C3DR Average Slope Reports

C3DR Average Slope Reports

Win64, English

Civil Reminders
Creates an average surface slope report based on the contour lengths and an average surface slope report based on contour lengths by slope ranges.

General Usage Instructions

The product allows for the calculation of average slopes of surfaces by contour lengths. This is useful when required by government agencies.

The Add-ins Tab should contain the two commands or you can type C3DRAvgSlope or C3DRAvgSlopeByRange at the command line.

The Avg Slope Report extracts the contours from the surface and then reports data in an Autodesk® AutoCAD® table.

The Avg Slope Report Ranges extracts the triangles from the surface, calculates the slope of the triangles, calculates the contour segments on the triangle, and then the report outputs to either csv or an AutoCAD Table. 

•  The Plus button adds a row to the slope ranges.

•  The Red X button removes the selected row in the slope ranges.

•  Minor Contour Interval is the interval the report will be run on.

•  Major Contour Interval is for information only and is 5x the Minor Contour and is not used.

•  Header - The header of the column for the output report. It is modifiable by the user.

•  Start Slope - The start slope of the range.

•  End Slope - The end slope of the range

Note that there is no error checking of the ranges.

•  Color Index – The color applied to the polylines within the range if the Create Polylines for Ranges option is selected.


•  AutoCAD Table - The report will be added at the user's selected point.

•  CSV File - The report will be output to a CSV file.

•  CSV Path - The path the report will be output to.

•  ... Button - Allows for the save location of the CSV file to be saved.

•  Create Polylines for Ranges - Creates polylines for each range. The created polylines' color start at color index 1 and is incremented by 1 for each range. This provides a way to show where the contours occur and to check the report's data. It defaults as off.

•  Ok - Closes the window and then the report will run.

•  Close - Closes the window and the report will be canceled.

The reports will be slightly different since they are reporting on two different methods of extracting the data. This occurs most often when in areas where the surface has flat triangles. Messages are sent to the command line indicating the location of the flat triangles. This most often occurs in surfaces created from contours instead of TIN data.

Section View Datum

  • Select the surface section to use as the minimum elevations.
  • Select the section views to modify.
  • The command will then go through each section view, find the section with the source name, find the minimum section elevation, and then set the Section View to User Set, sets the minimum elevation of the section view, and then the maximum elevation using the existing section view height. 
  • Note: The elevations are rounded to 3 digits before applying the minimum section view elevation. 



Ribbon/Toolbar Icon Command Command Description


Reports the average slope by contours within slope ranges.


Runs the C3DR Average Slope Report based on extracted contours from a surface.

Section View Datum

Adjusts the selected section views minimum elevations to match the minimum elevation of the selected surface section. This command only works with Autodesk® Civil 3D® 2020 Update 6 and newer.


The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

The product is installed in this location: C:\ProgramData\Autodesk\ApplicationPlugins\C3DRAvgSlopeReport.bundle

Additional Information

Known Issues

No known issues

Selecting a non-surface section will cause issues. 


Company Name: Civil Reminders

Author/Company Information

Civil Reminders

Support Information

Contact Support at Support@Civil3DReminders.com

Version History

Version Number Version Description


Added support for Civil 3D 2024


Initial release.
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