AutoCAD Civil 3D :: Calculate Catchment Areas
May 1, 2013
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.
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Apr 17, 2012
I have a question: ¿Which scientific calculation's method usually autocad utilize to calculate areas?
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Jul 10, 2006
I need to calculate the areas within a set of lines that form a closed area.
1. How do I do that?
2. Do I need to create a polyline around the area, or is lines enough?
I use AutoCad Map 2000i
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Nov 15, 2012
I wish to have the ability to define runoff coefficient regions of a surface (using parcels, closed polylines, aecpolygons, mpolygons, etc...) such that when a catchment area is created, the weighted runoff coefficient is calculated. For a corridor surface, the runoff coefficient can be specified by the link code used to define the surface (defined in the code set style).
These surface coefficients should continue through pasting operations, i.e. a final design surface should have the runoff coefficents from the various corridor and grading surfaces used to define it.
Currently, I have to manually calculate the weighted runoff coefficient by first determining grass, aphalt, roof, areas per each catchment area.
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Sep 13, 2012
Can you create Catchment Objects from the API or how to update the SSA file to include your catchment data?
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Mar 6, 2003
I have a drawing which contains about 100 "areas". These areas are closed polylines. I would like to get a total area of all these polylines.
I have tried using AutoCAD 2002's AREA command, but I am only able to select one item at a time, (AREA, Add, Object). This is fine for calculating a few areas. It gives me a running total of each item that I select.
Using the LIST command works OK for a few items, but you still have to wade through all the other information to get the area info for each item.
Is there a way to select crossing ALL the areas that I have, and have it return a total?
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Jul 10, 2009
I've been trying to calculate large areas using fills but I keep encountering a problem with some of the hatches not showing an area and thus ruining my calculation. I've found out that I can correct it by removing certain crossing point between lines as is shown below in my screenshots. Is there any reason this is causing a particular problem and can I avoid it to save me having to go back over my hatches checking for these malformed hatches?
area.jpg
altered.jpg
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Jun 22, 2011
I am working on basin areas for a very large project area When I use the catchment option, it will give me the immediate area around the point I have selected sometimes no more than a acre, and it is obvious that the contributing area extends well beyond the lines of the catchment area. Is there a way to adjust the catchment area to a minimum size so it will look beyond the immediate contribution and search for the actual basin area, or am I just wishing/dreaming?
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Apr 3, 2013
I have an urgent need to calculate the foam fill inbetween two slabs on different planes. Also, the foam will come in 4x8' pieces. I am fairly good at family creation but am a little perplexed as how to start this one.
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May 19, 2012
I don't know about open traverse...how to do open traverse and how to adjust it.
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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.
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Dec 14, 2013
I am trying to find out a good way to calculate hours minutes seconds , know a good program I can use on my phone. I am trying to add
35:42:16+17:53:57
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Feb 5, 2013
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.
Windows 7 64-bit
Intel Core i7-3840QM 2.80GHz
NVIDIA Geforce GTX 680M 4GB
16GB RAM
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Mar 5, 2013
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 ..
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Aug 9, 2013
How to calculate the lengths of the first and write each profile..In Part 2, I calculate the total length of ground.
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Oct 11, 2013
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...
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Jun 15, 2012
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?
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Feb 14, 2013
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,
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Nov 9, 2013
Calculating stripping using a corridor.
All we have is an alignment and a surface. In one region we need to calculate the stripping that is 6m wide x 1m deep.
I used LinkOffsetOnSurface to get the surface elevation on the left and right side.
I then tried using the stripping subassemblies but no luck.
because we have a number of regions and assemblies we would rather use corridors than creating a stripping surface.
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Aug 15, 2011
I have a drawing (autocad 2011) ,which i have to measure the areas of the many rooms and i arrange these areas in a table! is there any fast way to do so? avoiding the boaring typical area measurements room by room?
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Sep 18, 2012
How to calculate in a table the volume of cut and fill between the stations, The horizontal and vertical alignments are generated along with their sections. I’m wondering if there is a tool that summarize the volume of cut and fill between the stations in a table.
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Mar 4, 2013
What is the formula used to find the value civil3d pave, base and subbase? Value of what is needed to calculate it? what parameter values obtained from the lane and shoulders?
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Sep 5, 2012
I’m using 2011, due to printing issues in 2013. My question relates to determining how runoff gets diverted, or spreads out, after leaving a well defined channel.
I have a street intersection scenario. It’s a “Y” situation in which the main trunk of the “Y” is curbed and contains all the water for the three storms I’m studying. Runoff flows towards the two streets that branch off. I need to know what percentage of runoff water splits during the 2-, 10-, and 100-year storms from the main (curbed) roadway to the other two streets - one curbed, one uncurbed.
I assume that velocity, runoff volume, storm intensity, street cross sections, slopes, and other variables play a big role in how the water diverts, but I’m not sure how to set up this scenario in SSA. Do I somehow use a weir? Do I use an open channel, or user-defined channel? I have a subbasin area defined with my concentration point at the end of my main curbed street before the water splits off. I’m not sure where to go from here when it comes to inserting links, weirs, channels, etc.
how I can set this up? I’m not even sure it’s possible to have the software provide this type of calculation.
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Mar 17, 2009
I have a few questions regarding spread/street capacity:
When calculating the spread at the catch basin locations, how does it determine the curb height?? Does it always assume 6"?? what if it is a roll curb??? is it olnly determined by the "throat height" of the inlet?? How can I calculate my spread on random spots throughout the street??
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Dec 7, 2012
How can I perform head loss calculations with the new pressure network feature in C3D?
I would like to use C3D 2013 to calculate water distribution networks... Is it possible or should I export to EpaNEt?
Autocad Civil 3D 2013 - Infrastructure Design Suite
Windows 7 64 i7 860 @2.80GHz 8GB Ram Quadro 2000D
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Aug 6, 2012
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.
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Dec 16, 2013
I was just wondering why when I try and calculate an area using a polyine, I am getting a readout of 1.80401967E+07, when I have it set to give me the calculation in square feet? It is an area of approx. 246 Acres.....is this because the area is so large? I am not sure what the "E" stands for or the "+07" at the end....
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Aug 18, 2013
How to calculate the AREA of cut and fill analogous to the volume of cut and fill between surfaces, but instead only between the alignment and the road profile in the prolfile view. From what I've read of similar posts a few people have had the same question but have been instructed how to do it with volumes as opposed to area. Also how to insert a table of cut and fill area analogous to the one you can inset from the volumes dashboard.
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May 25, 2013
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.
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Jul 13, 2013
I'm working on a windfarm access road (5m wide with widening at bends to 8m) and I need to identify the areas of widening.
I've got the centreline alignment and created the 2.5m offsets to each side. I have also created widening on the insides of the bends using the widening tools and used a linear taper at entry and exit. I now need to hatch up the portions where the road has been widened to demonstrate compliance with the specification and the only easy way I can see is to export to autocad and use the hatch tools (not tried to hatch between alignments).
Whilst this works it isn't dynamic so if the alignment is adjusted the widening alignments are also moved but the hatching remains.
IDSP Premium 2014 (mainly Civil 3D 2014 UKIE SP1 & Infraworks with some limited 3ds Max Design)
Win 7 Pro x64, 256Gb SSD, 300Gb 15,000 rpm HDD
16Gb Ram Intel Xeon CPU E5-1607 0 @ 3.00GHz (4 CPUs), ~3.0GHz
NVIDIA Quadro 4000, Dual 27" Monitor, Dell T3600
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Aug 1, 2013
I have a bunch of polylines I want to display the areas for. I am using mtext and fields. However the fields format part always defaults to a less than desirable format. Is there a way to set the formatting how I want it for the entire file? Or is there a better way of labeling than fields?
Civil 3D 2012 SP4.0 Windows 7 Enterprise 64-bit
C3D 2014 SP1
Dell M6600, Core i7 @ 2.3GHz, 16 GB ram
Dell T3500 workstation, too much ram to post
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