OpenTerra Plan —
Smart rainwater management
directly within the planning model.

Reliably model, hydraulically link, calculate, and simulate blue-green infrastructure—all within a unified digital system for buildings, open spaces, and infrastructure. Even during the planning phase, the system provides a solid basis for decision-making, allows for comparisons of different options, and generates all relevant documentation.

OpenTerra Plan — Smart Rainwater Management Directly Within the Planning Model

* Free beta access · Developed in collaboration with Fraunhofer Italia · Currently undergoing validation

OpenTerra Plan helps engineers , architects, building owners, and project managers visualize stormwater scenarios and make technical decisions more quickly and confidently .

Model intuitively. Make better decisions.

Upload a 2D CAD or 3D IFC model, place and link blue-green infrastructure and stormwater management components. From drainage, retention, and infiltration to flooding, water balance, water treatment, and water demand—everything iscalculated, simulated, and evaluateddirectly within the model.

Critical situations becomeimmediately apparent—clearly displayed and easily customizable.

Think globally. Act locally.

Enter the project address– relevant weather data is automatically provided, or you can add your own data. Statistical rainfall, block rainfall, or long-term data for any location worldwide, presented clearly and ready for immediate use.

Location-specific weather data is directly incorporated into the planning model, providinga reliable basisfor project-related calculations, alternatives, and decisions.

Present with precision. Communicate clearly.

Fromcompetition to design to construction planning—results are presented clearly and in high quality directly in 2D or 3D models. Interrelationships remain visible, variants can be compared, and the implications of decisions are clearly identifiable.

This allows technical details, coordination, and decisions to be communicatedto clients, government agencies, or specialist plannersin a precise and transparent manner.

Would you like to see how this works in practice?

The key features of OpenTerra Plan

Six key functional areas —frommodelingtointelligent assistance. Each one solves a specific problem in your day-to-day planning work.

3D surface and component modeling

Surfaces and layers with different properties affecting runoff behavior, as well as stormwater management elements, can be easily captured and defined in the 3D model. Everything is clearly linked, organized, and easy to edit.

No Excel spreadsheets. No detailed drawings—quick and easy to understand

Capture surfaces and components in the 3D model

Hydraulic editor with linked waterways

Set discharge rates or flow restrictors, create components for storage, infiltration, or treatment, and define floodplains.
Everything is logically linked and finely adjustable

No need to switch between tools—everything in one model

Understanding Hydraulic Connections Visually

Simulation using block precipitation and long-term data

Compare different scenarios involving heavy or prolonged rainfall. Analyze and adapt solution options involving retention, runoff, infiltration, and overflow.

Risk adaptation directly within the model

Generate long-term rainfall data

Standard-based sizing and detailed calculations

Design rainwater systems for infiltration, retention, or reuse in accordance with recognized methods and regulations. To facilitate a discussion on equal terms with the client, authorities, or manufacturers.

Sizing, testing, and verification all in one tool

Select appropriate methodologies

Analysis, Documentation, and Reporting

All relevant results are presented to you in a clear and organized manner through tables, charts, time series, or graphs. You can customize your information into reports or drainage plans to suit your specific needs.

Share information directly and clearly

Understand the results immediately

Smart Assistance with Olaia

Olaia is the assistant integrated into OpenTerra Plan that supports the software-related planning process. It helps users access project information and application-specific content, navigate functions and model logic, and understand the context of inputs and outputs —all directly within the application.

Context-sensitive support for working in OpenTerra Plan

Your co-pilot is always by your side

Why Professional Planners Choose OpenTerra Plan

Blue-Green Integrated

Examine how evaporation from different types of vegetation or infiltration affects your planning

Collaborate effectively

Manage team roles or invite other specialist planners to the model. With easy-to-follow processes and visualizations

Start flexibly

Flexibly start, pause, and resume projects

Learn More

Take your rainwater expertise to the next level. And while you're at it

provide evidence

From flood analysis to water balance. With diagrams, text modules, references to standards, schematics, and complete documentation

Making risks visible

Flooding, waterlogging, and much more can be clearly identified and communicated

Plan faster

Right in the 3D model, with all components, waterways, and results at a glance

Explore scenarios

Compare project scenarios directly with different rainfall data, components, or measures

Transparent data

Compliant with standards and technically sound in accordance with all relevant regulations, such as DWA and DIN/EN

Contributors

The right tool for every target group

engineers

Use OpenTerra Plan to quickly and reliably integrate stormwater modeling and sizing into environmental, urban water management, or building services engineering projects

Architects

Integrate, test, and define interfaces for decentralized rainwater management on buildings and properties in simple steps

Landscape Architects & Open Space Planners

Independently model, compare, and implement nature-inspired sponge city concepts

Manufacturers & System Providers

Technical integration of our own technical product and system solutions, as well as their parameters. This also includes consulting and training for our target audience

Colleges & Universities & Government Agencies

Use OpenTerra Plan for teaching and research, as well as for exams and application-oriented coursework in civil engineering

OpenTerra Plan — for your field of study

Real-world projects

Planned and verified with OpenTerra Plan. Sustainablestormwater management, climate-resilient planning, validatedflood risk assessments.

TOMORROW Office Building, Munich

Building project focused on rainwater management

Using Openterra, the retention roofs with flow restrictors, as well as the drainage system via outlets and emergency outlets, were designed based on the simulation. The software also focused on rainwater harvesting for irrigation, providing key parameters for demand and efficiency that were essential for the planning process.
Hautum Infrastructure

PIR Winery, Sicily

Innovation District with Complex Water Systems

100% retention of heavy rainfall and targeted release to vegetation for an optimal water balance. OpenTerra provided the calculation basis.
dalpiaz

Salzach Center Burghausen

Sustainable rainwater management from the roof to infiltration

Openterra provided the key data for hydraulic components such as drains, flow restrictors, cisterns, infiltration systems, and swales, as well as the water balance and flood risk assessment for this technically challenging building project.
Volksbank Raiffeisenbank

Predictable project costs. Full control.

Get to know

Free initial consultation

In a30-minute conversation, we’ll work together to determine whether OpenTerra Plan is a good fit for your use case, planning phase, and workflow.

Clarify the project typeand requirements
Check if it's rightfor your project
Defineanappropriateintroduction

1 credit = 1 €

Transparent Credit Model

Starting at 90 €

per project

Simple, transparent, and flexible. No hidden costs, no minimum contract term.

Project Activation:90 credits (one-time fee)
Active project:15 credits per month
Pause:free
Reactivation:30 credits

Discounts: 10–30%

Get started right away

Start your own project

Instead of a standalone demo, you’ll jumprightinwith a real project. The time you invest goes directly toward your project.

Tangibleprofessional benefits from day one
More efficientthan a traditional trial version
Personalsupportduring onboarding

Scientifically developed.
Built for real-world use.

OpenTerra Plan is the result of years of development in close collaboration between OpenTerra and Fraunhofer Italia.
Under the scientificand technicaldirection ofDr. Dietmar Siegele,the methodological and logical foundations upon which the software is based were developed.

Scientific Director

Dr. Dietmar Siegele, Eng.· Environmental Engineer · Project Manager, Fraunhofer Italia
Together with his team, he played a key role in shaping the model logic, simulation methodology, and technical validation of OpenTerra Plan.

What makes OpenTerra Plan special

OpenTerra combines this scientific foundation with practical knowledge, specific planning requirements, and real-world use cases.
The result is software that is scientifically sound and, at the same time, directly applicable to planning.

Ready to plan your rainwater system the right way?

Start with afree initial consultationor try OpenTerra Plan directly on your own project.