We have a basic pavement section with constant cross slope.
On the low side, a ditch has already been designed - meaning that the horizontal and vertical locations are set.
See image below.
We can get the front and back slopes of the ditch to work, but not without having the front slope tie back to edge of pavement, which of course changes the slope because the center of ditch is not a constant distance from edge of pavement.
So I think the dilemma is ---- what subassembly can be used to define the yellow segment -and let *that* point vary based on where the two slopes intersect...?
TIA