I need to model a ditch that is 1' below where the backslope meets the existing ground. I found an earlier forum on this, but the video posted to help has since been removed. I currently have my template set up with one end condition that finds the existing surface then another that draws the ditch with a backslope that finds the surface. However, in areas with a steeper fill slope, I am ending up with a ditch that is less than the required depth on the backside. See below. The green is how its currently modeled and the red is what I am trying to do.
Work backwards. Since the location of the ditch relies on the location of the catch point (or daylight point), find that point first. Create some null points that mimic the geometry of your ditch, starting at the hinge point or somewhere along the fill slope. From the last of those null points run an end condition (not triangulated) to find the catch point. Place your ditch working back to the road, with the last segment tying back to the hinge point.
Ray, this is exactly what i was looking for thank you for your help!
I've watched videos that try to explain this that are far less clear than this single diagram. Bravo, Ray!
Charles (Chuck) Rheault CADD Manager
MDOT State Highway Administration