Free Download Autodesk Civil 3D 2026.1 Update | 1.7 Gb
Autodesk Civil 3D 2026.1 Update is the latest release aimed at improving the functionality and stability of Civil 3D, the powerful civil infrastructure design software. This update delivers refined tools for corridor modeling, grading optimization, and pressure networks, along with essential bug fixes. It's designed to support civil engineers, designers, and surveyors working on transportation, land development, and environmental projects.
Category:
Engineering Software > Civil & Infrastructure Design
Download Autodesk Civil 3D 2026.1 Update to enhance civil engineering design workflows with performance improvements, new features, and stability enhancements.
Autodeskhas releasedCivil 3D 2026.1. This release includes new and updated features, performance enhancements, and fixes for Autodesk Civil 3D 2026.1.
Owner:Autodesk Inc.
Product Name:Civil 3D
Version:2026.1 Update with Updated Content *
Supported Architectures:x64
Website Home Page :www.autodesk.com
Languages Supported:english
System Requirements:Windows **
Software Prerequisites:pre-installed Autodesk Civil 3D 2026.0 and above
Size:1.7 Gb
C3D_2026_1_Update.exe
Autodesk_Civil_3D_2026_1_Object_Enabler.exe
DrainageAnalysis_for_Autodesk_Civil_3D_2026.1.exe
GradingOptimization_2026.exe
Autodesk Drainage Analysis for Civil 3D (What's New in 2026.1)
Drainage Analysis for Civil 3D workflows are now available. In this update improvements have been implemented for stormwater controls, the Rainfall Manager, and various user interface enhancements.
General Stormwater Control Enhancements
- Ponds, underground storage objects, and channels can be viewed in Autodesk Construction Cloud.
- Ponds and underground storage can now be added to the Model Viewer.
- In the Prospector, Stormwater Controls have been moved from the Pipe Networks node to their own first level node.
- The LIST command now displays properties for pond and underground storage.
- Ponds and corridors have been added to the Data Shortcuts Editor.
- Drawings containing Pond, Underground Storage, and Channel objects from the tech-preview will open and display correctly in this 2026.1 release. Version compatibility and tracking is maintained.
While analysis functions normally, it is not possible to create or edit drainage design object geometry or properties.
. A warning dialog dispays to indicate incompatibility with Civil 3D Drainage Analysis.
. To update these objects to the current version for editing, run AECCDRAINAGEDESIGNUPGRADE from the command line.
Pond Enhancements
- Ponds can now be shared between drawings using data shortcuts and data references.
- The Storage tab on the Pond Properties dialog box has been redesigned for clarity.
- Ponds can now be created from surfaces. They can also be updated using the Redefine from Surface command.
- Pond now have type classifications. Conceptual ponds are sketched in the drawing. Surface-Based ponds are created from surfaces.
- Four new commands are available for editing pond grading: Quick Edit Pond, Add Side Slope, Add Contour, and Delete Contour.
- You can now adjust slope and volume of a pond from modifying the object in canvas. This includes adding slopes, editing slopes, deleting slope contours, adding contours and editing contour elevations.
- The Add Curves command has been renamed to Fillet Pond.
- The stage storage curve for surface-based ponds can be configured using the "Depth increment" or "User-defined" modes.
- Pond volume calculation has been improved.
- Style selection drop-downs are now available in all pond dialog boxes.
Channel Enhancements
- Added the CreateChannel command.
- Additional cross section shapes are available for Triangular, Rectangular, and Custom channel sections.
- A custom channel section can be defined manually, by importing points from a CSV file, or by picking a subassembly in the drawing.
- A custom channel section can be defined by importing from an existing Sub-assembly in the drawing.
- The station range for a channel baseline can be customized (Raw Station).
- Alignment and Profile as Channel Baseline support has been implemented for channel creation.
- Channel command and feature settings are now available.
Underground Storage Enhancements
- You can now select an underground storage and create, copy, and edit its plan view style from the contextual menu.
- Added the ability to display the proportion of empty space (voids) in a stage depth for water storage.
Rainfall Manager Enhancements
- User interface improvements were implemented to easily create, organize, modify, and exchange various rainfall data.
- Added Distribution Based Rainfall in order to create rainfall data based on a rainfall depth applied to a rainfall distribution.
- Added the ability to create a Distribution Based rainfall event based on SCS rainfall distributions and a valid rainfall depth (0 to 10080 mm).
- Added the ability to import and export individual or sets of rainfall data with a Rainfall Library (*.RAIN) file in order to share with other drawings.
Drainage Analysis Enhancements
- Added individual and total system outfall details to the Drainage System tab of analysis results.
- Export option enhancements include selection of current result columns, all results columns, or exclusion of results entirely.
- Exporting analysis data now includes rainfall and input data.
- Additional tabs of input data are now included in the analysis exported Excel file. These include SBUH Runoff, Structure, SCS Runoff, SWMM, Analysis Criteria, Stormwater Controls (Ponds and Underground Storage), Connections (pipes and channels), Stormwater Control Outlet, and Time Area Runoff.
- Added support to pass bypass flows from an inlet structure to the downstream target inlet structure.
Horizontal Regression Analysis (What's New in 2026.1)
Horizontal regression analysis is a powerful technique used to create an optimized alignment for linear infrastructure based on surveyed data of an existing path. Over time, features like railway tracks or roads can shift from their original position, developing imperfections that affect performance and safety. Horizontal regression addresses this by taking measured points along the current path and calculating a new, "best-fit" alignment composed of geometric elements like tangents (straights), circular curves, and transition spirals. The primary goal is to create a smooth, precise alignment that minimizes the deviation, or "slew," from the existing feature's location.
This method is essential for civil engineers, particularly in rail and highway design, for several key reasons. It allows for the accurate recreation of "as-is" geometry when original design plans are lost and is crucial for guiding track maintenance and renewal projects. By smoothing out irregularities, it enhances safety and ride comfort while minimizing wear on infrastructure. Additionally, by creating an alignment that is as close as possible to the current one, it can significantly reduce construction costs during upgrades. This technique of fitting a geometric line to real-world data is a foundational tool for improving the design, safety, and efficiency of linear projects.
Generate alignments with Horizontal Regression Analysis by selecting one or two linear data paths (COGO points, feature lines, or 2D/3D polylines). Using the Horizontal Regression Analysis Vista that then displays a potential solution, you can then adjust thresholds to refine the final alignment data for creation.
3D Model Viewer (What's New in 2026.1)
- Added interference checking in the Model Viewer.
- Implemented a switch for Station Tracker.
- Transparency is now available in the Model Viewer.
New in Project Explorer (What's New in 2026.1)
- Added pick buttons to select start and end structures from a pipe network from the viewport. Start and end structures can still be selected from their appropriate drop-down menus.
- Improved the ability to easily scroll through long lists of structures when selecting a start and end structure for the profile view in the Pipe Networks tab.
- Added new items to the context menu in the Structures List view that allow any selected structure to be assigned to the Pipe Network View as a Start or End Structure. Right-clicking a structure now offers the following additional options:
. Assign to Pipe Network View Start Structure
. Assign to Pipe Network View End Structure.
- Added support for transposing base object table columns into rows in reports and AutoCAD tables.
- Added support to export XML data files.
. "XML files" added to the drop down list of file types in the Create Quick Report dialog.
. "Report to XML File" added to the drop-down Object Set Action list in the Create Object Set dialog box.
New in Surface Workflows (What's New in 2026.1)
Performance improvements have been made when exporting a surface to a Digital Elevation Model (DEM) or Tagged Image File Format (TIFF) formats.
New in Dynamo for Civil 3D (What's New in 2026.1)
New features
In-depth documentation for Civil 3D nodes
The nodes in the Civil 3D section of the library now include additional documentation and sample graphs to help explain how they work. To view this information, right-click on a node and then click "Help... ", or select the node and press F1.
In-depth documentation for Civil 3D nodes
Dynamo Core has been updated to version 3.5.2, which brings a new package publishing experience; the new Curve Mapper node, with nine different curve types; List.ReplaceItemAtIndices and List.GroupBySimilarity nodes for list manipulation; a trim boundary condition for paneling nodes, and more. Read more about the major updates in the Dynamo blog.
Other minor improvements
- Added a new node called Alignment.RenumberTags for renumbering tags along an alignment according to their geometric order.
- Improved the performance of the FeatureLine.SetElevationsFromSurface and FeatureLine.SetPointElevation nodes.
Miscellaneous Enhancements (What's New in 2026.1)
Alignments
- Added an AutoRenumber option when using the Renumber Tags ribbon command (or EDITTAGNUMBERS on the command line). This allows for the automatic renumbering of tags. Learn more.
Cross Sections
- Added the 'Distance to Next Sample Line' property to the sample line label and the labels for incremental section data of the section data band style in the profile view.
Feature Lines
- Added the ability to right-click a feature line in the Prospector list view to select "Zoom to" and "Pan to" from the context menu.
- Added the ability to insert and delete Point of Intersection, insert and delete Elevation Point directly from canvas, when hovering over a feature line grip.
Superelevations
- Added notifications about requiring potential station adjustments when importing CSV files with Superelevation data into alignments containing station equations. Learn more.
Surfaces
- Improved surface creation from grading.
API Enhancements (What's New in 2026.1)
Updates to the API have been made in the following feature areas:
Alignments
- Added SettingsTag.SettingsCreation and SettingsTag.SettingsRenumbering to automatically renumber alignment tags based on station order.
Labels
- Added LabelStyle.GetDescendantIds() and LabelStyleCollection.GetDescendantIds() to get the objectId collection of all descendant label style objects.
- Added the LabelBase.ApplicableLabelStyleIds property, allowing Label and LabelGroup objects to directly access their associated LabelStyleCollection.
Model Viewer
- Added ModelViewerSetObjects to specify a set of objects to display in the model viewer.
Pressure Networks
- Added PressurePart.GetPartSize() to get the part size used to create the pressure part. Null is returned if the part size cannot be found in the parts list.
- Added PressurePartSize.PartListId to get the ObjectId of the PressurePartList object that owns the part size.
- Added Part.GetPartSizeId() to get the ObjectId of the PartSize used to create the part. ObjectId.Null is returned if the part size cannot be found in the parts list set to the network.
Surfaces
- Added SurfaceOperation.Guid to retrieve the GUID of a surface operation.
- Added SurfaceOperationCollection.get(GUID) to retrieve an operation from the collection based on its GUID.
- Added a SurfaceOperationCollection.Remove(GUID) to remove an operation with a specified GUID from the collection.
Alignments
- Fixed a stability issue that could occur when a fixed spiral was added to the Alignment with Design Criteria set.
Assemblies and Subassemblies
- Fixed an issue in which Ctrl+C and Ctrl+V did not paste a copied subassembly at a specified point.
- Fixed a stability issue that occurred when using the API CorridorTransistionSet constructor. Updated API CorridorTransitionSet constructor. Seed subassembly changed from applied subassembly to subassembly from the assembly latest set for the region.
- Improved performance when opening large PKT files and changing properties in the Subassembly Composer.
- Fixed the issue that Assembly shows as AECC_ASSEMBLY in Civil 3D.
Catchments
- Improved the EPA-SWMM runoff method for Catchments by hiding the Routing Percentage field when not in use because the internal routing is set to direct.
- Fixed an issue that prevented the style selection being shown on the Catchment Properties.
Cloud Collaboration (BIM 360)
- Improved performance when opening a sheet drawing containing many sheet layouts.
COGO Points
- Fixed an issue in which Cogo Point Rollover Tooltip information was duplicated.
Corridors
- Fixed an issue of an incorrect counter in new corridor region names.
- Fixed an issue in which an incorrect value returned for QTOVolumeResult::CumulativeUsableVolume.
- Fixed an issue in which incorrect values displayed in the corridor volume report in the toolbox.
- Fixed an issue in which the elevation target did not apply when rebuilding a corridor when the elevation target was set through the API.
- Fixed an issue in which "Landscape" and "Portrait" were not translated in the dialog box when creating a slope stake report.
- Fixed a stability issue when deleting a material in the Section View Materials menu.
Cross Sections
- Fixed an issue in which a grip gizmo would not update its position accordingly when grip editing the station slider.
- Fixed an issue in which alignment child objects were being corrupted or removed, and not being carried over with the alignment when removed/moved out of a site.
- Fixed an issue in which tooltips would display duplicate/odd properties after applying changes in CUI for these tooltips.
- Fixed an issue where point markers from the Code Set Style were inserted 1 meter lower on the return segment of a U-shaped alignment in Civil 3D.
Dynamo
- Fixed an issue where the BaselineRegion.SetOffsetTargetFrequency node would not correctly set the value for offset target geometry points.
- Fixed an issue where the Baseline.AddRegion node would display a warning when adding a new region before another.
- Fixed an issue where the Parcel.UserDefinedProperties node would produce a warning when the UDPs of the parcel were used in a label expression.
- Fixed an issue where the Catchment.RunoffMethod node did not properly return the EPA SWMM and Santa Barbara Urban Hydrograph runoff methods.
- Fixed an issue where labeling nodes did not support child label styles.
- Fixed an issue where the CogoPoint.SetLabelStyle node would not allow for setting the label style to .
- Fixed an issue where label creation nodes would not work correctly when the drawing contained invalid default label styles.
- Fixed an issue where the Block.Extents node would incorrectly return null when the block definition contained certain types of invalid geometry.
- Fixed an issue where the Profile.BySurface and Profile.ByStationsElevations nodes would return null when the profile object layer did not exist in the drawing.
- Fixed an issue where the saved value for the Choose Object Type dropdown node would vary between locales.
- Fixed an issue where the Civil3D_FenceFromFeatureLine sample graph had an incorrect workspace scaling factor.
Feature Line
- Fixed a stability issue that could occur when undoing a trim command on a feature line.
- Fixed an issue in which the contextual ribbon for the feature line did not update after selecting and switching between different types of feature lines.
- Fixed an issue where there are 2 select options for feature line context menu.
- Fixed an issue that element orders are inconsistent when export feature lines to Landxml multiple times.
- Fixed an issue where Civil3D would stop working after trim and undo for several times.
- Fixed an issue where Civil3D would stop working at grip editing or moving a feature line. To apply the fix, need run audit command first.
- Fixed an instability issue when delete proxy feature lines or export to AutoCAD.
- Fixed an instability issue when import and export feature line from LandXML files.
Grading
- Fixed an issue in which grading highlights could not be removed after using the Grading Volume tools.
- Fixed an issue in which the Grading Creation tool table border did not adjust to the size of the grading creation tool dialog.
- Fixed an issue in which the Entire Group radio button was not shown as selected in the Grading Volume Tools bar.
- Fixed an issue that Civil3D would stop working when a Grading is built based on dynamically linked corridor Feature Lines.
- Fixed an issue that Civil 3D freezes when user create grading area using "Grade to elevation" criteria from outer boundary of grading area and three PG topology issues.
Gravity Pipes
- Fixed an issue in which structure/pipe label leaders were unexpectedly generated.
Miscellaneous
- Improved performance when saving a drawing with the toolspace turned on.
Model Viewer
- Fixed several issues in which right-click contextual menus did not display as expected.
- Fixed a stability issue that could occur when editing an invisible object and then closing the Model Viewer.
Parcels
- Fixed a stability issue that occured when creating a parcel segment from a line after several grip edits.
- Fix an issue in which the parcel segment label displayed information for the entire alignment after moving an alignment to the same site as a parcel.
Performance
- Fixed an issue in which objects became visible in the Model Viewer after editing even though their visibility was turned off.
Pressure Pipes
- Fixed an issue in which a pressure pipe would not follow STB Description Style Settings.
- Fixed an issue in which a pipe hatch would unexpectedly generate.
- Fixed an issue in which "Cut Length" pressure pipe 2D length calculation was not accurate.
Profile View
- Fixed an issue in which changing the default style in the ProjectObjectsToProf setting was not reflected.
- Fixed an issue in which the Profile View Depth Label Reference was displayed incorrectly.
Project Explorer
- Fixed a stability issue that could occur when Project Explorer encountered a profile associated with more than one alignment.
- Fixed a stability issue in Project Explorer when a feature line was assigned to a site, but was also encountered as a siteless feature line.
- Fixed an issue that part of surface isn't created from grading sometimes, need rebuild grading surface if data is already corrupted.
Rail Design
- Fixed a localization issue in which the Italian version strings of the Turn Out Catalog were truncated.
- Fixed issue in which some values of Curve Radius and Lateral Acceleration labels at the beginning and end of an alignment would not display.
- Fixed a stability issue that could occur during design speed modification.
Section Views
- Fixed an issue where some objects projected to Section Views were displayed with an offset.
- Subassembly Composer
- Fixed an API issue in which rearranging subassemblies inside an assembly would cause incorrect subassembly geometry results in the canvas.
Surfaces
- Fixed an issue that LandXML Export multiple alignments when corridor is in folder.
- Fixed an issue where a GEOTIFF file cannot be loaded when using the 'Create Surface from DEM' feature.
Survey
- Fixed an issue that prevented survey figures from being copied and pasted using box-select.
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.
Autodesk AutoCAD -Whats New feature in Civil 3D 2026? model viewer | Dynamic Design Creations
Explore the latest features of Autodesk Civil 3D 2026 in this detailed walkthrough brought to you by Dynamic Design Creations. In this video, we highlight the most exciting updates, including the powerful Model Viewer, performance improvements, and productivity-enhancing tools designed for civil engineering professionals.
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Conclusion:
Optimize your engineering workflows with Autodesk Civil 3D 2026.1 Update. Download now and take advantage of the latest features and improvements to boost productivity and design accuracy.
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