• All drainage objects within a release (including ponds, underground storage, and channels) now use a unified version for easier management. This object version implementation allows for methods to design a drainage system across teams without updating a drawing to a software release. An object's features are contingent on what version it in which it was created in what version it is open. Objects can be upgraded on command to leverage features in newer versions of Civil 3D. Learn more.
  
• Civil 3D now displays clear error messages when attempting to create Data References for Pond objects from host drawings created in older versions. This prevents compatibility issues and ensures data integrity when working across different project versions.
  
• Added a warning if there are mismatched runoff methods when starting Analyze Drainage System. Rational and Modified Rational methods use IDF rainfall data instead of hyetographs and these different types of rainfall data cannot be used together. Rational-based runoff methods cannot be used with other runoff methods in the same analysis.
  
• Improved the analysis behavior when pipes do not have a Manning's roughness coefficient assigned. A default value of 0.012 is assigned and a warning message displays that this value was used. This improvement provides a non-intrusive validation notification while highlighting the omission and still providing direct access to correctly set the value.
  
• Added the ability to connect a pipe to a pond or underground storage object during pipe network layout/creation.
  
• Improved the behavior when connecting a pipe to a stormwater control. Pipes will now connect whenever the end point is within the object boundary.
  

• Added support for channels in the Model Viewer.
  
• Added a Catchment Properties button on the catchment contextual ribbon for quick access to object or style properties.
  
• Updates to the Properties tab of the Catchment Properties dialog box. Learn more.
  

• Added the ability to extract static or dynamic feature lines from channels. Learn more.
  
• Added Command Settings. Learn more.
  

• The Inflows tab of the Pond Properties dialog box now contains information specific to connections with pipes, channels, and catchments. Learn more.
  
• Updates to the Outflows tab of the Pond Properties dialog box. Learn more.
  

• Analysis criteria is now saved as you work. Prompts to save changes have been removed to expedite workflows.
  
• Drainage Analysis will now prompt for a valid rainfall dataset before entering the analysis workflow.
  
• Added inputs and results related to the Rational methods and IDF rainfall to the analysis reporting.
  
• Changed the method for selecting rainfall for an analysis to use checkboxes on the Analysis Criteria page.
  
• Added a warning when there are no Catchment inflows when starting drainage system analysis.
  
• Improvements have been made when exporting analysis results by enabling export when part of the analyzed drainage system has changed. This solution allows exporting the results and analysis criteria, but the input data will remain disabled in order to avoid combining changed input values with previously returned results. The best practice is still to re-run the analysis to be sure the results match the current state of the drainage system.
  

• Autodesk DWG Integrity and Migration for Docs provides the technology to upload local project data to collaborative cloud projects. Learn more.
  
• Download the extension from manage.autodesk.com.
  
• DWG Migration for Docs is now officially named DWG Integrity and Migration for Docs.
  
• Added Single Sign-On (SSO) support, providing a seamless login experience consistent with other Autodesk products.
  
• Implemented the ODIS installer framework, aligning with the standard installation experience across Autodesk applications.
  
• File paths exceeding 248 characters will no longer block uploads, improving flexibility and reliability.
  
• Added support to export reference relationship JSON files. The reference relationship files define which files are to be uploaded and their reference relationships between them. It enables the Autodesk Bulk Upload Tool to upload files in the correct order, ensuring project integrity and completeness.
  
• Added the ability to configure the location for temporary files generated during the creation of the Reference Relationship JSON.
  
• Unsupported file types now align with other cloud product unsupported file formats.
  

• Cloud storage for sheet sets offers streamlined management and enhanced collaboration. The Sheet Set Manager allows efficient work with cloud-stored sheet sets. Learn more.
  
• The following updates are available with AutoCAD 2026.1.1. This AutoCAD update must be installed from manage.autodesk.com to enable the new connected Sheet Set Manager workflow in Civil 3D 2026.2.
  
• Added support for working with and organizing cloud sheet sets.
  
• Implemented performance improvements in loading and handling cloud sheet sets.
  
• The Sheet Set Manager clearly indicates the status of the sheet sets, informs of concurrent edits by others, and provides real-time notifications of data conflicts.
  
• Civil 3D 2026.2 enables collaboration with the Sheet Set Manager in the plan production workflow.
  
• Important: The Sheet Set Manager for Web has been removed in AutoCAD 2026.1.1 and later releases. Be sure to read the How do I Set Up Project-Aware Settings for a Sheet Set? FAQ to ensure future sheet set collaboration works as intended.
  

• Improved readability in the Horizontal Regression Analysis dialog by adding descriptive table titles.
  
• Improved validation of Alignment names. Unsupported characters are now blocked, ensuring names are saved and displayed correctly.
  

• Object Set Actions list in the Create Object Set dialog box.
  
• Quick Report/Export context menus for all object types in Project Explorer.
  
• AeccRunProjectExplorerActions command.
  

• Added a Catchment.SetRunoffMethod node for modifying the runoff method of a catchment.
  
• Added the following nodes for selecting items from drop-down lists:
  

• Added a warning when exporting LandXML files containing unsupported curve types.
  
• Added a new system variable 'AeccEnhancedSpiralSampling' to control spiral tessellation.
  

• Added a notification for clear feedback when converting a feature line segment from a straight line to an arc.
  
• Added the ability to edit the elevation of a PI and elevation point when hovering over the feature line PI or elevation point.
  
• Enabled conversion between feature line segments and arcs, allowing the extension of feature lines at either endpoint through both the ribbon and in-canvas interface.
  

• Added Channel.ByFeatureLine to create a channel from a feature line.
  
• Added Channel.ByAlignmentProfile to create a channel from an alignment profile
  
• Added the ability to Choose Channel Section Type on creation.
  

• Changed the confusing "Properties..." command to "Catchment Properties..." on the catchment right-click menu in Prospector.
  
• Fixed the title of the Catchment Properties group on the Runoff tab in Catchment Properties dialog box.
  

• Fixed an issue in which the PipeNetwork.ShortestPathBetweenParts node would return Part objects instead of Pipe and Structure objects.
  
• Fixed a stability issue when using Node Autocomplete.
  
• Fixed a stability issue that could occur with Python scripts with invalid API calls.
  
• Fixed an issue in which nodes for retrieving the reference surface of an object would return the wrong surface type.
  

• Fixed an issue in which moving a PI (Point of Intersection) to an elevation point on a feature line was not restricted, resulted in the unintended removal of the elevation point. This action is now prohibited to maintain elevation data integrity.
  
• Fixed an issue in which the point count was incorrect when importing a closed feature line from LandXML.
  
• Fixed an issue in which you could not snap a feature line elevation point to an intersection after editing.
  
• Fixed an issue in which you could move an elevation point to a PI from the elevation editor.
  
• Fixed an issue in which an arc radius would change when inserting a PI into an arc and removing the PI.
  
• Fixed an issue in which you could not insert a PI that is perpendicular to the segment.
  
• Fixed an issue in which an endpoint is missing after breaking a smoothed feature line.
  
• Fixed a stability issue when running reverse and join commands for smoothed feature lines.
  

• Fixed a stability issue when creating grading transitions.
  
• Fixed a stability issue when editing grading feature lines.
  

• Fixed an issue in which a gravity pipe network could not be set as the data source for profile view bands.
  
• Fixed an issue in which a gravity pipe network parts list did not display in the Import Style dialog box.
  
• Fixed an issue in which a structure height was not immediately updated when a pipe changed.
  

• Fixed an issue in which the offset calculated in the Horizontal Regression Analysis UI would display different results than those in the output alignment for spirals.
  
• Fixed an issue in which the localized versions of Horizontal Regression Analysis where the Segments Table could only be edited in English.
  

• Fixed a stability issue that could occur when the Adjust Mapcheck command did not generate the adjustment data files in Notepad successfully when using Windows 11.
  
• Fixed a stability issue that could occur when attempting to export a drawing.
  

• Fixed an issue in which UNDO did not work properly for ponds shown in Model Viewer.
  
• To alleviate confusion, connectivity info is no longer shown in the pond properties for data referenced ponds.
  
• Fixed an issue in which preview graphics did not display during mirror, rotate, or scale operations.
  
• Fixed an issue in which the bottom contour for a surface-based pond could show in the wrong location after an UNDO.
  

• Fixed an issue in which the pressure tee unexpectedly rotated when connected to a lateral pipe.
  
• Fixed an issue in which the pressure pipe network name did not display correctly in the table title.
  
• Fixed an issue in which certain pressure parts were added to the wrong pipe run after swapping a Tee/Cross.
  

• Fixed an issue in which projected solids could be displayed in a profile view.
  
• Fixed an issue in which the horizontal grid lines in a profile view did not display correctly.
  

• Fixed a stability issue that could occur when opening Subassembly pkt files in Subassembly Composer 2026.
  
• Fixed a stability issue that could occur the Loop Repetition was set as empty.
  
• Fixed an issue in which Subassembly Composer loop geometry was not working as expected.
  

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