Future Civil 3D Challenges will be hosted on the new Community Challenges site. Thank you all for your participation. Looking forward to seeing you on the new Challenges coming in the future…
Civil 3D can be used to help identify potential flood areas based on the water being at a specific elevation.
C3DChallenge 4: Download the zip file (contains C3D dwg and an aerial image) attached to this post. Create a floodplain elevation line at a specific elevation where it would intersect the ground.
Resources:
Create a Floodplain Boundary from a Surface
How to create a flood plain - Tip and Trick
Extra: Hide/Cut the hole in your final surface and drape the aerial image (from zip file) on that surface.
Not sure what Civil 3D Challenge is? Then check out this post
Here is mine
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