AutoCAD Civil 3D

[#1]

I have a cross section view with a canal section and a flat water surface section.

Is there a way for C3D to calculate the 2D area of the canal section that is under the water elevation?

Thanks,

[#2]

Are you looking for 2d area of the cross sections per section view in square ft?

Or a surface area of all canal bottom that is submerged that takes into account the variation (3d) in side slopes &; bottom?

Could you post a sketch showing what is needed?

[#3 · Accepted solution]

You'll need to use the compute materials tool which is used to calculate volumes.  Then output new section views and include the volume table for each view.  This volume table will list the 2D area between the 2 surfaces.

[#4]

Here's a sketch of what I'm trying to do.

[#5]

See my previous reply.

[#6]

I got it to work on practice surfaces. Now we'll see if I can do it for the real world.

Thanks.

[#7]

Mike,

So it appears your not interested in the "average end area" in SF but rather LF of submerged bottom beginning at water level on left and terminating at water level on right?

[#8]

That is correct.

I apologize, I didnt' catch your question in the original post.

Thanks.

[#9]

you could create the cross section view showing the existing ground and the water surface, explode the sections twice, then trim the ground to the water surface to find its wetted perimeter (see attached video, rename the file to remove the ".txt" portion from filename). make sure your section views are created with no vertical exaggeration. not the most elegant method, especially if you have to compute wetted perimeters for multiple cross sections, but that's the best i can think of at the moment.

P.S: ingore the fact that the water surface elevation has ups and downs in the section view of the video, it represents FG for my project, but the idea is the same.

[#10]

Looks like that will work but you may want to "Export to AutoCad DWG" prior to all the trimming etc.,

which will also do the exploding for you. The resulting file would just be a working drawing for this exercise.

The integrity of your data wont be compromised in your source drawings either.