I have an existing ground terrain and a proposed terrain (derived from the top mesh of my roadway corridor). I need to find displacement volumes for an embankment given a list of storm events with specific flood water surface elevations. I have tried a few methods:
1) Create Cut Fill Volumes - which has produced meshes for cut and fill. I've tried various techniques to trim the fill mesh using the flood water elevation (with a plane, then with a profile, then with a mesh). These tools don't seem to work with a complex mesh. The fill mesh fails to convert to a solid, so I can't trim it using any of those tools.
2) Analyze Volume - with the terrain model to terrain model and the terrain model to plane methods. The latter should work, but the problem is this is for the widening of an existing road and I only need to account for the additional fill being added to an embankment. I can't simply check the proposed terrain against a plane. Ideally, I'd like to convert the fill mesh to a terrain and then use this tool to just find the displacement volume (purple area in the attached screenshot).
If it comes right down to it, I'll just go old school and calculate this using end area volumes (not available to me as I'm using OpenRoads Designer Connect Version 3 - 10.03.00.43)... I do wonder, if I had 10.04 or 10.05, whether I could somehow use a substrata/topsoil or custom flood water feature definition as a short cut to generate a volumes report with this quantity broken out.
Perhaps I'm missing something obvious here... Maybe a hydraulic analysis tool or a different approach? Any suggestions would be most appreciated!