Urban stormwater analysis in OpenFlows Storm showing a flood simulation and network capacity.

OpenFlows Storm

Starting at

$1,355.00 USD

Stormwater system modeling and analysis software

Purchase OpenFlows Storm

BENEFITS

Design resilient stormwater systems

Use comprehensive modeling and analysis to design storm networks that control runoff, reduce flooding, and meet regulatory compliance, while accelerating productivity through AI-assisted workflows.
Stormwater runoff and drainage network layout in OpenFlows Storm, displaying terrain contours, manholes, and pipe connections around commercial building plans.

  • Reduce flood risk and improve infrastructure resilience

    Perform detailed hydrologic and hydraulic stormwater analysis to evaluate system performance, improve drainage networks, and reduce flood risk.

  • Deliver cost-effective stormwater designs

    Optimize and compare design alternatives to efficiently size pipes and detention systems, minimizing capital costs while ensuring regulatory compliance.

  • Accelerate urban drainage planning and approvals

    Streamline modeling and scenario analysis through CADbased workflows and GIS data import/export to fast-track regulatory reviews and confidently meet compliance.

PRICING OPTIONS

Exclusive pricing options

Find the right professional tier for you

OpenFlows Storm Essentials

Stormwater system modeling for small site projects with core hydrologic and hydraulic modeling capabilities for storm sewer and detention design.

Starting at

$1,355.00 USD

12-month Virtuoso subscription

Includes 1 license and 1 Key for training or services

  • Supports up to 10 inlets, 10 links, and 1 pond
  • Includes: OpenFlows StormCAD, OpenFlows PondPack
  • Steady-state GVF and Rational solvers for peak flow analysis
  • Core rainfall-runoff modeling methods
  • Detention pond design and routing capabilities
  • Pre- and post-development flow comparison

OpenFlows Storm Standard

Stormwater system modeling for urban drainage systems with full 1D solvers and 1D/2D flood analysis for larger networks.

Starting at

$3,354.00 USD

12-month Virtuoso subscription

Includes 1 license and 1 Key for training or services

  • Includes: OpenFlows StormCAD, OpenFlows CivilStorm, OpenFlows PondPack
  • Supports up to 50 inlets, 50 links, and 3 ponds
  • Full 1D Saint-Venant dynamic solvers (implicit & EPA-SWMM)
  • 1D/2D hydraulic analysis for surface flood modeling
  • Long-term simulations with statistical reporting
  • Expanded runoff and loss calculation methods

OpenFlows Storm Advanced

Urban drainage and stormwater system modeling for complex municipal and large-scale networks.

Starting at

$5,368.00 USD

12-month Virtuoso subscription

Includes 1 license and 2 Keys for training or services

  • Includes: OpenFlows StormCAD, OpenFlows CivilStorm, OpenFlows PondPack
  • Supports unlimited inlets, up to 250 links, and unlimited ponds
  • Implicit and explicit 1D Saint-Venant dynamic solvers
  • Includes 1D/2D hydraulic analysis for surface flood modeling
  • Supports long-term simulations with statistical reporting
  • Scaled for large, interconnected drainage networks

OpenFlows Storm Ultimate

Urban drainage and stormwater system modeling for complex municipal and large-scale networks.

Starting at

$10,069.00 USD

12-month Virtuoso subscription

Includes 1 license and 2 Keys for training or services

  • Includes: OpenFlows StormCAD, OpenFlows CivilStorm, OpenFlows PondPack
  • Supports unlimited inlets, links and ponds
  • Implicit and explicit 1D Saint-Venant dynamic solvers
  • Includes 1D/2D hydraulic analysis for surface flood modeling
  • Supports long-term simulations with statistical reporting
  • Scaled for large, interconnected drainage networks

More details

Advanced hydrologic and hydraulic storm system analysis 

  • Model 1D/2D hydraulics to visualize pipe and surface flooding directly in CAD and through GIS data outputs 
  • Use implicit and explicit (EPA-SWMM) dynamic solvers for precise, unsteady flow analysis 
  • Simulate rainfall-runoff using standard methods (SCS, Rational) & imported precipitation data. 
  • Analyze complex pond outlets and structures with varied tailwater conditions to model storage 
  • Detect bottlenecks with capacity analysis and calculate inlet/gutter flow from CAD geometry  
  • Apply industry-standard hydraulic calculation methods for validated and defensible results 
  • Perform inlet capacity and gutter flow analysis

Automated storm system design and optimization  

  • Design cost-effective storm sewer sizes and invert elevations with automated feedback 
  • Use constraint-based design to auto-size cost-effective pipes using hydraulic model feedback 
  • Model detention ponds and outlet structures to control post-development peak flows 
  • Compare pre- and post-development drainage behavior for design evaluations 
  • Build or refine drainage models using data from GIS files, CAD platforms, and digital terrain models 
  • Runs within Bentley OpenRoads, OpenSite, OpenRail, and MicroStation or standalone 
  • Optimize conveyance and storage for minimal capital cost impact 
  • Query model data and streamline everyday workflows using Bentley Copilot, an AI-powered assistant (Technology Preview)   
  • Streamline data integration with automatic coordinate system support for GIS and terrain data 

Scenario Management and Decision Support 

  • Manage and visually compare unlimited "what-if" scenarios to evaluate alternatives and support decisions 
  • Estimate and compare the capital cost of different design alternatives to justify project budgets 
  • Generate the specific data and outputs needed to streamline and support regulatory reviews 
  • Create thematic maps and dynamic profiles to clearly visualize system performance 
  • Produce customized, presentation-ready reports for effective stakeholder communication. 
  • Support complex urban drainage planning and regulatory decision-making 
  • Share models for multi-disciplinary review in a collaborative digital twin environment 

For a full list of technical capabilities, view the OpenFlows Storm Data Sheet. 

Processor:  

  • As per minimum operating system requirements.

Operating System:

  • Windows 10 (64 bit)
  • Windows 11
  • Windows Server 2019 and 2022 

Memory:

  • As per minimum operating system requirements. 

Disk Space:

  • The software requires approximately 4.6 Gigabytes (GB) of disk space for  
    installation. Additional space is also required for user model and data files. 

Display:

  • As per minimum operating system requirements. 

USER STORIES

Real stories. Real results.

Cost-efficient stormwater network solution for housing complex in Florida

Quattrone used OpenFlows Storm to model and analyze stormwater network, saving USD 10,000 and avoiding a potential six-month construction delay.

The 25-acre construction site for the Mevers School of Excellence in Florida, showing the sandy soil and initial earthworks for the large underground stormwater system.

FAQS

Find answers

OpenFlows Storm is a hydraulic and hydrologic modeling software used to plan, analyze and design stormwater systems, including support for 1D/2D hydraulic analysis for surface flood modeling, automated pipe sizing, pond design, and scenario management. It is offered in tiered editions (Essentials, Standard, Advanced, Ultimate) that package capabilities from StormCAD, CivilStorm, and PondPack.

Stormwater modeling software simulates how runoff moves through inlets, gutters, pipes, channels, and detention facilities like ponds to help engineers size infrastructure, assess flooding, and meet regulations. It supports hydrologic runoff estimation, hydraulic analysis, pond design, scenario management, and reporting. OpenFlows Storm offers these capabilities, including pond and surface flood modeling.

OpenFlows Storm is a software portfolio that provides stormwater planning, analysis, and design by combining the capabilities of StormCAD (storm sewer design), CivilStorm (dynamic/advanced hydraulics, including 1D/2D), and PondPack (detention/pond design), with license‑specific limits per tier. StormCAD is a component application of OpenFlows Storm. It can also import/synchronize GIS data and export Esri Shapefiles to support GIS-driven workflows. 

Yes. OpenFlows Storm supports direct integration with MicroStation, OpenRoads, OpenSite and AutoCAD, letting you lay out and analyze models inside the CAD environment.

Yes. OpenFlows Storm supports hydrologic modeling (rainfall inputs, IDF data) and hydraulic analysis of stormwater networks, including 1D analysis of pipes/inlets/channels and 1D/2D hydraulic analysis for surface flood modeling (with the CivilStorm component available in the Standard or higher tiers)

Yes, at the site and urban drainage scale, OpenFlows Storm’s 1D/2D hydraulic capabilities for surface flood modeling help identify bottlenecks, simulate ponding/overland flow, and assess mitigation options to reduce flood risk and support compliance reviews.

You can publish and share your hydraulic models within a collaborative digital twin environment for seamless, multi-disciplinary reviews. Additionally, Bentley Copilot, an AI assistant (available as technology preview) boosts daily productivity by letting you query model data and launch commands using plain language. 

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