AutoCAD Civil 3D :: Area (On Sag) Inlet - Correct Head Relationship
Nov 29, 2012
The SSA literature states to use an On Sag inlet to model an inlet used in the middle of a parking lot.
This is more commonly known as an "Area Inlet" application, and is also used in areas such as airport runways, greenbelts and golf courses.
To develop the correct operating head relationship over the grate, we need to be able to enter a stage-storage curve starting from the grate elevation. This will develop the "cone" shape storage needed to develop the correct head elevation over the grate.
It appears looking at the On Sag options there is only the Ponded Area parameter available; the same parameter found in a Junction. This calculates the head elevation as a function of the ponded volume and a constant area.
I want to confirm that the On Sag inlet application used as an Area inlet, is using all four sides, full perimeter = 2(L+W), of the inlet for the weir flow calculations before orifice flow controls, not just 3 sides as a grate on a curb.
C3D 2014 SP1
W7x64; i7 8gb; Radeon HD 5700
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May 30, 2012
I think the execution would be relatively easy. how to tell detect if a symbol is within a rectangle vector area. so almost like a parent child relationship in HTML goes? was thinking about getting top bottom left and right of a layer called parent then checking all layers below it (maybe they have "child" naming scene, so i can match by layer name) if the top bottom left and right are >=/<= the one above it. so it is basically detecting if a box is inside another box.
URL...need to detect is symbol1 is within div1 or 2 and same with symbol2
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Sep 11, 2012
After testing a simple culvert and pipe, it appears that inlet control is not checked for pipes. Does this mean that I have to model all storm sewers in a network as culverts just to check inlet control?
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Jul 10, 2013
what structure to use to model yard inlet?
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Jan 24, 2013
I am working on drainage for a median storm sewer, culverts and ditching for a large freeway expansion project. I have median storm sewers running down my entire roadway (about 5kms). I have manually inputed the upstream and downstream elevations of the pipes in SSA, but when these pipes are connected to an inlet or junction, I only have the option of selecting one invert elevation for each structure (I am actually using a lot of catchbasin manholes in this project, which I am unsure of SSA's ability to model). I have multiple drops of varying elevation differences throughout the project, with some of these inlets/junction requiring drop structures due to the large difference in elevation change. How do I properly model this in SSA?
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Oct 17, 2012
I do not have two outlet from 4 different intakes. The four intake are modeled as on-grading intake and do have both a bypass link and pipe line attached. Attached is the model that I have been working with. The intake causing the problems are:
EX.I-01
EX.I-02
EX.I-05
EX.I-06
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May 8, 2013
On grade Inlet Inlet-01 does not have two outlet links. At least one stormwater sewer pipe and a bypass gutter link must be defined.How do I add another link?
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Jun 7, 2013
Any hydraflow calculates depth of flow and spread at sump inlets? Does it assume that the entire flow is coming from one direction (similar to an on-grade inlet)? Or does it make an assumption about how much flow is coming into both ends of the inlet?
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Jun 27, 2012
We recently began experimenting with SSA and are trying to verify the inlet calculations that were done in excel to make sure we understand the software before putting it into everyday use. We've created a custom parabolic street section and applied it to the bypass links, and as far as that aspect goes, we understand it and it's all working great.
How to model inlets directly across from each other in a street section. The issues arise when the top width (of Inlet 1, in the attached graphic, for example) exceeds the half section width and flows over the crown into the opposite side of the street (to Inlet 2, in attached graphic).
We have tried weirs and flow diversions to no avail. Attached is an example of what I'm trying to explain. Inlets 1 and 2 are opposite from each other, and both connect into a MH labeled SD-J 29+33.00. Link-05 connects to the next downstream MH, and there are 2 links that follow the gutter lines to the North used as bypass links from Inlets 1 & 2.
Civil 3D 2014
Windows 7 Professional
Intel Xeon E31270 @ 3.4 GHz
8 GB, 64-bit
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Dec 10, 2013
I would like to know if it is possible to display the pipe inlet/outlet elevation in my structure label. It seems like it is not possible.It is possible to use the inlet/outlet elevation of the pipe in my pipe label however I would like to display it in my structure.
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Dec 31, 2013
I have ran an analysis and SSA gave me Error 607 on the report. It says "Inlet A9 gutter capture curve is not a valid curve."
A couple things I did different from the video lectures...
I selected user define for the Tc to figure out Q. i computed those manually.
For the Inlets I have selected Maximum Capture Cutoff.
There are some inlets in this model I created that do not capture 100% of the flow so i created conveyance links to account for the bypass flow.Not sure why is not recognizing the Curve?
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Oct 23, 2012
How to changes the settings for the "Square Area" in mapcheck's closure summary. When I right-click the dwg name in the Settings tab of Toolspace and choose Edit Drawing Settings, then Ambient Settings, I see the Area settings, but in the closure summary, there is also "Square Area". Why are these both there? It WOULD be nice to show sq. ft. as well as acres, but I can't find anywhere to edit it.
Civil 3D 2012
Windows 7 Enterprise SP1
Dell Precision T3400
(Q9550 @ 2.83 GHz)
8GB RAM
Nvidia Quadro GTX 650 Ti BOOST
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Dec 7, 2012
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Autocad Civil 3D 2013 - Infrastructure Design Suite
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Jul 17, 2013
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Civil 3D 2012 & 2013
HP Z210 Workstation
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Jun 21, 2013
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Where can I get a manual to reference?
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Civil 3D 2014 HF1
Dell Precision T1650
i7 3770
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Feb 20, 2013
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