AutoCAD Civil 3D :: Culvert Modeling - Peak Flows Are Artificially High
Aug 14, 2013
I am having difficulties modeling culverts within my model for the 100 year flow. I have seen the sample file within SAS, and all of my culverts have a storage node at the upstream end with a weir representing the road. However, when the weir is utilized, peak flows are artificially high. For example, despite a basin only producing 11.7 cfs, the weir has 8.94 cfs and the pipe has 10.35 cfs. I am using hydrodynamic routing with a 5 second routing time step.
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Mar 27, 2012
We are starting a new job, and looking how to setup our drawings. We have a long corridor that we are upgrading, and along this corridor, we have various water course passing through. We are replacing the existing culverts. They are large circular culverts. How do we show the culverts on our model? Do I create a short pipe network for each culvert crossing? And also, how do I daylight to the outside of the culvert as the corridor crosses over it?
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Mar 2, 2012
I am modeling an existing storm system that is under capacity. After running the model, some of the flows seem to be incorrect. I have one section that has a known flow of 1.31 cfs. The results for this pipe section shows 28.82 cfs (peak flow during analysis) and 6.06 cfs (design flow capacity). The pipe section is a 15" with constructed slope of 0.0088 ft/ft. The max velocity attained is 23.48 ft/sec. I know that the downstream is undersized. Could this flow rate be caused by the downstream backflows? The model is setup as hydrodynamic and rational method. My inertial terms are set at ignore, time step = 0, junction surface area = 0 and variable time step with safety factor 75%. I have gutter bypass flows and my sag structures have ponded area set at 100.
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Nov 9, 2012
we are missing tool in SAC for stripping a surface exactly the same way how Stripping Pavement or Striping TopSoil works. There is no tool to copy and vertical offset part of the surface. I found out some workaround with Point Delta X on Surface and then vertical Offset, but this is very complicated and I am not able to follow each peak of the surface. Surface link is not suitable for Topsoil stripping.
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May 7, 2013
In Land Desktop using the Hydrology tools, we could get capacities for rectangular pipes based on slope, size, etc.
I have tried using the Hydraflow Express tools for this, but cannot figure out how to use them for a RECTANGULAR pipe (i.e. 10x4) box. Saw the circular option, but couldn't change where it says circular.
This is not a culvert analysis because we have inlets, multiple slopes, etc. It is part of an entire system.
I use these tools to layout the system before I want to put it into the analyses software we are using.
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Oct 9, 2012
I am wanting to get the peak flow back into Civil3d to add to our long sections, I assume the Peak Flow in SSA is the Flow rate property for the pipe in Civil3d, the HGL stuff seems to come in ok. I am just doing a basic rational analysis in SSA is there a trick to getting the data?
Attached is a screen capture of SSA versus Civil3d data
[URL].......
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Jan 15, 2013
I am currently working on a culvert drawing, using two view ports for my plan and profile sheet. As you can see below in my attachment, the UCS icon in the upper viewport is distorted, I do not how this occurred nor do I know how to correct it.
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Nov 7, 2013
New user for civil 3d and the hydraflow extension for civil 3d. I have my pipe network created, all the correct catchments are attached to the correct basin/inlet. i have opened my network in hydraflow and am ready to run it. when I click run it says no flow. Now I know there is another step i need to set my flow wth TOC, I've inputted that, i am using the standard idf curve hydraflow, i have the areas with their coefficients, however it is not calculating my flow rather it is telling me no flow is inputted for certain lines i.e. the ones with MH connections and no inlets.
I have attached my .stm file to this thread, i changed the extension so it would post, just delete the .doc from the extension and it should work in your hydraflow.
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Jan 2, 2013
Attached is my 1st project using SSA for detention pond design.
Where is the best place to view the results for the detention pond peak outflow and maximum HGL?
Also, the program seems to separate the results per year storm...anyway to view the results for all year storms in the same report?
how do you attach the .spf file?
2013 Civil 3D
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Jan 3, 2013
I need to model a diversion manhole in a storm sewer system. The diversion will take X cfs from the system and send it to a water quality treatment facility. After leaving the WQ facility, it will be returned to the storm sewer system at the next manhole downstream.
I tried in Hydraflow but it doesn't look like diversions are possible. Thought about modeling up to the diversion manhole and taking that data into some other program, and then coming back into a second Hydraflow model that handles the downstream bit.
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Dec 12, 2012
I have a master plan development that I am trying to model different wastewater flows scenerios for I am basically following this paper from AU 2011 [URL] but have a couple of issues I am trying to work around.
Basically I want to take a spreadsheet of flows determined for specific nodes and upload it into SSA quickly from the paper
I can see that you can write a shp file of the network and then add different flow scenerios to the .dbf file and them use the GIS import function of SSA to get the flows assigned in one hit.
The issue I have however is that my network is a prelimary design in Civil3d as pipes and structures and if I create a .sdf of the network and then.shps from that data I do not get the structure sump elevations, this is not something that created in the shp file export process,
To work around this I through maybe I could export the network from Cicil3d to SAA which gies me all the strucutres with the correct sump levels and then also create a .shp and .dbf file and add the flows and them do a GIS import of just the structures and merge them with the exisiting network as the structure names as exactly the same and therefore the gis import should find the correct structures.
However SSA does not and adds a second lot of nodes with the same structure name but with Junction in the front.
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Dec 16, 2013
I was modeling a unicorn in ZBrush (because it's so comfortable and intuitive with modeling) for a film in a project of my studies and imported it to 3ds Max then, because I know how to rig and animate there (and in ZBrush I didn't even find out how to MOVE an object).
After a while I finally killed all the triangles in my mesh, but it's just... horrible. So many polys where they aren't needed, so unclean. It looks like this:
[URL]..........
And I'd rather want it to be clean like that:
[URL].......
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Aug 15, 2012
It's not unsual, when taking photos that include the sun, where the sun is partially obstructed by tree leaves, the edge of a building, or other such things, that the resulting image shows sharp spikes shooting out from the perimiter of the sun. I'm trying to learn how to create those in photoshop when they don't show up in photos where I want them to show. I'm using CS6. I've learned how to do Sun rays, but these are different.
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Oct 28, 2011
I'm having trouble with a high poly model. It's too big for my system right now to use in a complex scene, so I want to use a MR proxy to instance it. However the model I have(I wasn't the modeler) is composed of a lot of objects, more than I'm willing to make a proxy for. I tried to make a group out of them and make that a proxy but that doesn't seem to be possible (MR proxies can only store 1 object?)
So my next step was to combine them into one object via attach, however when I do that the smoothing gets really screwed up (see attached jpgs). Any tips for keeping smoothing per object as I add them?
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Apr 3, 2011
What i have is a low polymodel that's quite small in scale, i'm modelling around a higher poly model, when i zoom in, the viewport clipping kicks in and parts of the model disappear, so i cant work on the small details. What i need to do is scale up both my low poly and high poly, work on the small details and scale it back down.
In maya there are multiple solutions to this; The first and most obvious would be to increase the near clip in the camera attributes.
The second would be to freeze transformations on the low and high poly, scale up the model, work on it and then scale it back to the value of 1.
The third would be to put both the low and high poly models into a group, scale up the group, work on the model, return the group back to its default size and ungrouping. Personally i would use this method to preserve the original scale values on the low and high poly models.
Is there a way of doing any of the above in 3ds max?
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Feb 6, 2013
I work for an A/V company. We use AutoCAD LT 2013. We are looking for a program or a computer script to check our A/V Flow Diagrams and Conduit Riser to make sure that all cables are accounted for.
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Oct 18, 2013
I signed up for a trial awhile back but never did anything with it, so I have no trial offering available now.I am wondering how their high resolution image product looks in 20 to 30 scale viewports, if their high resolution image is rubber sheeted over a 25-30 acre townhome site.
I would want them to look less fuzzy and grainy than the USGS NED 1/3 meter images I tried. How does the curb and gutter and sidewalk look when used as an underlain to as-built survey linework at this scale?
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May 24, 2012
I have a client that is requesting a high resolution pdf for the purpose of sending to a graphic specialist to be made into a sign for a subdivision.
i am using civil 3d 2012 on windows 7, 64 bit.
using pdf995 and/or dwg to pdf as my driver, the only way i can get it to deliver a high-res graphic file is to have it produce an extremely tiny area, which, when blown up to the 4' x 8' size for the sign, gets even worse than the 72 dpi it gave me in the first place. Where i can get a driver to have autoCAD print a drawing to pdf at higher resolutions? Or, how to get autoCAD's default pdf creator to produce higher res?
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Feb 4, 2014
I'm working on a document with tables, and when I ask it to autoflow, using the Shift- Click, after the first table, the rest of the tables are on one page, with long cylindrical text boxes, instead of the pages with large textboxes on them.
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Feb 27, 2012
Is there a way to force the Low Point or High Point in a vertical curve to a specific and precise station?
I can do it with grips, but it's imprecise. In the project I am currently working on, I have some leeway regarding the slopes into and out of the vertical curve, so I have some flexibility, but some of the LPs and HPs need to precise.
Windows 7-64
8GB RAM
AutoCAD Civil 3D 2013
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Feb 12, 2013
When I import points from a survey database there is a very large new number being assigned to points that have overlap/numbering conflicts.
I had some survey from one source that was in the 1000 pt # range & additional survey that was in same numbering sequence.
When importing the points I chose "Resolve all" it is renumbering the Point number value to the 5xxxxxxxx range?
Is there some setting where I can change this to a lower # or how/why this is happening?
Next Point Number value @ Settings Tab>Point>Commands>CreatePoints>Point Identity>Next Point Number = 3.
I've attached a couple of captions illustrating the issue.
2012 Civil 3D SP 2.1
Win 7
C3D 2012 SP3 & C3D 2014 SP1
Win 7 Professional 64 Bit
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Nov 15, 2012
How do I show high level walkways and balconies (in dashed outline) on the ground floor plan in a high volume space?
Obviously I can turn the first floor RCP on in the view and manually draw the information, but I assume these lines won't move if the walkways above move (or am I wrong?). Also this seems slightly wrong given the amount of automation available.
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Jun 5, 2013
Is there a plugin that allows for creating right-angle flows...lines with arrow tips?
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Jun 8, 2013
I am trying to import photos from my computer to Photoshop elements 11. It has imported most but wont import some as "file quality is too high". How do I get around this? Do I have to downgrade the quality of my photos? To do editing wouldn't you want the best quality photos to start off with?
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Apr 10, 2012
I have a complex intersection of three corridors with:
- oblique angles
- different sections assemblies (one way and two ways - full section)
How should be the best approach to solve it?
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Nov 19, 2013
I'm modeling a hydro scheme access track about 4m wide that meanders down a steep hillside at 1:8 with a couple of hairpin bends where the gradient is 1:20, what is the best way to model this?I have got polylines to define the hairpin and also offset alignments but I need to ensure that the outside edge of the hairpin at entry is used as a level target for the inside edge on exit for the length of the hairpin.
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 17, 2012
Is it possible to add a custom object such as soil reinforcement to C3D? I have a roadway grading plan with cut/fill slopes that will require geosynthetic reinforcement. Is it possible to add reinforcement to the drawing and have C3D calculate quantities?
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Dec 2, 2013
I am preparing to model a road surface for a waterline project. I would like to be able to generate sections at desired stations showing the sewer, storm drains and joint utility trench along with the proposed water line. My plan is to model the road surface using a surface created from gradings and then create the pipe networks and joint trench.
My question is whether gradings or corridors would be the way to proceed. I have preliminary design data on the road surface which is sure to change.
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Mar 19, 2013
Any Earthen Causeway or Breakwater modeling using custom Assemblies and Subassemblies. Any tips or tricks before I get going ??
Structure would consist of a Core, an Underlayer, and of course Rip Rap. Also the Rip Rap layer will most likely have a Toe at the Existing Seabed.
The last time we did a Causeway, it was fairly complicated and I did it with Grading Objects. Edits and modifications were a real PITA. Also volumes were a little awkward to get. I figure using a custom built Assembly would be a better way to go.
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Mar 13, 2012
I have 2 roads crossing, and I have created the 2 corridors, and an intersection object created. I split the 2 corridor regions and put the intersection in, and then closed back in the regions to the start of the intersection object (region). Now - how do I make that all one corridor object that reacts to either of my profiles, and is only one corridor surface? - the corridor surface ignores my region boundaries Or at least 3 objects that interact with each other properly. Image 1 highlights the start/end of the corridor regions, and image 2 shows how the surfaces look - why doesn't the corridor surface start and end where the regions do?
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Dec 1, 2013
I have some geotextile sheets of specific dimensions (that's 45mx5m) and a surface (not a regular one) with grades ranging from 3.5% up to 34%.I would like to "fit" those sheets on the surface (which should overlap one another by .30m (see attached image)) but not project them, (that's why I don't believe "drape" is the proper word).
Meaning that since the 45m dimension is facing up/down slope, the length should be less in projection (see attached image) and that should be calculated automatically since the surface is a very irregular on (not like the attached dwg which is included as an example).
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