Adding elevations to a surface to create farm drive grading

[dalton.marsh]

on the northeast quad of my site I have a farm drive with a ditch running through it.  my problem is that I want to add a 3 to 1 slope on each side of the drive to add a pipe going underneath the drive.  how would I add the elevations to my corridor or to my surface create those slopes.

[mzjensen]

I'm not sure that I'm fully understanding what you're trying to do, but I'll give it a go. It looks like you have a corridor for the main road (running east/west) with a ditch on the north side. Then you want to grade a farm drive (essentially a driveway) that crosses over the ditch with 3:1 side slopes so that you can place a culvert under the driveway to maintain flow for the ditch. Is that correct?

I think you've got two options:

1. It looks like you currently have a single corridor for the whole design. With this setup, you won't be able to use a 3:1 daylight slope subassembly because you can't target the surface created from the corridor itself (that creates an infinite loop). So if you want to stick with a single corridor for the main road and ditch, then I would grade the driveway using feature lines and grading groups. You can have a surface for the corridor and then a separate surface for the driveway grading. Then create a new "merged" surface where you paste the two together.
2. If you want to do everything with corridors, then I would create a separate alignment, profile, and corridor for the driveway. Then you can use a 3:1 "slope to surface" daylight subassembly that targets the surface created from the other corridor. Again, you would have to paste the two corridor surfaces together to create a single composite surface.

Personally, I would just use feature lines. Hope that helps.