v3.0.0.43\/44 \u2013 March, 2026<\/h2>\n\n\n\nWhat’s New<\/h3>\n\n\n\n
Enhanced license management. This is a required update<\/strong> that will enable the software to switch to node-locked activations and deactivations. Node-locked licenses associate your software with a specific machine, allowing administrators to monitor who is currently active. This new licensing system will be fully implemented by the end of March 2026 and will necessitate that existing active users re-register, which will attach the machine name and Windows username to the license key. This is a one-time activation and will not count against the total permitted activations.<\/p>\n\n\n\n If your software fails to register it may mean that it has not been updated to the latest version. Click [Use Trial] instead. Then close and reopen the software to allow it to automatically update.<\/p>\n\n\n\n Version 3.0.0.41 introduced a greatly enhanced feature for conducting a critical storm duration analysis<\/strong>. You can compute your entire model with as many as seven designated design storms with just one click! Additionally, you can export the results to a CSV or text file and print a formal report as well. More info here…<\/a><\/p>\n\n\n\n Version 3.0.0.42 added the Custom Storm distributions to the list of available storms to use in your analysis.<\/p>\n\n\n\n R-Tank\u00ae MD by Ferguson Waterworks was added to the “By Manufacturer” list of built-in UG Chambers. Single (1), Double (2), Triple (3) and Quad (4) were included.<\/p>\n\n\n\n Hydrology Studio 2026 – Mandatory update includes miscellaneous bug fixes, security enhancements and user interface improvements.<\/p>\n\n\n\n 1. The Malcom Small Watershed Hydrograph<\/a> method was added to the runoff hydrograph types.<\/p>\n\n\n\n 2. The primary culvert for detentions ponds will now allow elliptical-shaped pipes.<\/p>\n\n\n\n 3. The ability to transfer discharge data<\/a> from any pond outflow device to the User device. This enables more than one culvert or multi-stage structure in a single pond.<\/p>\n\n\n\n 1. Updates to underground chamber “By Manufacturer” products and specifications.<\/p>\n\n\n\n 2. The precision for Curve Numbers (CN) has been increased from whole numbers “0” to two decimals “0.00”.<\/p>\n\n\n\n 3. The Batch Run feature will now automatically recompute your entire model, all hydrographs, rather than from Hydrograph 1 to the selected hydrograph.<\/p>\n\n\n\n 1. The project filename has been added to the printed reports.<\/p>\n\n\n\n 2. Security (code signing) update. A code signing certificate is a digital certificate that verifies the identity of a software developer and the integrity of their code. It’s used by developers to digitally sign software, drivers, and executables such as Hydrology Studio. 1. Updates and additions were made to the list of available manufactured underground chambers. The brand Triton was changed to Xerxes and a new model from ADS, StormTech SC-800, was added. <\/p>\n\n\n\n 2. An error involving the reported Total Contributing Area on Junctions that included a Channel Reach was corrected.<\/p>\n\n\n\n 1. A newly introduced feature allows you to quickly modify the size of your pond. This functionality is particularly beneficial for new designs, where an initial pond size was established using contours or total storages, only to discover later that the freeboard is either too high or insufficient. With this feature, you can easily modify the contours in increments of +\/- 1 or +\/- 10 percent with a single mouse click, ensuring the optimal size for your new pond. Learn more here.<\/a><\/p>\n\n\n\n 1. This is an exiting new feature that offers Animated Flow Paths<\/strong> to your pond outlet structure. Animated flow paths are streamlines that indicate the path of flow between your pond and the outflow culvert. These path lines are drawn between orifices, weirs, restrictors, etc. all the way through your culvert giving you a clear visual picture of how and where the inflow\/outflow is moving. Flow paths will help confirm your multi-stage outlet structure is set up the way you expect.<\/p>\n\n\n\n The Flow Paths feature is activated via a new checkbox on the toolbar above the Structure schematic. More info here<\/a>.<\/p>\n\n\n\n 2. While viewing the Charts tab at the Main Window, the Label Toggle button<\/strong> will now include Hydrograph No.; Hydrograph Name; Hydrograph No. & Name; and No Label for the hydrograph icons.<\/p>\n\n\n\n 3. The Pond Report<\/strong> indicates whether a specific pond outlet is Multi-stage (m) or Independent (i). The previous versions only noted if they were multistage using an asterisk (*).<\/p>\n\n\n\n <\/p>\n\n\n\n 1. Enhanced outputs for volumetric detention pond design.<\/strong> When the Critical Time Span settings have been activated in the Project Settings, you will be able to view the following outputs:<\/p>\n\n\n\n For more info on volumetric “Critical Volume”, please see: Volumetric Detention Pond Design<\/a><\/p>\n\n\n\n 2. Added additional graphs to the Interconnected Pond Charts<\/strong> to include additional inflow hydrographs into the Lower Pond.<\/p>\n\n\n\n 3. Improved visuals on Pond Reports.<\/strong> When selected from the Reports Menu, the plots will now show lines on the Stage-Storage and Stage-Discharge plots indicating the Maximum Storage used and Maximum discharge for each return period.<\/p>\n\n\n\n <\/p>\n\n\n\n Corrects an issue involving interconnected pond routings, only when the lower pond was utilizing a Circular Culvert Restrictor Plate and its Pond Number was not Pond 1.<\/p>\n\n\n\n Improved subscription license key management.<\/p>\n\n\n\n Correction to the graphics in reports when printed to a PDF file using Microsoft PDF printer driver. The Hydrograph plots, IDF Curves and other graphics will no longer be filled with a solid color, rather will be transparent.<\/p>\n\n\n\n 2. Minor cosmetic user interface updates.<\/p>\n\n\n\n 3. Increased the precision on drainage area inputs to three decimal places to better accommodate smaller-sized projects.<\/p>\n\n\n\n 1. Added the option to specify a circular orifice to the Detention Pond Culvert Restrictor Plate. Earlier versions only allowed a rectangular plate.<\/p>\n\n\n\n 2. The software will no longer apply a submerged weir analysis on Riser structures. This eliminates unnecessary oscillations in the Stage-Discharge curve that typically appears for very short periods.<\/p>\n\n\n\n 3. Added an option to view the numerical output along with the detention pond Structure, Plan and Profile plots. Select any row on this Expander-based table to view the corresponding water surface elevation.<\/p>\n\n\n\n 1. Corrected an issue that prevented a Pond’s bottom contour area from updating when switching to other ponds via the Pond Number drop-down list box.<\/p>\n\n\n\n 2. Added the Center of Mass Detention Time to the Chart display for Pond Route hydrographs. Previously was shown only on printed reports.<\/p>\n\n\n\n 3. Corrected an issue dealing with failed interconnected pond routings. Occurred when the lower pond contained a multi-stage outlet device and when the Pond No. for the lower pond was not 1.<\/p>\n\n\n\n 1. You’ll now have the option to utilize the Weighted Volume method, as well as the Weighted CN method when employing Composite CNs. Learn More<\/a>.<\/p>\n\n\n\n 2. Updated manufactured underground chamber specs.<\/p>\n\n\n\n 1. You can now view Plan and Profiles of your detention ponds from the Main Window Charts tab. A feature that previously was only available while in the Pond Designer. A side toolbar button has been added that toggles between the hydrograph plot and the detention pond plot. While displaying the optional numerical grid, you can select a row on the grid and the plot will update to indicate the selected the water surface elevation in the pond. Use the arrow keys to quickly see a simulation of Time vs Elevation. This new feature also provides plots of both upper and lower ponds for interconnected pond routings.<\/p>\n\n\n\n 2. Fixes an issue that caused the program to immediately close after a program update.<\/p>\n\n\n\n 1. Pond routing options have been enhanced and simplified. You can now set tailwater elevations unique to each return period during detention pond routings.<\/p>\n\n\n\n 2. Look-up tables for Curve Numbers, Runoff Coefficients and Manning’s n values are now available at the hydrograph input screens so now you won’t need to visit this site to look them up.<\/p>\n\n\n\n 1. The Pond Outlet Structure Schematic and Pond Drawdown plot now indicates the maximum release rate(s) corresponding to the extended (Full Spectrum) detention volumes, WQv and CPv. This feature is very useful for designing outlet device sizes, elevations, etc., in order to satisfy the maximum allowed release rates at the Full Spectrum Detention volumes.<\/p>\n\n\n\n 1. The ability to import rainfall IFD and precipitation values from the Australian Bureau of Meteorology (BOM). Learn more…<\/a><\/p>\n\n\n\n 2. Trial Route feature displays when and where a failed routing occurs. This is now indicated in the Trial Route table in the Pond Designer and is shown on the Trial Route Plot as a yellow line. This line represents the progress of the outflow hydrograph. The end-point is where the routing stopped due to insufficient pond volume and\/or outflow capacity.<\/p>\n\n\n\n Plot indicates that the outflow hydrograph routing (yellow line) was able to progress up to Time 3.45 hours at an Outflow of 20 cfs. Learn more…<\/a><\/p>\n\n\n\n 1. Open legacy Hydraflow Hydrographs .gpw project files. Now you’ll be able to bring forward your old gpw project files. Hydrology Studio will open any .gpw file from version 2007 forward including those from Autodesk\u00ae Civil 3D\u00ae Extension. This new feature will make transitioning from the old to the new… very easy!<\/p>\n\n\n\n Some restrictions apply. More information can be found here.<\/a><\/p>\n\n\n\n 1. Custom Labels for Basin Model: This new version allows you to annotate your Basin Model with unique text labels. You can choose from a variety of fonts, font sizes and colors. Read more here…<\/a><\/p>\n\n\n\n 2. Basin Model Snap to Grid. You can now force the hydrograph icons to align themselves to a grid. This helps for a clean layout when modifying their positions other than the default layout. In addition, you can select a grid size from a drop-down list box.<\/p>\n\n\n\n 3. The Basin Model Icon Layout Lock and Unlock. A new toggle button on the Basin Model toolbar allows you to freeze the layout to prevent unwanted changes. When locked, the hydrograph’s icon placement will be preserved and protected from any inadvertent moves.<\/p>\n\n\n\n
In addition to managing your license directly from the software, you will have the capability to deactivate license keys remotely through the \u201cMy Account\u201d portal (View Licenses -> Manage Sites). This will help recover lost seats, e.g., when a PC is decommissioned without prior deactivation.<\/p>\n\n\n\n
\n\n\n\nv3.0.0.41\/42 \u2013 January & February, 2026<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/image-1024x620.png\")
<\/figure>\n\n\n\n
\n\n\n\nv3.0.0.40 \u2013 November, 2025<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.39 \u2013 October, 2025<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.38 \u2013 May, 2025<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.36\/37 \u2013 March, 2025<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.35 \u2013 February, 2025<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
Code signing certificates assure users that the code they’re downloading is genuine and hasn’t been tampered with. Code signing certificates are used for many types of Windows-based software and applications. From time-time we are required to update Hydrology Studio’s certificate(s). This update facilitates that.
During the update download you might be presented with the following Windows Defender screen. Please click “More info”. Then click [Run anyway]. The update will proceed.<\/p>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/Install1.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2025\/02\/image.png\")
<\/figure>\n\n\n\n
\n\n\n\nv3.0.0.34 \u2013 November, 2024<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.33 \u2013 August, 2024<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.32 \u2013 March, 2024<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2024\/03\/Animation1-1024x568.png\")
\n\n\n\nv3.0.0.30\/31 \u2013 January, 2024<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2023\/12\/NewStageStorageReport-1024x609.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2023\/12\/NewStageDischargeReport-1024x586.png\")
<\/figure>\n\n\n\n
\n\n\n\nv3.0.0.29 \u2013 November, 2023<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.28 \u2013 October, 2023<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nV3.0.0.27 \u2013 February 2023<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nV3.0.0.26 \u2013 July 2022<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.23\/24\/25 \u2013 April 2022<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.22 \u2013 February 2022<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
<\/figure>\n\n\n\n![\"This](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/Install2.png\")
<\/figure>\n\n\n\n
\n\n\n\nV3.0.0.21 \u2013 December 2021<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
<\/li>\n<\/ol>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/RainfallTab-1024x192.png\")
\n\n\n\nV3.0.0.20 \u2013 July 2021<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.19 \u2013 April 2021<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.18 \u2013 March, 2021<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.17 \u2013 January, 2021<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.15\/16 \u2013 June, 2020<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.14 \u2013 March, 2020<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.13 \u2013 September, 2019<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nV3.0.0.12 \u2013 August, 2019<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n
\n\n\n\nv3.0.0.11 \u2013 July 2019<\/h2>\n\n\n\n
<\/i>What’s New<\/h3>\n\n\n\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/Circular-Orifice-Plate-1024x663.png\")
\n\n\n\nv3.0.0.7-10 \u2013 May 2019<\/h2>\n\n\n\n
<\/i>What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.6 \u2013 March 2019<\/h2>\n\n\n\n
<\/i>What’s New<\/h3>\n\n\n\n
\n\n\n\nv3.0.0.5 \u2013 February, 2019<\/h2>\n\n\n\n
What\u2019s New<\/h3>\n\n\n\n
\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/BuiltInStorms.png\")
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/GridOn.png\")
\n\n\n\nv3.0.0.4 \u2013 January 2019<\/h2>\n\n\n\n
<\/i>What’s New<\/h3>\n\n\n\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/PondProfileCharts-1024x621.png\")
<\/figure>\n\n\n\n
\n\n\n\nv3.0.0.0\/1\/2\/3 \u2013 January 2019<\/h2>\n\n\n\n
<\/i>What’s New<\/h3>\n\n\n\n
\n\n\n\nv2.0.0.61 \u2013 December 2018<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv2.0.0.59\/60 \u2013 November 2018<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/SEETRIALROUTE.png\")
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/TrialRouteFailure2.png\")
\n\n\n\nv2.0.0.58 \u2013 November 2018<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
\n\n\n\nv2.0.0.56\/57 \u2013 October, 2018<\/h2>\n\n\n\n
What’s New<\/h3>\n\n\n\n
![\"Detention](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/ErrorHelp.png\")
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/ReportsMenu.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/ModRatTrials-1024x651.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/ReturnPeriodSettings2.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/12\/ReturnPeriodSettings.png\")
<\/figure>\n\n\n\n![\"Detention](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/PondPlan-1024x711.png\")
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/10\/PondProfile-1024x707.png\")