I am running SewerGEMS Sanitary V8i in ArcMap. I have a system of nearly 2000 conduits and manholes only. Right now, I have no physical data in the model, but I would like to generate manhole invert elevations for the entire system based on one elevation at the lowest point of the system and a constanst slope of 0.005 ft/ft up to the ends of all the branches within the system.
I want to do this so I can have a simple working model before I begin to enter actual manhole invert elevations individually.
Thanks.
Jason,
Have you looked into the element property inferencing tool yet? If you need to use automated design, I would suggest submitting a service ticket to technical support with your model file and the exact message that you encounter when trying to run design mode.
Most likely the problem is with the ground elevations: As Tom mentioned, you will need to enter these first, before using automated design. Terrain Extractor should make this easy, if you have a contour file. If your node ground elevations are all zero, it won't be able to design anything.
Also I just realized that I forgot one step in my last email: you'll also need to choose an initial section size (along with the shape and material) for each conduit before designing. You can do a global edit in the flextable for this.
Regards,
Jesse
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
I have all the true ground and invert elevations of manholes in hundreds of as-built drawing pdfs. My task right now is not to dig through all the as-builts and input the elevations one by one. My task is to get a model running, so I want to generate an imaginary system based on a single base elevation and a positive slope to all branch end nodes.
Jesse - I have done exactly what you have described except that when I try to compute, it gives me an error and tells me to validate. When I validate, it returns messages saying that all my manholes have 0.00 invert elevations, but as you know, that's exactly what I'm trying to change.
You can do this with SewerGEMS Sanitary's automated design feature. I would recommend reading the help documentation on this feature as well as going through quick start lesson 2.
Here's a basic summary of what you'll likely be doing:
1) Enter slope constraints in the design alternative as well as cover, velocity, etc.
2) Enter possible conduit section sizes in the conduit catalog and make them available for design
3) Set all conduits to catalog conduit with the same section shape and material
4) Enter the one known elevation for the low point of the system (probably your outfall node) and choose "false" for "design structure elevation". This way, the elevation will not be changed during automated design, and all other structures
5) Choose design mode in your calculation options, then compute
If you have any further questions, please contact support.
Edit: Good points Tom, on the ground elevation and inferencing tool.
First I'll assume you have ground elevations at all manholes. Otherwise you'll need to sue soemthing like TRex to get them.
There are several ways to do this. Using 0.005 uniformly can cause problems unless all the ground has that same slope. Usually you'll end up with pipes 100 ft underground or 30 ft in the air.
One option is to put some small loads at the top end of the system and let the automated design feature try to set inverts. I wouldn't try to force a constant slope but let the program handle it by adjusting inverts.
My preference would be to use the Element Inferencing tool. This only works one branch at a time. You just set the upstream and downstream invert and it will give you a constant slope between the two ends.
It is good to set up some profiles along branches to be able to visualize what you're dealing with.
Tom