Tips from Experts

Subdivision Grading with Corridors

10/1/2020

Jim Coppinger of ZenTek Consultants explains how to inventively employ some Civil 3D techniques to employ Corridors and Gradings in Subdivision grading design.
From the ZenTek Consultants YouTube Channel.

Comments

If you understand and employ Feature Line based Gradings in Civil 3D, Jim's technique to employ Corridor geometry Feature Line output will be easy to understand.
The Frequencies employed in the Corridor Regions do have a direct effect on the detail in the Extracted Feature Line(s).

Yes. You may want the Datum of the Corridor cross section and a Feature Line specific to that for a grading surface.

Recognize that these days the Corridor and dynamic Extracted Feature Line can be from a Data Reference (DREF) Corridor source.

I tend to prefer a Multiple Baseline Corridors approach with grading Assemblies to accomplish more with the Corridor.
That is usually easier to manage in the long run considering all the potential complex design control in a Subdivision project in Civil 3D.
See the Site Grading with Corridors section.

Open the Corri Door to On-Site Grading

12/3/2019

John Armendariz, CAD Coordinator at Kimley-Horn shares some method and practice about from moving from a Civil 3D Feature Line only workflow to a more Corridor centric workflow.
See the Autodesk University Class Session.

Comments

John's first step method is to learn to employ simple Corridors with a Set of various Assemblies to produce Breakline content for a Civil 3D design Surface.
The second step method is to then employ a Feature Line based Molded (or intermediate Surface) to drive the vertical control for a bunch of site details.
The basic details and usage of the supplied Assembly details are demoed effectively in the video.
The Molded Surface attach plan is briefly demoed in the last section of this session.

Create a Corridor into the Corners

07/19/2020

Jowenn Lua walks through a solution for corridor resolution with problematic perpendicular corners in Civil 3D.
From the Autodesk AKN Civil 3D Screencasts
See Jowenn Lua's AKN page

Comments

This is a workable but complex solution to the common problem of purely perpendicular targets in corridor resolution.
Both an intermediate surface (from another corridor) and Assembly Offsets are employed in the workflow.
You have to ask...What if you change the design plan and employ Offset Alignments, Slope Controlled Profiles, and Widenings?
Regions and a few added Frequency stations are required.