AutoCAD Civil 3D :: How To Calculate Average Slope
Feb 20, 2013
What formula Civil3D uses to calculate the average slope of a surface?
The formula I am using is S = I*L/A
S = Average Slope
I = Contour Invertval
L = Length of Contours (ft)
A = Area of parcel (sq. ft)
I just had to do four parcel calcs and the percentage I find using the formula is always 1-3% lower than the percentage Civil3D spits out. I can't find anything about how Civil3D arrives at that number, it just appears. I assume that Civil3D is more accurate but I can't give that number to a client without knowing how the program arrived there.
I have an acad document connected to some .shp files, which contain polygonal shapes with some meta-tags.
I want to achieve the following: draw a polygonal shape and select all the tangent areas (I already know how to do so)take a property of those areas and calculate an area-proportional [or: area weighted] average value (proportional to the partial area defined by the drawn polygonal shape). I tried to achieve this by splitting the objects and merging them again with defined splitting (area proportional) and merging (average) options. The problem is: splitting & merging doesn't work until I disconnect the data files (checking the objects out doesn't work) and even then I can't split the areas. And, more important: This doesn't create a weighted average and I don't even want to manipulate the objects! I just want to get one value out of all these steps.
I appended a screenshot of my file. E.g. I want to take the value 923.2 and multiply it with the corresponding area percentage it represents in the drawn shape. So the calculation would look something like 0.02*923.2 + 0.2*926 + 0.12*945,9 [...] until all the 100% are covered and I get one single representative value.
I use AutoCAD Civil 3D 2012 on an Intel Core i7, 12GB RAM, 64bit Win 7 Pro SP 1 PC.
I use Civil 3D 2011 and I am new to it. I have created a natural ground surface from survey points. Now i want to create a finished surface with a specific slope in a specific direction at a specific elevation and then to calculate cut and fill volume.
I can create a flat surface at a specific elevation. How to tilt this surface to a specific slope along a specific direction.
Can you not perform a slope-slope intercept to place a PVI? Essentially holding the sta and elev of the PVI's directly before and after the PVI of interest and changing the grade in and out so that the sta and elev of the PVI of interest are changed.
Can't figure out how to match gutter slope to outside lane super subassembly slope. Have super eop targeting a feature line with elevations, but when i check section editor gutter slope doesn't match pavement slope.
Civil3D 2013 Windows 7, 64 bit Intel i7 2600 @ 3.40Ghz 16 GB RAM Nvidia Quadro 600
i need a shoulder subassembly that varies slope in relation to the lane superelevation slope. i know that i can get a subassembly for the shoulder that will follow the alignment superelevation xml data but in my case i can't use it because we are just adding a shoulder to an existing road. we're not changing the superelevation of the existing road, just milling and overlaying and widening. right now i've created a profile of the outside edge of the shoulder that gives me the correct shoulder slope but whenever i change my centerline profile i have to redo the shoulder profiles which is a real time suck.
I am in the process of transitioning from land desktop to Civil 3D. I design roads in steep terrain and sometimes need to have my catch (daylight) slopes change. So my question is, how do I change a daylight slope at a specified depth? For example, from the shoulder of the road I want a 3:1 fill slope to a depth of 10 feet than change to a 2:1 slope until it catches the existing surface. Can this be built into a subassembly such that if the fill is less than 10 feet it will daylight correctly at a 3:1 and if the depth is greater than 10 feet then it carries the 3:1 for 10 vertical feet and then changes to the 2:1 until it daylights?
I have been able to undertake this with other software and have desperately tried to find this same function in Civil 3D .
Is there a command that returns the average level of any particular surface within a specified area, for instance if we have a generated a large surface and then draw a square in the middle of the surface, can it calculate the average level within the square only?
I have 2 different surveys of the same area of ground. If i create a surface from each data set, can they be averaged into one suface? I know you can past them together, but how does it paste? the first one on the bottom and the second on time? I would like an average.
Any quick way of calculating average Parcel Area? I used to export to LandXML and do an area report in CSV. That doesn't seem to be working for me when I export out of C3D 2012.
The workaround I found was to select all the parcels in Prospector, copy to clip board, paste in excel, find and replace "_Sq. Ft._" with 0, then do the average.
We have to compute the average elevation along the front, sides and rear of a proposed building envelope to calculate the required set back.
Right now I am setting FL with elevation nodes at the required interval, assigning EG elevation and pasting from the panorama to excel to compute the average.
Is there a way I could create a toolbox report to do this? Maybe even from a profile report?
HP Z210 Workstation Intel Xeon CPU E31240 @ 3.30 Hz 12 GB Ram 64 Bit Win7 OS
Trying to calculate a catchment area to allow me to size some culverts using Civil 3D 2012 Sp#1.
" The specified location results in a Catchment with no area."
After sitting for 15 miutes I keep getting the above message. The surface is huge and there is an obvious catchment area (or I think it is obvious). The surface was generated from contours and cover an area of approx. 8Km x6.5Km but the catchment ares should be around 15-20% of that area.
I tried another one upstream about a Km and it worked fine. So the one I am doing now should encompass the upstream area as well as from that point downstream to the Discharge Point.
The undefined areas of a slope map now have a hatch to them and are plotting black. This map was created a month ago in 2012 without issues, upgraded to 2014 and now the undefined range has hatch!
I have a simple driveway corridor along a steep hillside. For cut, I would like to have a negative slope away from the shoulder edge. I have tried numerous approaches and all 'cut' reverts to positive. I searched and found no clear answer. It's such a short driveway, I can 'fake' it in, but I would like to calculate quantities.
With reference to the picture attached, I am trying to find the overlapping area between two different cross-sections. I.e.the area of green minus the area of white.
The hard way to do it would be to sketch a closed polyline over the area I want but I have about 100 of these to do and more to come.
What is the formula used to find the value civil3d pave, base and subbase?
i have attachment material report, the three numbers marked in my attachment are the end areas calculated by the software. So, i want to know how those numbers are calculated .. manual calculated with formula ..
Is there a way to have C3D calculate your cut generated from a pipe network? I have a site with storm, sewer, and water lines. All of which are on 3 seperate pipe networks. I also have my finished grade surface established.
I know you can get the volume difference between two surfaces (EG&FG) but you would think you could do this for the pipe networks as well...
I am working on a project that requires me to calculate how much gravel I have to take out of a steep hillside when I am designing a route for a pipeline and a road. I is it possible to do this in Civil 3d and how can I do it?
I have a problem when calculating the volume of a design plan, the slope of the land, the design had to be made so as not to slide trap. How it makes grading a trap,
I've got a surface that displays contours correctly. When I go to Surface Properties-Analysis tab, I can set an arbitrary number of ranges for contours, directions, elevations, slope arrows, etc, and they display correctly.
I can set an arbitrary number of ranges in the slope range box too, but when I click the Analyze button, Civil 3D 2014 hotfix 1 only displays two slope ranges: 0% to 2979736.0077% and 2979736.0077% to 99999900.0001%. (!)
Can I automatically have my slope patterns introduced with a command like matchprop or something similar ?
I have 284 streets and it's getting ages to finish the slope patterns on every street. Civil Engineer / Infrastructure of metropolitan transports. URL....
I'm trying to match an existing slope design that has a soft rounded off top of slope. The toe (green) is a feature line and I'm using a 1-1/2:1 slope to natural surface grading rule. You can see the rounded contours in blue that I am trying to match.
in my link "link slope to surface", i have the slope set to -2.00%. in the cross sections, it is at a +2.00%. why is this thing not linking at the defined -2%? see image.
I need to project a surface/grading (or something of that nature) across my berm and have it intersect with the inside bank. This is better explained if you see the attached image. In the plan view you see 4 featurelines. Outside TOE, outside TOB, inside TOB then inside TOE. I need to project the outside TOE across the berm (shown in the section view) then create a new featureline where the line and inside slope of the berm intersect. Note that all the elevation shots vary as does the widths across the berm. What's the best way to do this?
