AutoCAD Civil 3D :: Merging Surfaces Connecting Grading
Apr 25, 2013
As you can see in my attachment, I have a emergency spillway coming out of a dugout wetland. The fill area, the pool area, and the emergency spillway channel are all separate surfaces. All three of these surfaces are created from gradings. The fill was a feature line drawn around the top witdth of the dam, and then graded down to the Existing Ground. The channel is another polygon feature line with elevations at each PI and then graded up to the EG. The pool was a feature line I drew around the perimeter of my pool, laid on the surface EG, and then graded down to an elevation on a slope.
I'd really like to blend all the surfaces together. Right now, they are all separated with tiny slivers of Existing Ground.
How do I go about this? As you can see, I'm still pretty green with gradings.
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Jun 8, 2012
I started with a points file which I created an existing surface called EG. I then used a number of feature line to create the gradings, grading surfaces and associated volume surfaces (compared to EG) also had other drawing elements and aerial photo in place. I had a lot of grading scenarios to do and it was all in one file. It was getting out of hand, so I duplicated the file, deleted the gradings (retained the EG surface) then added another set of new gradings and volume surfaces against EG. I did this in 4 files. So now I have multiple files that contain duplicates of the same EG surface and other features, but have unique gradings and surfaces referenced to those individual EGs.
Files all have similar structure:
+Various features (duplicated in all files)
- base aerial photo
- other drawing elements
+Surfaces
- EG surface (duplicated in all files)
- Grading A-1 surface
- Grading A-2 surface
- Grading A-1 volume surface
- Grading A-2 volume surface
+Site A
- Grading A-1
- Grading A-2
I recognise now that I should have data shared the EG surface from 1 file (and xrefed the other common drawing elements??) but given my situation now, what is the recommend way of putting it all together?
Civil3D 2013 (infrastructure suite) ANZ & UKIE
Self-built i7-3930K, 16Gb RAM, P9X79 m/board
SSD(system), HDD(data), GTX680, Win7Pro64
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Mar 3, 2013
I created a grading and a surface for a pond that is abotu 30' away from a roaway that has a seperate surface. What would be the best way to connect the two surfaces? I need a uniform slope from the edge of pavement to the top of berm of the pond.
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Oct 3, 2013
I'm currently trying to model all siteworks for a project using Civil 3D 2014. I created several grading groups that represent the various pads I need for the general project layout. Since this was the way I knew how to model the pads, now I have some intersections on the slopes between one grading group and the other. I was wondering if I could "merge" the grading groups in order for them to be just one big pad, that maintains all the levels from the other pads. Here is an image of what I am trying to explain:
What I want to do is to merge the regions circled in red, so that I have only one building pad on my terrain.
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May 30, 2012
I have an existing topo surface created as well as grading for a proposed elevated pad of earth done in civil 3d 2013. I simply want to calculate the cut and fill quantities. I created the grading with automatic surface creation checked on. When I use volume tools to see what the quantities are, it says 0.0 for both cut and fill.
I created another surface (TIN) and pasted the existing topo surface and the proposed grading surface into it and I couldn't get any quantities.
I created another surface (TIN volume) and set the base surface as the existing surface and the comparison surface as the surface created from the grading but again could get no quantities.
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Jul 8, 2013
I have created several pond embankments using the grading tools and have created surfaces using the grading groups. The problem I am having is when I turn on the triangles for one surface, I get the triangles for all the embankments and EG. The software keeps adding to the EG and doesn't cut out each embankment. I know I'm missing a step but I'm unable to find it.
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Oct 13, 2013
I am trying to create a surface using the grading tool. I have a known top and a designed floor. I extended the floor surface out to meet the top breakline. I then use the grading tool to run a 3:1 down to the pond floor so I know where the true breakline is, but there is almost always a gap or two in my surface. It is usually less than a foot, but it has made my OCD kick in and I am going crazy trying to figure it out. I've traced of the breaklines, and the contours and added them to the surface to try and fix it, but that doesn't seem to work.
AutoCAD Civil 3D 2012 SP4
Windows 7 (64)
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Dec 11, 2012
How do I merge 2 corridor surfaces that are running parallel to each other. Due to this being an overlay project the CL will stay the same just raised 4.5" from existing CL and the existing cross slope varies which we are matching until you hit the sawcut. We are not ripping out or milling any apshalt, it is strictly an overlay of the exisitng with 4.5" of new asphalt. We are saw cutting 2' either side of theedge of paveement and matching in with proposed.
I have created a feature line over the existing cl then raised it the required height. the cl has been offset 10 both sides to create my left and right shoulder alignments, I then created a left and right shoulder corridor assembly which has supplied 2 seperate surfaces. I now would like to merge the 2 surfaces using the raised cl feature line as a break line to create the final proposed surface. I would prefer not to have to create feature lines from my corridor and create a new surface because i would like to take asphalt and subgrade quantaties at the end with out having to hand calc but will if need be.
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Dec 24, 2013
"An infill grading has no criteria applied to it. Any area bounded by feature lines or lot lines that is not already a grading can be converted to an infill grading."
So given an area enclosed by a feature line, an infill grading can be created. Using the same features line, an feature line grading can also be created. what is the difference between these two surfaces? They both have no criteria applied to them.
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Aug 6, 2013
I keep having my corridor connect to 0,0,0 in only some areas. What Is making civil 3d do this?
Civil 3D 2012 SP3
Civil 3D 2012 SP3
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Nov 7, 2013
I have a HEC RAS model which I ran a steady flow simulation on, and then I tried to use the GIS Export button to get a .sdf file. When I tried to connect to the .sdf file in Civil 3D, I got these errors:
Failed to connect.
Failed to open FDO connection.
File is not an SDF file, or is an SDF file with an unsupported version.
An error occurred during SDF database access.
I played around with the settings I chose when I exported in HEC RAS and couldn't get any different results.
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May 9, 2012
Is there an easy way to raise an entire site by 1.0 foot and have the grading hit the previous targeted surface? The only way I have found is to grab all the feature lines and raise them up by the required amount, but by doing that, the grading bogs down my system and it crashes, plus, I have grading attached to 3dpoly's and not necessarily all feature lines.
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Apr 25, 2013
I am drawing a pond levy. I draw the outline of the top of the fill, set that at the elevation I want, then grade it down to the existing surface on a 6:1. The grading works perfectly. The outline of the fill's footprint shows up just fine around the back of the fill, but the toe line doesn't show up all along the front side of the fill, but I still get the slope lines projecting down in the front.
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Mar 6, 2012
I want to cut a channel through a existing surface; bottom width: 5 feet; at elevation 1950 and side slope 1:1 (45deg) up to existing ground.
What I am doing right now is create a feature lines 5 feet wide, at el 1950 and use grading tool to project it to existing ground with side slope at 1:1. What i am doing is correct?
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Oct 16, 2013
I am working with Civil 3D 2014, I played with 2009 back in 2008 and before that it was Land desktop. I don't know if I am not following a standard workflow.
Build the EG from contours.Layout the CL for the ROW and convert to a horizontal alignments.Create the profiles.Design the vertical alignment in the profile.Create the assemblies for the different types of road sections.Full profile, pavement width assembly, the curb return assembly, the daylight left / right, 1/2 side left / right, and pavement width left / right.Build the corridor, set the target surface as EG or FG, depending on where the section of the corridor is located. (At the edge of the property to EG, then after the first building pad to FG)This is where I have a thought something is wrong. If I am grading the entire site, why would I have the ROW grade to the EG, when I will need the surface to grade from the ROW to the closest building pads?Create the intersections, using the different types of assemblies, per the ROW sections.Create feature lines and use elevation editor to set all the elevations around the pad.Using the Grading creation tool, grade to surface, using a 2:1 side slope. Then adding an infill to the pad.
I keep having the file crash after grading about 10 lots. I recover and it works find, but then the file runs very slow, and will crash. I haven't taken any classes in Civil 3d, and am looking for one in my area.
I am use to creating the vertical surface then creating points along the CL, TBC, FL, BOW then creating break lines along the points. Then create a break line for the pads, and build the FG contours from these break lines.
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Aug 8, 2012
Say I have a grading that runs north south and goes down 2%, up 2% and so on waffling along. Is it a poor practice to trace the side edge of the grading (in the same site) to add another grading to pitch east west?
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Mar 4, 2013
I have a building pad where I created a grading of 5:1 to existing grade. I want to change one side to 20:1. How do I go about transitioning the 5:1 to the 20:1. I create the 20:1 and the contours just dead end into the 5:1 grading area
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Dec 31, 2013
I tried to work with grading but it didn't work,
1 - The square helicopter pad is flat and grading with 2:1 fill, 1:1 cut.
2- The second FL is 2% slope down and grading with 2:1 fill, 1:1 cut.
3- The third FL is slope down to meet the existing road, both sides will same cut and fill.
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Dec 30, 2013
I am creating a helicopter pad, with cut slope 1:1 and fill 2:1. But when i created a transition between the pad and existing road, i don't know how to. I have added a feature lines and make a separate grading but somehow it didn't work.
I have attached here the dwg file (C3D 2014) .
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Mar 19, 2013
What does "Residential grading display" mean?
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Sep 8, 2012
I have a platform at level 13.275m and nearby there is a retaining wall at aprox. level 4.0m.
For the wall i've made a surface using feature lines from EG till level 15.0m and then pasted into the EG surface to create the 'barrier' for the slope. But when i do the grading with the fill slope projection to surface, when it reaches the retaining wall section, the contour lines go crazy and if i do a quick profile, the fill slope line (obvious) is iregular, rather than a straight down line (2:1) going from level 13.275m till it hits the EG.
I've attached a picture to show the problem better.
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May 21, 2012
I am tring to grade a complex object. Please see the attached document. The two grading objects are not interfacing correctly when graded although i can get the surface almost correct i beleive. Is there a way to remove this issue or the grading will not create a lot of difference when computing the volume clacs ( we are talking volum computation roughly about a million cubic metres cutting).
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Aug 29, 2012
I have noticed that the value I get when I use the surface volume comparison tool or look at a graded item in the grading group properties box is different than if I calculate it by hand and the discrepancy isn't even consistant. After spotting this problem in a job I am working on graded two simple ponds to check this. The first one is 100' x 100' and 5' deep w/ 2:1 side slopes. Calculating the volume by hand I get 1500 cu. yds but the grading group properties come up to 1506.17 cu. yds. The accuracy is off by less than 0.5% The second pond is 100' x 100' and 2' deep with 3:1 side slopes. The hand calc gets me 654.52 cu. yds. and the grading group properties reads 655 cu. yds. This discrepancy is closer to 7%. I really need to know if I can trust the volume tools in the program.
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Apr 24, 2013
I have a compost pad and retention pond to design, I set my back Pad line to surface and then graded to elevation so the slope to the pond will have no cuts
I created a pond and left out the grading to surface on the up hill side towards the pad which will be paved one day. I now created two side feature lines to enclose the whole pad and graded by distance and slope.
My problem now is the two side and back seem to blend together as I attached the feature lines together but I can not figure out how to blend into the pond create as it has side slopes to EG and the front which must join to the side slope crest to enclose the pad to drain into the pond.
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Jun 10, 2011
can i make grading between two features lines.
i want to make a slope from FEATURE LINE 1(FL1) TO FEATURE LINE 2 (FL2)
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Jun 20, 2013
It has been too long since I created Grading Objects and Proposed Surfaces. I am working in a file with my existing surface DATA Linked. I am creating a grading plan. I have created three separate grading objects in the Site named Proposed. One in the building, One is a new ditch, one is a graded existing ditch. I need to make these three with the unaffected areas of the existing surface into a new surface. How do I accomplish that . All my grading objects appear to be individually accurate and are created with a Feature Line and Grade to Surface Styles.
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Dec 20, 2012
1 Do I create feature lines at toe , then vertical between the toe and the cliff , then use the grading & elev.editor
2 Once I obtain the infill surface l, how rotate or orient the model w/ rocks so this photo 3 is draped over it.?
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Jun 18, 2012
I am having difficulty projecting an existing feature line at a specified tie-in slope. I have a steep (3:1) feature line that I need to project at a specific slope (2.5:1)to intersect a surface model. When I create the grading object the generated grading object is not 3:1 along the feature line and 2.5:1 perpendicular to the feature line. Instead I am left with a new slope that is 1.9:1 between the generated contours. I have attempted slope to surface as well as slope for a distance.My design criteria is to not exceed a 2.5:1 tie-in slope.
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Jul 19, 2013
I have two separate graded levees in my drawing. One has created a surface just fine, the other absolutely refuses to generate a surface. I've deleted the grading even the feature lines and re-did them. In my grading group I have automatic surface creation checked and the volume base surface checked. I show the surface in the prospector but there is nothing there. The one levee will show contour styles but this one ZIP!
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Aug 1, 2012
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.
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Feb 27, 2013
I have this problem with EG covering over the cut area.
The feature line is partially under the surface making a cut.
It should be a hole where EG and the slopes meet as the image shows!
When I make an infill for the fill area it makes the the bottom of the cut area but the surface stays as a top!
It is very clear in Object viewer!
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