Generating Average End Area Volumes with a Retaining Wall Subassembly?

[JonVinci]

I have just started to get the hang of using C3D to generate average end area cross sections and fill/borrow estimates for my projects. My problem is that I am brand new to the retaining wall subassembly, but it doesn't seem to handle areas very well. When generating my surface from corridor, I usually use the links "Top" and "Datum" to capture the road, subbase, and side slopes/ditches at the bottom. 

Of course using Datum will include the whole retaining wall structure, which I don't want in my earth work. What combination of links/surfaces do I need in order to get accurate quantities without "RetainWallVerticle" subassembly botching it up?

[sboon · Accepted solution]

Comparing top and datum surfaces typically isn't very useful, as it includes multiple materials in the end area.  Look into using structure type materials for end area calcs of walls, road structure, curbs etc.  Basically any corridor shapes can be included without needing to build surfaces.

Steve
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