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Hydrologic & Hydraulic Modeling

Made Simple.

VO makes it easy to build accurate stormwater and watershed models faster, helping engineers save time and deliver projects with confidence.

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Why It Matters

Complex Tools Create Unnecessary Challenges.

Difficult to Learn

Steep learning curves require significant time and training before your team can confidently build and deliver models.

Too Many Applications

Switching between separate tools adds complexity, interrupts progress, and slows down your team.

Wastes Valuable Time

Repetitive setup, updates, and rework take valuable time away from solving engineering problems.

Project Delays

Slow scenario testing and repeated revisions make project deadlines harder to meet.

Slower Approvals

Unclear outputs and difficult comparisons slow stakeholder and agency reviews.

Uncertainty in Results

When outputs are difficult to verify or explain, defending engineering decisions becomes harder.

Your Modeling Software Should Make Work Easier.

The VO Solution

Everything you need to model with confidence

Easy to Learn

VO simplifies the learning process so engineers can become confident users faster.

Build Models Faster

Buy back hours on setup with intuitive modeling tools, drag-and-drop editing, and built-in GIS integration.

One License. Complete Modeling.

Access both hydrologic and hydraulic modeling with the OTTHYMO and SWMM engines in one interface.

Meet Every Deadline

Keep projects moving with faster scenario testing and fewer modeling bottlenecks.

Accelerate Project Approvals

Create clear visual schematics and scenario comparisons that help reviewers easily understand and approve your recommendations.

Model with Confidence

Generate accurate, defensible results backed by expert technical support, trusted modelling engines, and integrated design storms.

Engineering can be challenging. Your modelling software shouldn’t be.

We understand the pressure to evaluate multiple design scenarios, satisfy regulatory requirements, and deliver reliable results with confidence.

You shouldn’t have to wrestle with complex software or become an expert just to build a model.

That’s why VO was designed to make modeling simple.

Developed alongside industry experts and refined through decades of real-world use, VO is easy to learn, fast to use, and designed to help you spend less time managing software and more time engineering.

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Built by Engineers

Built by Engineers

Designed by engineers, for engineers.

Simple by Design

Simple by Design

Removes unnecessary complexity.

L.E.A.F

L.E.A.F

Learn Easily. Apply Fast.

Trusted by Regulators

Trusted by Regulators

Proven by decades of real-world results.

What Engineers Say About VO

I have been using VO for a while now. Modelling with VO is quite helpful and made the job easy. Required tools are within reach and the user interface is very well designed. I like the way it is programmed to run multiple network scenarios and also run multiple simulations with different rainfall data.
Dheeraj ThamatamCivil Projects Manager
Most of my work includes modelling development sites and stormwater management. The model is very easy to model with and to extract the results.
Glenn SwitzerDevelopment Engineer
VO is great. The addition of SWM LID made it a top-notch software for SWM and LID modelling. It is very user-friendly, and it is fast when computing.
Dr. Imtiaz ShahUniversity Professor
VO has allowed me to clearly and accurately model stormwater ponds in Ontario. It is easy to learn with the assistance of the user manual, reference guides, and tutorials. The interface is highly intuitive and easy to get used to. The staff at Smart City Water are quick to respond to requests. As a student in Environmental Engineering, VO has been essential to my research.
Bryn Reynolds
Bryn ReynoldsGraduate Student
VO has an easy-to-use interface for constructing a SWM model, including flexibility in the selection of hydrograph types. The ‘drag and drop’ and element connectivity features allows for large and relatively complex models to be constructed easily including flow routing, minor/major flow splits, and LIDs.
Andy KroessSenior Water Resources Engineer
I’ve been using VO Model for the past eight years, and it has significantly enhanced the efficiency and accuracy of our project outcomes. The software’s intuitive interface allows for easy integration of complex datasets, and its robust modeling capabilities have streamlined our hydrological analyses, saving me valuable time and resources.
Neelam GuptaManager of Hydrology and Hydraulics
VO's intuitive interface and detailed output options made it easy to configure my hydrologic model. The technical support provided by the SCW team, helped me to navigate initial learning curves and in successfully implementing my specific research needs.
Jane GaoGraduate Student
Our users are Water Resources Engineers, and the software is used to review digital VO models submitted in support of development applications. As HYMO users who started off with other software, the interface of VO is a lot more user-friendly.
Irina MarouchkoSenior Water Resource Engineer
We have used the VO software for stormwater management design, subdivision planning and site plan design. While we have also used other HYMO-based software programs, we have found using Visual OTTHYMO (VO) is EASY.
Zhenyong (Zen) Li Consulting Engineer
I have been pleasantly surprised at how easy VO has been to learn!
Adam FritzProject Engineer
What stands out most about VO is how simple it is to use. With only a few key parameters required, you can build models quickly without getting bogged down in unnecessary inputs. The schematic interface is intuitive, and simulations run fast - even for large catchments. It’s a practical, reliable tool we trust for our planning and design projects.
Raymond HeCivil Engineer and Hydrologic Modeller
TRCA has utilized VO for over a decade in a wide range of watershed studies and regulatory applications. The platform has played a critical role in advancing TRCA’s understanding of hydrologic processes and supporting sound technical decisions in floodplain management, stormwater assessment, and environmental planning. VO’s ease of use, reliability, and strong alignment with provincial and municipal technical standards have made it a dependable tool within TRCA’s modelling framework.
Toronto and Region Conservation Authority
The LSRCA very much appreciates the support of Smart City Water related to the VO software package. Through the administration of our flood mapping programs and development review to protect people and property from flooding, we see many different hydrologic scenarios across a large and geographically diverse area. Smart City Water staff have always been responsive in assisting LSRCA with using VO effectively to deliver on our mandate.
Ken CheneyDirector, Flood Management
Get Started

Get Started with VO in Three Simple Steps

Request a License

1. Request a License

Tell us about your team and project needs. We’ll help you choose the right licensing option and provide a personalized quote.

Install and Get Started

2. Install and Get Started

Download VO, activate your license, and use our onboarding resources to get up and running quickly.

Build Better Models

3. Build Better Models

We’ve made getting started simple, so you can focus on delivering successful projects.

Buy a VO License

Why VO?

At Smart City Water, we know you want to be a confident engineer who delivers stormwater models that clients and reviewers can trust. To do that, you need software that’s easy to learn, simple to use, and helps you build reliable models without wasting valuable time.

The problem is that many hydrologic modeling tools are difficult to learn, slow to use, and require unnecessary workarounds. That means more time spent building models, making revisions, and managing software instead of solving engineering problems.

We believe stormwater modeling software should make your job easier — not more complicated.

That’s why we built VO

VO helps engineering consultants, cities, municipalities, universities, and regulatory agencies build models faster, evaluate design options with confidence, and produce results that support regulatory reviews and project approvals.

Getting started is simple

1

Request Your License

Tell us about your team, and we’ll help you choose the licensing option that’s right for you.

2

Install VO

Download the software, activate your license, and start building models with an intuitive interface that’s easy to learn.

3

Start Modeling

Build reliable hydrologic models faster, spend less time on repetitive tasks, and deliver projects with greater confidence.

Request your license today and see why engineering teams across North America choose VO for their stormwater projects.

Buy a VO License

Flexible Licensing for Every Team

Whether you are an independent consultant, a municipality, or a large engineering organization, VO offers licensing options designed to match the way your team works.

Individual

Best for
Independent consultants
  • VO OTTHYMO
  • One named user on a single device
  • Technical support
  • Software updates
Request Pricing
Most Popular

Flexible

Best for
Engineering consultants
Municipalities
Conservation authorities
  • VO OTTHYMO
  • VO SWMM
  • Unlimited installations within one organization
  • One concurrent user
  • Technical support
  • Software updates
  • Free 1-hour virtual onboarding and training session
Request Pricing

Enterprise

Best for
Larger organizations
Multi-office teams
University Departments
Government Agencies
  • Everything in Flexible
  • Multiple concurrent users
  • Centralized license management
  • Free 3-hour virtual onboarding and training session
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