Cross-Section Volume Calculation Between Multiple TIN Surfaces (Layered Dam Embankment) – Civil 3D + Dynamo

Civil 3D
,
1

Hello,

I am working on a dam embankment model in Civil 3D and I need to automate volume calculations using Dynamo.

dique
dique1315×658 90.5 KB

Current setup (see attached image):

  • Multiple independent TIN surfaces representing structural fill layers constructed every 0.35 m (blue lines in section).

  • One TIN surface representing the dam design geometry (black line).

  • Existing ground and foundation surfaces are also present.

  • Cross sections have already been generated using Sample Lines along an alignment.

In the attached section view:

  • The red cloud highlights the volume between two consecutive fill layers (layer-by-layer as-built volume).

  • The green cloud highlights the portion of that layer confined inside the dam design surface.

What I need to automate:

:one: Volume between consecutive fill layers

For each cross section:

  • Extract the section geometry of two consecutive TIN surfaces.

  • Compute the bounded area between them.

  • Integrate volumes between stations (average end area method).

:two: Volume of each layer confined inside the dam body

For each cross section:

  • Compute only the area of the layer that lies inside the dam design surface.

  • Then compute volume between stations.

Important constraints:

  • Calculation must be based on section geometry, not global surface-to-surface volume.

  • All layers are independent TIN surfaces (not corridor shapes).

  • I need an automated workflow in Dynamo.

  • I am open to using Civil3DToolkit, Camber, or Python nodes if necessary.

Has anyone implemented something similar?

Specifically:

  • How can I extract section intersection geometry from multiple TIN surfaces?

  • What is the best way to compute bounded areas between surface profiles in Dynamo?

  • Is there a recommended approach for handling this per station?

Any guidance would be greatly appreciated.

Thank you.

I am currently using:

  • Civil 3D 2021

  • Dynamo for Civil 3D (included with Civil 3D 2021)

For better understanding of the geometry and surfaces, I am attaching a download link to the DWG file of the dam model:

DWG file download link:

Please feel free to review the file if needed.