Topography split issue

[phillipesfy]

Good morning all,



Quite new to Revit, still learning the basics.. I have a topography and I am trying to make roads that follow the topograpy. I have split the topography using the split tool and have changed the elevation so it is 150mm lower than the topography. However once i do thise there is a visible gap between the two surfaces. is there a way to fix this, by possibly thickening the surface?



I appretiate your time in advance.



Thanks,



Phillipe