sboon
Posts: 2,133
Registered: ‎11-08-2005
Message 20 of 24 (377 Views)

Re: Smarter Corridors for Stream Restoration

11-02-2013 12:21 PM in reply to: tenmaryjan

Try this one instead.  The problem was the links from the assembly insertion point to the bottom of channel points.  They work fine when the alignment is in the middle but when it isn't you get links running below the side slope.  The solution was to hide those first two links, then use a LinkToMarkedPoint to make the connection between the two channel bottom lines.

 

I haven't tried it yet, but it seems like you could combine this assembly with the techniques used for intersections and culdesac design to create side channels, dead ended back channels, pools and ponds etc.

 

Steve
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