Hi, How are you doing.
I want to ask about catchment delineation for Sewergems, When I add a specified terrain model with a specific boundary, When the road is for example curved, Triangles are added from outside that boundary by extrapolation and non required catchments areas are added to the delineated area, I do not want the terrain model to add elevations from outside my surface boundary.
For example, when I perform Trex for gravity elements, when some elements are outside the surface boundaries, Sometimes the Trex extrapolates the elevations for those nodes, I do not want that in catchments delineation.
Thank you very much.
Hi Mohamed,
You mention terrain models/delineation as well as Trex. Are you using both? What type of terrain model file are you working with? Can you clarify what you mean by a "specific boundary"?
When you load a terrain model in Trex or the terrain model manager, it is processed and turned into a terrain that SewerGEMS can understand, but it should only only the extents of the input terrain model.
Can you provide an illustration and/or screenshots to help explain what you are seeing? (screenshots of SewerGEMS with the terrain as a background or "show contours/triangles" checked along with a screenshot of the file in another application where it looks as you would expect, for example).
If possible it would also help if you could provide the model and terrain files with steps to reproduce/observe the issue. These can be compressed into a ZIP file and provided privately if needed. See: Sharing Hydraulic Model Files on the OpenFlows Forum
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Hi How are you doing.
I have attached 2 screen shots; 1) The Terrain Model Triangles (LandXML Source), 2) The LandXML Border as Background
Capture 1 shows Elevation Triangles created outside the border shown in capture 2.
What I need is that the terrain model does not create any elevations outside the border and stick to the given LandXML surface boundary only.
Thanks for clarifying. Would you be able to provide a copy of that LandXML file so we can test it? Compress it into a ZIP file and either attach to your reply or upload using the ShareFile method. See: Sharing Hydraulic Model Files on the OpenFlows Forum
Hi Jesse,
Any solution?
I am experiencing the same problem.
We will need to be able to reproduce the issue. Please provide the files and steps to reproduce as mentioned earlier in this thread.
You can also check your version number and update to the latest version if not already. The latest version of our storm and sewer products is currently 10.04.00.158.
Please review the contour file in .dxf format. The model and contour files can be accessed from below link
https://we.tl/t-V4Aw525qKQ
In sewergems, the terrain model extrapolates the contour lines outside the ROW boundaries and this is affecting the usage of catchment delineation tool. Moreover, we are using version 10.04.00.158.
Appreciate any sort of response.
Thanks for providing the file.
In the terrain model properties, there is an option to show the color of the "boundary". If you change this to a different color, you can see the outer boundary is beyond your roads, which is why the contour lines are extended out to them.
Looking at the file in AutoCAD, I am not seeing any special boundary around the roads.
Here is a screenshot of SewerGEMS showing the terrain boundary in brown, roadway polylines as background in black, terrain model contours in blue and red:
AutoCAD, zoomed in showing no discernable boundary around the road polylines:
You may need to define a boundary polygon or consider using a different format of terrain file with boundary set, if you do not wish to use contours beyond the roadways.
You can see a similar concern in this article about the LandXML format.