SewerGems Catchment Delineation, Terrain Boundary

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.

Parents Reply
  • 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.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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