AutoCAD Civil 3D :: How To Calculate Runoff Water That Splits To Two New Subbasins
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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May 15, 2012
I have a site, on which I've created both a berm and a retention pond to contain runoff. I now need to see if this is retaing enough water at a certain surface elevation.
The existing site is one surface and the berm/pond are another surface.
Is there a way to do this?
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Jan 23, 2014
I have a line that i would ideally like to divide into 3 equal segments. The divide command places points along the line, but I can't snap to them.
I know that I can place a block at each point which I could snap to, but is there a way of doing it without creating a block? Also is there a command that actually splits a line into 3 equal-length lines?
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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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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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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 20, 2013
Any finding the Create Water Drop very slow in 2014?
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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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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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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Feb 12, 2013
We work on landfills that need stormwater control terraces and letdowns. It occurred to me to ask if there is some way to modify the water drop trace function (which examines a surface and determines the 90 degree to contours path) so that you could specify an angle to the contours of your choice. This would basically automate finding the flow path of a diversion berm. Any method of laying out, for instance a 2% flowline along a 3to1 slope or tougher yet, a face with variable slopes.
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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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Aug 14, 2012
We are being requested by more municipalities to perform a hydraulic analysis on the water system before we can extend water to the site. This is very crude doing it by hand. I have seen different softwares available that run inside of Civil 3D that will perform the hydraulic analysis. How others were performing hydraulic analysis.
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Dec 26, 2013
I'm trying to use pay items in a pressure water network I'm building.
I can't find a pay item that fits for the fittings.
Are fittings normally included in the LF of pipe or are they assigned their own pay item?
Civil3D 2014 SP1
Win 7 Professional - 64-bit
HP Z400
Xeon W3550 @ 3.07Ghz
24GB of RAM
Nvidia GeForce GTX 760
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Apr 13, 2012
Every time I go to use the water drop tool on a surface I have to change from the default layer 0 to my 'water drop' layer. I'm sure there must be a way to change it but I couldn't seem to find it in the surface styles...
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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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May 2, 2013
Original intent was for daylight to have 4:1 slope and keep within the R/W. This causes some areas to hold water as shown circled in the image. I know I should be able to give it parameters or targets to avoid this.
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Apr 22, 2013
C3D Version 2012
Surface does exist as we can see the triangles/contours or whatever we choose to display. When we run the Water drop command, we are getting a message saying that the point is outside of the surface. We have selected a valid surface by both picking it visually and selecting it from the dialogue. All layers are on and thawed and we are picking well inside of the surface.
Why it would be telling us that the point is outside the surface?
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Nov 28, 2012
I have modeled a theatre chair, and when I attempt to create a circular array the left arm/leg of the chair separate and rotate 180 degrees in the opposite direction. I am able to select the entire object but when I attempt to move/ create the array...pieces split and go in different directions.
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