Carlson Hydrology


Carlson Hydrology is a comprehensive, yet easy-to-master hydrologic and hydraulic software solution that works simply in the commonly user CAD environment of polylines, text and layers. Carlson Hydrology provides site drainage and runoff analysis, plus storm drain system design and drafting, and pond design and sizing.

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Complete Hydrologic and Hydraulic Solution

Carlson Hydrology can be purchased as a standalone module or as part of the Civil Suite which also includes Survey, Civil and GIS. It can run standalone with the included license of IntelliCAD or on top of a separately purchased license of full AutoCAD. All Carlson Software purchases will be delivered by email with your new serial number and download instructions within two business days.

Carlson Hydrology has full hydrology and hydraulic design capabilities but is also tightly integrated with HydroCAD. The features in Carlson Hydrology are comparable to the structure and pipe utility design features in programs such as: DCA/Softdesk/Land Desktop, Civil 3d, Hydraflow, Eagle Point and TerraModel.


From Carlson Software, you get complex calculations of surface flows integrated with the DTMs:

  • Tap extensive libraries on rainfall, inlets, manholes, outlets
  • Calculate inlet intercepted and bypass flows, gutter spread and depth, pipe flow depth and velocity, and hydraulic and energy grade lines
  • Get warnings for collisions, excessive pipe lengths, insufficient cover, lack of slope, excessive flow rates, and more
  • Track runoff and analyze watershed – choose entire area or the watershed above a point such as a catch basin
  • Design ponds, culverts, channels and outlets
  • Draft sewer pipe dynamically in plans, profiles and 3D

New for 2022

2022 General Carlson Software Improvements

AutoCAD 2022Added support for this new version.
IntelliCAD 10.1Improved speed and new features like sheet sets with the Publish command.
ToolbarsAdded over 30 new toolbar icons and a new ribbon for GeoTech.
Open Drawings Map Added method for custom properties for drawing records and method to store a drawing database on a shared network location. From the Map view, added function to open Windows File Explorer for the drawing’s project folder.
Settings ServerAdded method to copy data files into project folders.
Project Data Sub-FoldersAdded separate Program Settings folder for settings files.
Data DepotAdded details to the history log and the ability to restore a previous version of a data file. Adding files to Data Depot supports working from project level with controls on which files to add.
Carlson ConfigureAdded setting to control font used for dialogs.
Select CAD Default SettingsNew command to choose classic or modern CAD user interface settings.
Drawing CleanupAdded functions to remove duplicate text and to remove unused registered apps.
Import Polyline FileAdded method for locating by station/offset values from the file.
Drawing Inspector For polylines, added reporting of current position distance. For centerline polylines, added reporting of spiral data.
Draw MText In many commands that create MText, added an option to set the Text Frame to draw a box around the text.
Translate LayersAdded method to import layer names from the drawing.
Line Up Text Added method to pick two points to define angle, option to respace and option to use text for alignment reference.
Arrowhead with LineNew command to draw a two point leader with an arrowhead.
Boundary PolylineAdded option to create 3D polyline.
Shrink-Wrap Entities Added options to ignore zero elevation entities for input, to elevate zero elevation vertices, and to erase the input entities.
Add Intersection PointsAdded option to average elevations at intersection within a tolerance.
Draw Label For Companion LineworkNew command for Draw To Standard to create a label using properties by layer.
Draw Standard Item by Quick KeyNew command to create entities for Draw To Standard by typing a quick key instead of dialog list selection.
Reports For PDF reports, added option to make PDF report files read-only. For Report Formatter, new option to put text lines at the bottom of the report and added function to sort the list of available fields.
3D ViewerAdded zoom extents function.
Angle InfoAdded ability to handle 3D angles.
Layer IDAdded option to label the layer name.
Command SearchAdded reporting of toolbars for the commands.

2022 Improvements - Hydrology

Rain Lookup TableNew command to store custom rain events.
Merge WatershedsNew command to combine the polyline perimeters of neighboring watersheds.
Time of ConcentrationAdded Kerby-Kirpich method.
Channel RoutingAdded Muskingom-Cunge and Modified Puls methods.
Pond ExfiltrationAdded functions to save and load parmaters to a .pdx file.
Drop Pipe SpillwayAdded lookup table for entrance loss coefficient. Added functions to save and load parameters to a .drop file. Added PDF report and function to draw diagram to the drawing.
Pipe Culvert DesignAdded report option for stage-discharge graph and option to draw HGL on pipe detail graph. Added support for Muskingom-Cunge method.
Advanced Weir DesignAdded functions to save and load parameters to a .weir file.
Orifice DesignAdded functions to save and load parameters to a .outlet file.
Multiple Outlet DesignAdded PDF report method with diagram and stage-discharge graph.
Sewer Network Added ability to automatically set inlet as on-grade or sag based on the surface. Added support for Inlet Control Devices to limit intercepted flow. Added support for structures with underdrains. Added new yard inlet structure. For SCS rainfall lookup, added methods to choose from lookup table, rain map or NOAA. Added method to round elevations by decimal precision. For draw plan view, added setting for direction of pipe polylines as upstream or downstream. For data table, added ability to control which structures to include in the table. For Review Sewer Network Links, added a method to reassign the data files. Added pipe thickness to editor and reports. Added setting for having raised rim heights. Added a new Line Name field for each structure.
Collison CheckAdded option to draw 3D lines between the crossing pipes along with 3D text for 3D viewing. Added coloring of pipe portions that have conflicts. Added report of minimum horizontal and vertical clearance. Added method to check for collision with a surface model. Added option to color pipe segments with a conflict.
Compare Sewer NetworksNew command to report differences between two sewer network models.
Draw Sewer ProfileAdded ability to draw profiles for normal and critical depth lines.
HydroNet Explorer Added support for circular pipe reach and culverts. Added support for the Clark and Snyder hydrograph method. For draw plan view, added options to create MText labels, draw connection lines, use default symbols and save/load settings. For reports, added method to control the order of elements.
Utility Network For pipe labels, added settings to control offset from line and layer for labels. For creating profile at depth, added method to create streamlined profile with min number of profile points and ability to set max depth and min segment length. Added report function to check pipe depths and min/max cover. Added a description field for each utility with option to label in Draw Profile and Draw Sections. For laterals, added location by offset and slope.
Pressure Pipe NetworkUpgraded calculation engine to EPANet 2.2. Added ability to set tank level to create specified pressure. Added ability to add multiple connections or laterals at a time with a specified station interval and demand. Upgraded interface for setting up demand patterns. Added ability to draw symbols for valves in plan view.
Pipe Network IDNew command to pick a pipe network entity and report which pipe network model it belongs to.
Review Network Drawing LinksNew command to review pipe network entities in the drawing and report network files with ability to reassign network files.
HEC RASAdded method to output a cross section of the water level. Added support for version 6.0.


System Requirements

For Carlson’s CAD-Based Products

Note: Carlson products installed on top of the CAD products of IntelliCAD or AutoCAD, are subject to the same requirements as the CAD engine itself. Please follow the requirements for the CAD platform listed below and allow an additional 750 MB of hard-drive space for the Carlson application.

Carlson 2016-2018 with IntelliCAD 8.x

  • Compatible with 32 or 64 bit Windows Vista, 7, 8, 8.1, and 10
  • For hardware requirements, see Carlson 2013-2015* below

Carlson 2013-2015* with IntelliCAD 7.2

*Starting with 2013 build 130120

Intel® Pentium® 4 or comparable (minimum), Intel i7 or at least Intel i5 or comparable (recommended). Due to the variety of processors on the market, one can use to do comparative analysis. While the overall processor score matters, the single thread performance is of the most interest.

  • 32-bit Windows 7-8.1: 1 gigabyte (GB) of RAM minimum for, 4 GB recommended.
  • 64-bit Windows 7-8.1: 2 GB of RAM minimum for, 8+ GB recommended.
  • Windows Vista: 1 GB of RAM minimum, 4 GB recommended.
  • Windows XP: 512 megabytes (MB) of RAM minimum, 2 GB recommended.

Graphics card compatible with OpenGL Version 1.4 or higher:

  • Recommended are desktop graphics level discrete (not integrated cards like Intel HD) graphics cards.
  • Preferably Nvidia Geforce due to their more consistent driver support.
  • Discrete ATI/AMD cards will be adequate, but ATI’s driver support has been spotty and user is frequently deferred to the computer manufacturer for support.
  • Professional Nvidia Quadro cards are not currently recommended due to driver issues.
  • Powerful gaming cards are not required and probably would not provide as much benefit as investment in more memory or better CPU

Carlson 2012 and earlier with IntelliCAD 7.1 and 6.x based products

  • Windows® XP, Windows® Vista, Windows® 7
  • Intel Pentium® or more powerful processor
  • 64-bit machines are supported, but application itself is 32-bit
  • 1 GB RAM (minimum), 4 GB recommended (for complex drawings)
  • 400 MB of free hard disk space (1.2 GB Total, see Note above)


Please visit the AutoCAD System Requirements page for current specifications which are subject to change without advance notice.

Please visit the Autodesk summary of the Operating system compatibility for AutoCAD (Autodesk Bulletin TS14078105) for historical references between AutoCAD and its supported operating system(s).

Please see Note above for hard disk space requirements for the Carlson application.

Embedded AutoCAD® OEM Engine

Carlson solutions based on AutoCAD 2018 Embedded

Takeoff R10 / Survey OEM 2018

Please note the CPU compatibility below: older AMD CPUs like Athlon XP+ do not support SSE2 technology and can not run Embedded AutoCAD 2018 products.

  • Microsoft Windows 10 (64-bit only); Microsoft Windows 8.1 with Update KB2919355 (32-bit & 64-bit); Microsoft® Windows® 7 SP1 (32-bit & 64-bit)
  • 4 GB RAM (minimum), 8 GB (recommended)
  • 2 GB free disk space for installation
  • 1360 x 768 (1920 x 1080 recommended) with True Color
  • Windows Internet Explorer® 11 or later
  • Install from download or DVD

Carlson solutions based on AutoCAD 2013 Embedded

Takeoff R6, R7, R8, R9 / Survey OEM 2013, 2014, 2015, 2016, 2017

Please note the CPU compatibility below: older AMD CPUs like Athlon XP+ do not support SSE2 technology and can not run Embedded AutoCAD 2013 products.

  • Windows® 8 and 10 Standard, Enterprise, or Professional edition (8 requires installation of AutoCAD LT 2013 Service Pack 2); Microsoft® Windows® 7 Enterprise, Ultimate, Professional, or Home Premium edition (SP3 or later) with an Intel® Pentium® 4 or AMD Athlon™ dual-core processor, 3.0 GHz or higher with SSE2 technology.
  • 1 GB RAM (minimum), 8 GB (recommended)
  • 1.4 GB free disk space for installation
  • 1,024 x 768 VGA display with true color
  • Internet Explorer 7.0 or later
  • Install from download or DVD

Carlson solutions based on AutoCAD 2010 Embedded

Takeoff R4, R5 / Survey OEM 2010, 2011, 2012

Please note the CPU compatibility below: older AMD CPUs like Athlon XP+ do not support SSE2 technology and can not run Embedded AutoCAD 2010 products.

  • Microsoft Windows 7, or,
  • Windows Vista, SP1 or later (Enterprise, Business, Ultimate, Home Premium) operating system, with,
  • Intel Pentium 4 processor or AMD Athlon dual-core processor, 3.0 GHz or greater with SSE2 technology
  • 1 GB RAM (minimum), 8 GB (recommended)
  • 850 MB free disk space for installation
  • 1024 x 768 VGA display with true color
  • Microsoft Internet Explorer 7.0 web browser or later
  • DVD drive


  • Microsoft Windows XP Professional or Home Edition operating system (SP2 or later), with,
  • Intel Pentium 4 or AMD Athlon dual-core processor, 1.6 GHz or greater with SSE2 technology
  • 512 MB RAM
  • 850 MB free disk space for installation
  • 1024 x 768 VGA display with true color
  • Microsoft Internet Explorer 7.0 web browser or later
  • DVD drive

Carlson solutions based on AutoCAD 2007 Embedded

Takeoff R2, R3 / Survey OEM 2007, 2008, 2009
  • Microsoft Windows 7, or,
  • Windows Vista, or,
  • Windows XP Home or Professional SP1 or better, or,
  • Windows XP for Tablet PC SP2, or,
  • Windows 2000 SP3 or better
  • Pentium III 800 minimum, Intel Pentium IV recommended
  • 512 MB RAM
  • 550 MB free disk space for installation
  • 1024 x 768 with True Color
  • Microsoft Internet Explorer 6.0 SP1 or higher
  • CD-ROM drive
  • Mouse, trackball, or compatible pointing device

Carlson solutions based on AutoCAD 2004 Embedded

Takeoff R1 / Survey OEM 2004, 2005, 2006
  • Microsoft Windows XP (Professional, Home Edition, or Tablet PC Edition), or,
  • Windows 2000, or Windows NT 4.0 (SP6a or later)
  • Pentium III 800 minimum, Intel Pentium IV recommended
  • 256 MB RAM
  • 300 MB free disk space for installation
  • 1024 x 768 VGA with true color (minimum)
  • Microsoft Internet Explorer 6.0
  • Mouse, trackball, or compatible pointing device
  • CD-ROM drive

Free Support

Carlson Software Works For You

A customer’s relationship with Carlson Software goes beyond simply purchasing our software – with Regional Managers throughout the country, free technical support for life, and training options for any budget – we’ve got you covered!

Direct Technical Support
  • Hours: Monday – Friday, 8:00 AM – 6:00 PM (EST)
  • E-mail: moc.wsnoslrac@troppus
  • Problems/Suggestions: Send in a report
  • Telephone: 606-564-5028
  • Fax: 606-564-6422