Problem adding multiple materials in Compute Materials

[JStratton9M85Z]

Hi,

I am trying to calculate volumes using the average end-area method in Civil 3d. doe anyone know why I can compute multiple materials in one set of sample lines and sections?

 In this example, the upper red line is the ground surface, the black line is the bedrock surface, and the lower red line is the excavation surface. I wanted to split my excavation between rock and soil.

If I add only the soil, it calculates the soil excavation correctly:

As soon as I add the rock excavation, it recalculates my soil excavation to some weird, incorrect area:

The 000-100-204-309-CO surface is a composite that I made of the higher surface between the bedrock and the excavation surface (100-309-CP-1). 

I can do several workarounds, but it sure would be nice to get both quantities on one clean set of cross sections to save several sheets of repeated cross sections.

Thanks,

[Jeew-m]

Hi,

From the second image, I feel like the soil area hatch is there, but not displayed properly.

[JStratton9M85Z]

Thanks for the response. Unfortunately, the hatch and the associated cross sectional area are both wrong.

Here is the volume table for the first case:

And for the second case: