Next Generation Drainage Design

A complete end-to-end drainage design solution enabling engineers to design optimal and UK compliant drainage schemes efficiently and cost-effectively.

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Sustainable drainage system (SuDS)

Transform Your Drainage Design Productivity

A powerful end-to-end drainage design solution that enables streamlined and adaptable designs.

Flow is a hydraulic modelling package for the design and analysis of optimal, compliant and cost-effective storm and foul water drainage networks, developed for organisations looking for a robust, intuitive and complete solution.

Whether standalone (PDS) or embedded within AutoDesk environment (SmartDrainage), the powerful CAD interface provides a single, all-encompassing solution.

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Streamline Design, Reduce Costs and Keep Engineering Teams Connected

Streamline design to save time

Intelligent design automation and integrated tools help engineers to spend more time on value engineering.

Stay connected with cloud licensing

Engineers can stay connected to their design solutions at all times with cloud licensing. Access software remotely and take licences offline.

Stop waiting for licenses to become available

Only pay for what you use. Design tools are available in subscription bundles which means consultancies can scale without upfront costs.


Expand Your Design Capabilities

Storm & Foul Drainage Design Icon
Storm & Foul Design

Conveyance and hydraulic analysis allows engineers to ensure designs are compliant.

Sustainable drainage system design (SuDS) Icon
SuDS Design

Ensure outputs are compliant with UK specific drainage design requirements.

Standard Integration

Compatible with Autodesk, AutoCAD® and Civil 3D® or can be used standalone.

Fully BIM Compliant

Deliver the BIM outputs clients require and participate in all projects.

Compliant Design

Ensure outputs are compliant with UK specific drainage design requirements.

Live Design

Real-time design in 3D, longsection and plan allows for intuitive navigation and auditing of results.

Causeway Flow Drainage Design Software

Smart Drainage Design Starts with Causeway Flow

Empower engineers, consultants, developers and approving authorities to deliver an optimal and compliant design.

Causeway Flow drainage design and modelling software is built on the Modified Rational method for sizing conveyance systems and the state-of-the-art 1D SWMM engine for hydraulically analysing storm, SuDS or a combination of traditional and sustainable drainage systems.

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SmartTools CAD Interface with BIM outputs

Drainage Design Integrated With CAD

Utilise standalone or embed within an AutoDesk environment.

Causeway Drainage Design provides a powerful integration between Flow and either PDS or SmartDrainage. Changes made are dynamically updated in either module ensuring design integrity is maintained at all times. Powerful ‘round tripping’ ensures engineers spend time value engineering rather than fixing design discrepancies.

Annotation outputs, longsections, schedules and 3D BIM models can be generated automatically from the design, ensuring consistency at the click of a button.

Work Remotely with Cloud Licensing

Work Together, Win Together

Global multi-user access to all modules at any given time.

Causeway Drainage Design allows businesses to optimise licenses, offering multi-user access that enables engineers to work in different modules at the same time.

The solution can be accessed by teams both locally and globally utilising the Causeway License manager.

Flow Drainage Design Bundles

Flow Drainage Design software provides powerful tools to handle any drainage design.


For those needing straightforward hydraulic design capability

  • Flow


For those needing hydraulic design plus CAD integration. Includes all essential bundles items and the following

  • Flow+
  • Drainage Layout and Annotation (SmartDrainage and PDS Drainage)
  • Flow and Full Drainage Integration
  • Sketch


For those needing to deliver BIM outputs. Includes all essential and professional bundle items and the following

  • BIM Design

Not sure which Bundle is right for you?

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Trusted By The Industry

See how Causeway Flow has helped engineers, architects and local authorities transform their productivity.

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