This is Better Storm Sewer Design Software

Looking for a stand-alone storm sewer design program with an intuitive user interface? Stormwater Studio is easy-to-use storm sewer design software with powerful features. Like automated design & analysis capabilities; true, energy-based HGL calculations; user definable design constraints; automatic flow calculations by the Rational method; built-in IDF curves; cutting edge profile plots; complete HEC-22 inlet design and analysis with automatic bypass & carryover calculations; nine inlet types with compound cross slopes and local depressions. Finish your projects with professional-looking reports that make you look your best.

Easy to Learn

With virtually no learning curve you’ll be up and running in minutes. Draw your pipe system on-screen or import lines from CAD. Then add data right there in a smart grid-style editor. Click the compute button and a split second later you’ll be presented with rich graphical profiles, surface views and professional looking reports. It’s that easy!

Easy to Use

Up to 200 storm sewer lines and inlets come standard including multiple systems and outfalls. Move, insert and delete lines as you please. An undo command is right there to rescue you from inadvertent changes and mistakes. Compute results the way you like it and present it in a fashion guaranteed to amaze your colleagues and calm reviewers.

Easy to Love

With Stormwater Studio, you’ll never get blind-sided. It’s designed to highlight pipes on your plans that fail to meet your specific design criteria, ensuring nothing gets left behind.

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Everything You Need to Work Smarter

When hydraulic grade line calculations have to be done right, Stormwater Studio is your go-to model. It handles all flow regimes including partial depth (free surface), full, surcharged, supercritical flow with hydraulic jumps. Junction loss calculations follow the latest HEC-22, Third Edition procedures. Specify any starting tailwater elevation as well as existing invert elevations, pipe sizes or slopes. It also has many automated design options. Plus, the graphic output is the best in the industry!

Fine-tune Your Designs in Real Time

“What-if I changed that 36-inch to a 30? How would that affect the HGL upstream?” Stormwater Studio answers questions like that and many other design “What-ifs”… in real time; during the calculations! An intuitive, interactive tool-bar provides the means right on the profile drawing. Work with a single line or an entire branch. Get it done right the first time. A real breakthrough in value engineering your storm sewer designs.


Analyze Existing Systems

Use Stormwater Studio to model and critically analyze existing storm sewer systems. Import them from LandXML, DXF or simply draw the lines in yourself. Up to 200 lines with multiple outfalls can be included. There are a host of options when computing as well as notifications pointing you to any weak spots in the system. Make changes and recommendations for improvements.

Accelerate Your Modeling Processes with Automation

Plug in drainage areas, Rational method runoff coefficients and inlet times. Stormwater Studio does the rest. Tc and rainfall intensity are computed automatically. Additional known Qs can also be inserted or extracted anywhere in your system. Optionally compute inlet times by a built-in TR55 calculator as well as composite runoff coefficients.


Develops IDF Curves Anytime, Anywhere

Develops Intensity-Duration-Frequency (IDF) curves with up to 8 return periods. Specify equation coefficients for both FHA or third-degree polynomial, enter existing intensities, or import data from Hydro-35 or NOAA Atlases.

Once and Done

What’s even better is that there’s no need to repeat. Set up your rainfall data once and forget about it. Stormwater Studio automatically reloads your IDf curves for each and every project, so you don’t have to.

Models a Variety of Inlet and Junction Types

These built-in inlets come with user-definable defaults and include curb (horizontal or inclined throat), grate, combination curb & grate, drop-curb, drop grate, headwall, generic, manhole or none. Inlets can be set in sag or on-grade locations with compound gutter cross-slopes and local depressions.


Stay Ahead of the Pack with the Latest Methodologies

With Stormwater Studio you’ll get the latest HEC-22, Third Edition technology for junction loss calculations. All inlet calculations comply with Federal Highway Administration (FHWA) Hydraulic Engineering Circular 22 (HEC-22, Third Edition) with bypass & carryover flows.

Bypass flows can be directed offsite or to any other inlet in the project including upstream inlets and other systems. Computes both inlet and roadway gutter flow depths and spread widths.

Any Line can be an Open Channel!

This latest feature will come in handy for those times when your system has pipes that outfall into open channels and then re-enter downstream. Stormwater Studio can model trapezoidal, rectangular and v-shaped channels. These open channels can be placed anywhere in your system.

You’ll Look Good with Superb Graphics

Just like other lines in your system, Stormwater Studio employs widely used energy-based calculation methods for open channel hydraulics. It can handle any flow regime including subcritical and supercritical flow with hydraulic jumps. Accurate profiles and surface drawings are automatically produced and included in your reports.



Add Utility Crossings to Your Model

This one, critical feature will pay for your new software… tenfold. It allows you to add utility crossings such as as water mains, gas lines, even other sewers to your model. The software is on constant alert for crossing intersections and potential conflicts with your storm sewer. Elevation conflicts are instantly highlighted on your plan.

Automatically Included in Profiles

Utility crossings are automatically included on your profile plots. It adds the computed vertical clearance, dimensions it, and notes it on the drawing legend. Use the Interactive Toolbar to raise and lower your storm sewer lines to get the clearances just right.

With this feature you’ll rest at night knowing your design work is first-rate and error-free.

Model Broken-back Culverts

The ability to include open channels and pipes without structures make Stormwater Studio very versatile. Easily model broken-back culverts with or without drop structures.

Watch how the water surface transitions from subcritical flow to critical flow, to supercritical and finally to an energy dissipating hydraulic jump where velocities are returned to normal.

Model Inverted Siphon Culverts

Have a utility crossing under your roadway? No problem! Stormwater Studio can also model Sag culverts, often called “inverted siphons”. A broken-back “Sag” culvert offers the advantage of providing adequate vertical clearance for the pipe under the roadway pavement and subgrade. This insures the hydraulic grade line stays out of harms way.


Model Flow Diversions

Add flow splits or diversions at any junction in your model. No complicated procedure to follow, just draw the upstream end of your diversion line to the proposed diversion junction and the software takes care of the rest. Use this feature to divert flows off-site; to another separate branch; or re-introduce back into the system downstream.

Automatically Matches HGLs

Stormwater Studio manages the flow diversion hydraulics automatically. There’s no need for you to guess at the split proportions or come up with some rating curve. The software employs sophisticated calculation procedures that provide an exact balance between the diverted flows and the resulting hydraulic grade line. Rational method drainage areas and Cs (Sum CxA) entering the diversion are split in the same manner.

Cad Integration with LandXML & DXF Import & Export

Import pipe networks from LandXML or dxf-based pipe layouts. Add background maps from image or dxf files for easy plan layouts. Export your pipe systems back to LandXML. Save production-ready profiles to dxf with user-defined vertical and horizontal scales.

Opens Legacy Storm Sewers .stm files!

We’ve paved the road ahead and made transitioning from your old software to the new, easy.


“I feel very much at home in this software. You’ve done a great job. As a civil engineer with specific work in hydraulics and hydrology, I’ll be recommending your software to colleagues.”

Draw the System Right on Your Map

Take the guesswork out of plan layouts by importing background maps from a variety of sources. Once imported you can draw, or import, your storm sewer system over the top. Stormwater Studio supports DXF, PNG, BMP and JPG file types.


Geo-reference Your Background Map

Geo-reference your imported image-based background maps by specifying X, Y extents for the lower and upper corners.

You Demand Authority and Attention

And you’ll get it every time with Stormwater Studio’s reports. These exceptional looking print-outs include graphs and production-ready profiles, each designed to be easily understood by you while influencing your reviewers and peers.

In addition to a variety of pre-formatted reports, we’ve reserved two Custom reports. You can choose from over 80 variables to place in the columns you choose.

Print your plans, profiles and custom reports to letter (8.5 x 11) or Tabloid (11 x 17). Reports can also be exported as text or comma delimited files for importing into spreadsheets for further customizing.

List of Technical Highlights

Stormwater Studio’s technical abilities are vast. Here are some of the highlights.

Technical Features

• Interactively designs storm sewer systems up to 200 lines
• Models new and existing systems with user-defined methods
• User-definable starting tailwater elevation(s) or automatic
• Can automatically design pipe sizes, slopes and inverts
• Computes true energy-based Hydraulic Grade Line (HGL)
• Optionally balances Tc with HGL during calculations
• Handles partial, full and surcharged flow regimes
• Computes supercritical flow profiles with hydraulic jumps
• Uses Rational method and/or flows can be entered directly
• Computes Tc and rainfall intensities automatically
• User-defined Minimum Tc and Supress Tc
• Specify IDF equation coefficients or enter known intensities
• Imports from Hydro-35 or NOAA Atlases for IDF data
• Develops IDF curves with 8 return periods
• IDF correction factors can be specified for all frequencies
• Computes composite runoff coefficients
• Optionally computes Tc by TR55
• Clogging factors for inlets on grade and in sags
• Models and/or designs 9 inlet types
• User defined defaults can be specified for all inlets
• Compound cross-slopes and individual local gutter depressions
• Uses the latest HEC-22, Third Edition for access hole losses
• Over 20 user-defined design constraints including min/max pipes sizes, slopes, velocities, etc.
• Optionally highlights Lines on your Plan that don’t meet Velocity, Slope or Capacity constraints.

• Models circular, elliptical and box sections w/ multiple barrels
• Computes full flow capacities automatically
• Automatically computes inlet bypass & carryover flows
• Computes separate gutter and inlet spread widths
• Bypass flows can be directed to any other inlet
• Inlet calculations comply with HEC-22
• Imports/exports Pipe Networks from LandXML files
• Imports/exports system layouts from AutoCAD DXF files
• Imports .png, .jpg, .bmp and .DXF files as background maps
• Opens legacy Storm Sewers .stm files!

Output Features

• All printed reports, plans & profiles include Print Preview
• Exports all tabulated reports as text files
• Plots plan views, profiles, inlet plans and IDF curves
• Exports plan views and profile drawings to DXF files
• Displays and prints tabular DOT-Style, Inlet, HGL Calcs, Composite C Worksheets and Tc by TR55 reports
• Offers Customizable reports with user-definable column layouts
• Prints plans, profiles and custom reports to letter (8.5 x 11) or Tabloid (11 x 17) size


• U.S. Customary
• Metric

The Latest Programming Technology

While storm sewer calculation methods may be decades old, Stormwater Studio’s user interface is brand new.

Built on Windows Presentation Foundation (WPF)

Built from the ground up using Microsoft’s dot-net WPF (Windows Presentation Foundation) it provides a rich and clean presentation while taking advantage of today’s modern hardware. Built on top of Microsoft’s DirectX, WPF makes graphics rendering lightning fast while using device-independent pixels. Everything is automatically scaled up or down as the target PC changes. Learn more about WPF here.

System Requirements

Stormwater Studio is a stand-alone software product. Any off-the-shelf PC running Microsoft Windows 7, 8 or 10 will run Stormwater Studio. An internet connection is recommended for automatic updates and online help. No additional software is required.

Click-Once Installation

Stormwater Studio employs Microsoft’s “Click-Once” technology for easy, no-hassel installations. No zip files to open or messy procedures to follow. Just click the Download button and within seconds your new storm sewer design software is up and running. Program updates occur with a single mouse click. Download your free trial here.

Buy Stormwater Studio today and see for yourself just how
easy and exciting stormwater modeling software can be.