Autodesk Civil 3D 2026.2 with Extensions Win x64 English

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Autodesk has released Civil 3D 2026.2. Building on previous releases, this version brings exciting new features, enhancements, and improvements to elevate your design experience.
Civil 3D 2026 brings a host of meaningful enhancements that improve both the depth and flexibility of the design process. From more intuitive surface referencing with partial data shortcuts, to a significantly improved 3D modelling experience with Model Viewer, this release shows Autodesk's continued focus on performance, usability, and integration. The introduction of Drainage Analysis as a tech preview opens the door to more sophisticated and collaborative stormwater design workflows, and updates across Dynamo and the Autodesk Construction Cloud highlight a growing ecosystem where automation and cloud-based review are becoming the norm. Whether you're a long-time user or just starting with Civil 3D, these updates provide new tools to streamline your workflows, enhance collaboration, and push design capabilities further. As always, user feedback will play a critical role in shaping these features for future releases so explore, experiment, and don't hesitate to share your thoughts. Civil 3D 2026 is more than just an update, it's a step forward in how civil infrastructure is designed and delivered.

This release includes new and updated features, performance enhancements, and fixes for Autodesk Civil 3D 2026.2.
Autodesk Drainage Tools for Civil 3D (What's New in 2026.2)
Autodesk Drainage Tools for Civil 3D are now included and installed with Civil 3D 2026.2. This is a production-ready tool set designed to integrate the drainage design environment of Civil 3D with analysis capabilities powered by InfoDrainage analysis cloud-services-all without leaving Civil 3D! This enhances drainage design capabilities by providing new workflows for the design of ponds, underground storage devices, and open channels, as well as improved catchments with expanded runoff method support.


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When a drainage engineer prepares to analyze a system, the analysis can be initiated directly within Civil 3D. This allows for the utilization of various rainfall and runoff methods and facilitates the execution of multiple storm event simulations. Upon completion of the analysis, engineers can validate results, including any warnings or errors, before applying them to the drainage components within the drawing and exporting a comprehensive analysis report.


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To support the analytical workflows, a rainfall manager for the creation and management of rainfall events is included


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As mentioned above, Drainage Tools for Civil 3D is now installed with Civil 3D 2026.2. Improvements provided in this update include support for Intensity-Data-Frequency (IDF) rainfall sets and stormwater object version compatibility across software versions.
General Drainage Tool Enhancements
- 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.
Catchment Updates
- 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 edit flow segment data and to add flow segments of the type required for the catchment area on the Properties tab of the Catchment Properties dialog box. The legacy Flow Segments Vista has been removed from Civil 3D. In-product workflows, such as right-click context menus, have been adjusted accordingly.
. Rational and Modified Rational Methods added on the Runoff tab of the Catchment Properties dialog box. This runoff method calculates peak runoff based on the area of the catchment, the runoff coefficient, and rainfall intensity derived from Intensity-Duration-Frequency (IDF) rainfall data.
. Enabled selection of a Reference Surface on the Properties tab of the Catchment Properties dialog box by adding a dropdown list and button to pick from the drawing. The functionality has been added here to maintain the ability to chose a surface to use for Flow Segment slopes.
. Re-enabled the ability to enter time in different time units to have the User-Defined Time of Concentration value converted to the current display units.
. Added the ability for a catchment discharge to reference a pond or underground storage object instead of just a pipe network structure.
Channel Updates
- Added the ability to extract static or dynamic feature lines from channels. Learn more.
- Added Command Settings. Learn more.
. Channel Baseline settings added for alignment tangent, alignment and feature line curve, and alignment spiral. Default settings are 5.0.
. Channel Cross-section settings added to define the channel cross-section type default. Default setting is Trapezoidal.
. Feature Lines from Channel settings added for the name template and line style for the extracted feature lines.
Pond Updates
- Updates to the Storage tab of the Pond Properties dialog box. Learn more.
. Added the ability to export storage curve data to a *.csv file.
. Depth increments are now available to define the storage curve for a conceptual pond.
. Improved storage tables of surface generated ponds by allowing deletion of user-defined rows that contain invalid data.
. Added storage calculation options for Surface volume, Conic approximation, or Average end area. Surface generated ponds will always use Surface volume.
. Added a dynamic staged storage curve chart displaying storage area, depth, and volume. Placing a cursor over a depth in the chart will display the appropriate data for that stage.
- Updates to feature and command settings.
. Added feature and command settings
.. Added a setting to control the default style for feature lines associated with a pond.
.. Added storage settings for freeboard, depth increment, and storage calculation method.
.. Added infiltration settings for infiltration type, bottom infiltration rate, side infiltration rate, and safety factor.
.. Added a setting to control the default curve radius for pond contours.
.. Added Feature Lines from Pond settings for the name template, dynamic linking, and a list of which feature lines to create.
.. Added Create Pond settings for pond depth, elevation, elevation reference, and inside slope.
.. Added Create Pond from Object settings for pond depth, elevation reference, inside slope, and an option to remove the existing entity.
- 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.
. Organized information specific to connections with pipes and channels.
. 'Base infiltration' has been renamed to 'Bottom infiltration.'
Underground Storage Updates
- Updates to the Storage tab of the Underground Storage Properties dialog box. Learn more.
. The algorithm for calculating storage area and incremental storage has been revised. Changing any value in one stage of storage does not affect the preceding stage. When modifying the storage area column, the values in other cells within this storage area column remain unchanged.
. Added the ability to export staged underground storage to a *.csv file. The data includes depth, storage area, incremental storage volume, and volume.
. Added a dynamic staged storage curve chart displaying storage area, depth, and volume. Placing a cursor over a depth in the chart will display the appropriate data for that stage.
Rainfall Manager Enhancements
- Intensity-Data-Frequency (IDF) Rainfall Sets added for rainfall data management.
. Import IDF rainfall data from custom, NOAA, SSA, and Hydraflow *.csv files.
- Added the ability to display, hide, zoom, and expand visualization graphs for known rainfall events and IDF rainfall data.
Drainage System Analysis Enhancements
- 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.
Cloud Tool Updates (What's New in 2026.2)
Autodesk DWG Integrity and Migration for Docs 3.0
- 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.


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Autodesk Bulk Upload Tool
- The Bulk Upload Tool works with Autodesk DWG Integrity and Migration for Docs and Desktop Connector. This allows for the upload of large files, folders and projects from your desktop to collaborative cloud projects while maintaining drawings and Civil 3D references.
AutoCAD Sheet Set Manager
- 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.
Civil 3D Tools
- Perform alignment awareness and civil infrastructure-specific design review workflows in Autodesk cloud products.
Infrastructure Design Review in Autodesk Construction Cloud (What's New in 2026.2)
Civil Tools added to the Autodesk Model Coordination viewer. Use Civil 3D alignment stationing navigation, perpendicular cross sections, and civil engineering inquiry tools such as station offset measurement to enhance your multidisciplinary review process. Combine these tools with existing Model Coordination workflows like clash detection, issues, the object table, object colors and advanced filters for a streamlined experience in an aggregated model environment.
Horizontal Regression Analysis (What's New in 2026.2)
- 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.
New in Project Explorer (What's New in 2026.2)
Added the ability to export 3D AutoCAD DWG files.


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This option is available to the following:
- 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.
New in Dynamo for Civil 3D (What's New in 2026.2)
New nodes for drainage objects
- Dynamo for Civil 3D 2026.2 includes several groups of new nodes for stormwater control objects, which can be used to boost efficiency for drainage design and analysis workflows. The 75+ new nodes can be found under the "Drainage" section of the Civil 3D node library. These nodes enable you to automate workflows involving pond design, configuration of channel hydraulic parameters, storage curve analysis, and more.
Revamped Node Autocomplete
- Node Autocomplete has received a complete makeover in Civil 3D 2026.2. By simply hovering over any port on a node, you'll see a purple icon that triggers a new Node Autocomplete toolbar when clicked. Node Autocomplete is an efficiency-boosting feature that, similar to how text processing tools suggest the next word, offers several node suggestions to connect to your selected port. These machine learning-powered node suggestions have the potential to vastly speed up your graph-building workflow, minimizing the need to spend time searching for the right node via trial and error.
Updated Dynamo Core
- Dynamo Core has been updated to version 3.6.1, which introduces the previously mentioned Node Autocomplete improvements, enhancements to groups, and bug fixes. In addition, it adds significant performance updates that are all about turbocharging your Dynamo navigation experience, making it faster and more responsive, thus minimizing your wait time. Read more about the major updates in the Dynamo blog.
Other minor improvements
- Added a Catchment.SetRunoffMethod node for modifying the runoff method of a catchment.
- Added the following nodes for selecting items from drop-down lists:
. Choose Runoff Method
. Choose Catchment Group Name
. Choose Catchment Name
Miscellaneous Enhancements (What's New in 2026.2)
Alignments
- Added a warning when exporting LandXML files containing unsupported curve types.
- Added a new system variable 'AeccEnhancedSpiralSampling' to control spiral tessellation.
Feature Lines
- Performance Improvements:
. When editing elevations.
. When selecting and querying in the feature line properties palette.
. When offsetting siteless feature lines to maintain their independent non-site status.
. When editing siteless feature lines.
. When adding a Point of Intersection (PI) to a feature line's arc segment, maintain the original radius of both arc segments.
. When importing and exporting to LandXML.
- 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.
API Enhancements (What's New in 2026.2)
Updates to the API have been made in the following feature areas:
Catchments
- Exposed the Runoff method to Catchment .Net APIs
Channels
- 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.
Ponds
- Added new API classes for creating and editing ponds
. Pond
. PondContour
. PondContourCollection
- Added PondStyle and PondStyleCollection classes for managing pond styles.

Assemblies and Subassemblies
- Fixed an issue in subassembly composer in which a LOOP object placed on LH side was not working correctly.
COGO Points
- Fixed a stability issue that could occur when using the COGO Editor.
Drainage Tools: Analysis
- Fixed an issue displaying export status messages for a drainage analysis after the Export panel was collapsed.
Drainage Tools: Catchments
- 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.
Drainage Tools: Rainfall Manager
- Fixed an issue where duplicate custom rainfall distributions could be created when importing a rainfall library.
Dynamo
- 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.
Feature Line
- 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.
Grading
- Fixed a stability issue when creating grading transitions.
- Fixed a stability issue when editing grading feature lines.
Gravity Pipes
- 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.
Horizontal Regression
- 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.
Miscellaneous
- 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.
Model Viewer
- Fixed an issue in which a Dynamo-owned object was not updated correctly in Model Viewer.
Ponds
- 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.
Pressure Pipes
- 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.
Profiles
- 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.
Project Explorer
- Fixed an issue in which alignments in the "Set Reference Alignment" and "Set Reference Surface" dialogs did not display by name in alphanumeric order.
Rail Design
- Fixed an issue in which selecting a specific profile from the drop-down list in Create Diverted Profile was ignored, and Civil 3D always used the first profile of the related alignment instead.
Reference Templates
- Fixed an issue in which changes to Property Data format in a Property Set within the reference template file were not being synchronized with the host drawing.
Subassembly Composer
- 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.
Surfaces
- Fixed a stability issue when creating a wall breakline from a polyline with a short segment.

Civil 3Dsoftware from Autodesk addresses the needs of civil engineering companies involved in standalone and BIM (building information modelling) Civil engineering projects. Built on a familiar AutoCAD platform AutoCAD Civil 3D has been specifically geared to address the challenging needs of civil engineers around the world involved in complex and demanding civil engineering projects such as land development, transportation and even water based engineering projects.
What's New in Autodesk Civil 3D 2026
Autodeskhelps people imagine, design and create a better world. Everyone-from design professionals, engineers and architects to digital artists, students and hobbyists-uses Autodesk software to unlock their creativity and solve important challenges.
Owner:Autodesk Inc.
Product Name:Civil 3D
Version:2026.2 with Extensions *
Supported Architectures:x64
Website Home Page :www.autodesk.com
Languages Supported:english
System Requirements:Windows **
[b]Size:[/b]15.0 Gb

CIV3D_2026_English_win_db_001_002.exe
CIV3D_2026_English_win_db_002_002.7z
C3D_2026_2_Update.exe
Autodesk_Civil_3D_2026_2_Object_Enabler
12d Data Extension 2026 for Civil 3D 2026
Autodesk IFC 4.3 Extension 2026 for Civil 3D
Coordinates Transformation Tool 2026 for Civil 3D
Country Kit 2026 for Civil 3D
CPIXML Extension 2026 for Autodesk Civil 3D 2026
DACH Country Kit 2026 for Civil 3D
DWG Integrity and Migration for Docs (Civil 3D 2026)
GENIO Import and Export Extension 2026.0.1 for Civil 3D (Civil 3D 2026)
Geotechnical Modeler Extension 2026 for Civil 3D
Grading Optimization 2026 Update
InfoWorks ICM Import and Export Plug-in 2026 for Civil 3D
Infrastructure Parts Editor 2026 Update
PPK Survey Extension 2026 for Civil 3D
Rail Data Exchange Extension 2026 for Autodesk Civil 3D 2026
SHP Import and Export Utility 2026 for Civil 3D

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