AutoCAD Civil 3D :: Storage Calculations And Grading Tools
Jun 5, 2013
I built a containment dike using the grading functions in Autocad Civil 3D. I set up the feature lines at the top toes of the embankment and graded nicely down to the original dtm. I want to use user defined contour to get the interior storage from the original dtm up to a selected elevation within the containment dike. The containment dike forms an enclosed area. I know I could use infill and add a false bottom to the embankment surface (triangulation from bottom toe of embankment across to opposite embankment) but I want to check storage from original ground dtm.
Is there a workaround method to do this without creating infill? I know I need to get down to two surfaces to get a calculation.
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Dec 30, 2013
I have my original surface I created with my point file and break lines. I created a new surface and was able to determine how to create my grading at a 3:1 slope that stopped at the surface I created from the point files. From there I went back to my Grading Groups and selected the Automatic Surface Creation.
From there I don’t know if I have to selected the Volume Base Surface and selected the surface I am grating from or if I can simply create a volume tin surface selecting the new surface and the original point surface for comparison. How do I make sure the Volume I am getting include the volume from the grading slope?
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Feb 21, 2013
I'm trying to create a proposed grade surface using the grading tools. I drew the outline boundaryof the proposed surface as a closed polyline then created a feature line from it and assigned different elevations to it. When I try to select the feature line in order to create the grading, I get "THIS FEATURE OVERLAPS ITSELF AND CANNOT BE GRADED". What could be a possible reason for this?
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Mar 7, 2013
I have a Grading Plan that is getting increasingly unstable as time goes on... I used Grading creation tools to create 3:1 mounding for a stock pile that is on my site... there are a couple dozen mounds on the site for this stock pile...
My problem is when I go to edit any feature lines or Grading; the drawing just crashes and will not save my work... I ran an audit and it does not find anything... I need to get the grading done ASAP and this is a major hold up... Do I need to go back through and manual grade everything or is there a secret that I am missing?
I have read multiple forums on the matter with older version of Civil 3d... so this is to tell me that the problem has never been fixed with Autocad?
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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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Dec 13, 2012
I can't seem to confirm the discharge table that hydraflow produces in hydraflow hydragraphs. I think I understand the equation itself (it's been a while since I took hydraulics), but can't understand where I'm making my error (if I am). Normally I trust the stage/discharge curve that hydraflow produces, but the City Engineer is asking me to confirm the values by hand and show them on the plans. Is there a link to an detention pond example that shows how a curve (the outflow values) was generated (confirms the discharge table at various elevations)? The equation is on page 85 of the users manual.
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Dec 9, 2013
I have been asked to do volume calculations using Civil 3D for some concrete piles for a oil/survey company. I have done volume calculations for site and land development projects but nothing to do with concrete piles before. It also appears I am the only person with any Civil 3D back ground in the office. I did mention my experience with Civil 3D was limited but I was trying to expand it by looking for Civil 3D jobs and working through the 2012 Mastering AutoCAD Civil 3D book.
I am assuming doing volume calculations for concrete piles is quite different from doing volume calculations for grading plans. The company has been primary using AutoCAD Maps and doesn't have much set up for AutoCAD Civil 3D yet.
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Apr 4, 2013
I must monthly calculate quantities. So i have 3 surfaces, one is representing the original ground level and the other two the measurements on the end of the months. Between the measurements I calculated volume. But I want calculate the quantities what is inside of the original ground level, what is outside that I want to exclude from the calculations. There is a way how to crop that surfaces to match with the original ground level?
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Aug 24, 2012
Any way for Vol. calcualtions to be shown in Acre Feet? I am doing Volums of lakes and the client needs a report of the number of Acre Feet in the lake. To get the data, he uses a depth finder hooked up to a GPS. I can do this by hand calculator but using Civil 3D 2013 would be much easier.
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Jan 17, 2013
I have learned the hard way that Civil 3D has a Curve Tolerance value that is to be used when applying sample lines and computing average end cross section volume calculations along an alignment with a curve. How I discovered this was by double checking my self and using a straight alignment verses an alignment with a curve. When using the alignment with a curve the average end cross section volumes differ. I did some reading in Autocad help and it mentions that sometimes a curve tolerance value is needed when using curves and this value is changed in the compute or edit materials window. What is a curve tolerance?" The edit materials window prompts a user to enter a Degree value. How do I calculate this curve tolerance value? I assume it is related to one of the values of a curve.
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Feb 13, 2012
What I would like to do is create volume calculations from spot heights. All i have is 4 rectangles with a 10m interval, nine elevations, no points or anything else.
What steps do i have to go through to make this possible?
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Aug 30, 2012
I am working on a project, I was given a file with the contour already mapped out. I am tasked with finding volume of a fill I had to create. I made a 3-D polyline at the elevation I want my fill to start from and going down to my final grade. How can I make surfaces with my map. I do not have any files to make the surface off of. What is the easiest way I can make a layer, TIN has already been done but no surfaces are in the file.
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Dec 18, 2012
Is it possible to ask Photoshop to save TIFF images using tile internal storage rather than strip storage? A little-known setting, a registry patch perhaps?
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Dec 5, 2013
A way to edit the Stage Storage table output? I'm trying to figure out a way to have the table output default to acre-feet in lieu of cubic-feet as well as omit some of the cells that are generated by default.
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Mar 28, 2013
What would be the best way to create a stage storage report with a basin that has multiple depressions and high points in the bottom of the basin?
The stage storage report seems to calculate these features as an addition when it should be subtracting for high points.
Could I do a bounded volume and set the datum to each increment of storage? How accurate is that? If it's accurate, is there a way do generate multiple at a time instead of typing D then setting the datum, then repeating that process over and over?
The only way that seems the most accurate is to create multiple planes at different increments, add those to seperate surfaces, then a volume surface for each one comparing it to the basin. This method takes up a ton of time, especially when dealing with 50+ increments.
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May 8, 2012
I see Civil3D has a Stage-Storage curve for determining volumes for incremental elevation increases for a bounded area (e.g. pond). This works well for water where the top surface is horizontal, however, i need to consider a sloping surface to duplicate a slurry discharged into a lagoon. This has a slope of 1% from the point of discharge and how i can determine the volume/height relationship considering this slope without having to do multiple grading and surface creation. The discharge point gradually moves upstream as the filling occurs to prevent the pipe becoming blocked by the slurry.
I thought about creating a 1% surface and incrementally raising it making it a comparison surface, but the 1% slope is not in a planar form, it is 1% from the discharge point in a radial direction.
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Jul 21, 2011
I have a small site where i've essentially designed a storage pond. I've cut 3.0m off the original ground at a 2:1 slope and built a berm at a 2:1 fill slope to a designed elevation. I've managed to balance the site to zero. The contour drawing I have shows elevations - which is great - however the client has asked to see the contours showing a Fill or Cut label from the original ground.
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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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Nov 1, 2012
I'm trying to create a stage-storage table with six closed 2D polylines. They highlight when I select them, but nothing is loading in the Table?
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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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