How to update your existing 2D surface in XPSWMM

  • add more details to the surface, such as adding breaklines for road
  • add proposed structures, such as new buildings, roads and ponds
  • Updating the surface in a 3rd party software such as Civil3D or ArcMap
  • Using a layered approach to combine a few DTM layers
  • Adding breaklines and elevation shapes

Updating the surface in a 3rd party software such as Civil3D or ArcMap

If you are designing a project in Civil 3D, this will be the easiest way to get your updated surface into XPSWMM.

  • In Civil3D, export your surface as a LandXML file
  • In XPSWMM, import the LandXML file

Using a layered approach to combine a few DTM layers

For example, we need to add a pond to the existing surface.

  • the existing surface is a flat surface at 10 ft
  • the proposed pond is 10 ft deep
  • create a new DTM that shows the surface for the proposed pond
  • then add it to your model, and make sure it is on top of the existing flat surface

Adding breaklines and elevation shapes

A more advanced approach is to use the built-in tools to add breaklines and elevation shapes into the model.

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