Raise/lower surface based on a grading group

[craig_leat2KUVH]

Hi,

I have several abutting platforms at different heights. These are described with feature lines of appropriate elevations. The feature lines (all closed polygons) have infill gradings and the gaps between the platforms have infill gradings. The perimeter of the development has a grading from the edges of the platforms to EGL. A surface was created from the grading group.

I wish to balance the cut/fill by raising/lowering the surface. When using RAISELOWERSURFACE the perimeter grading does not change. It still shows cut and fill banks, even though I have raised the surface sufficiently to have fill only. I notice the elevations of the feature lines have not changed. I could raise/lower each feature line, but that seems rather tedious. What am I missing here?

[neilyj666]

I'd be a little wary especially if all these are in the same site as this sounds like a recipe for a major crash - ensure you have a backup version before changing things

[EliANewlines · Accepted solution]

Raise/lower surface doesn't alter the feature lines/grading groups defining the surface. Because the surface gets raised uniformly, whatever slopes you had before, are going to remain after. In general I would recommend only using RAISELOWERSURFACE when there's a datum change or similar. In your case, you can raise all the feature lines with one command, by selecting all of them and using RAISELOWERFEATURES.

[craig_leat2KUVH]

Yes, RAISELOWERFEATURES works with multiple feature lines selected - thank you!