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Home| Services| Flood Risk

Flood Risk

Strategic Flood Risk Support for Planning, Design and Compliance

Flood Risk

Planning-Ready Flood Risk Services for Development & Infrastructure

Arthian provides Flood Risk Assessments (FRAs) and mitigation strategies to support planning applications, manage water-related risks, and unlock development potential. Whether you’re designing housing, infrastructure or commercial schemes, we deliver regulator-aligned reports tailored to your site and sector. We support:

 

  • Residential and mixed-use developments
  • Infrastructure corridors (roads, rail, utilities)
  • Commercial, education and healthcare sites
  • Strategic land and regeneration projects

Our team of specialist flood risk consultants boast UK-wide coverage, and with former regulators and infrastructure experts on staff, we’re perfectly placed to help your team achieve its goals. With integrated support from drainage, SuDS, ecology and permitting teams, our GIS-based mapping and modelling capability ensures that your project is in good hands.

Our Core Flood Risk Services

Our team of hydrologists, drainage engineers and environmental consultants deliver regulator-aligned assessments that support planning applications, design development and long-term resilience. We tailor our approach to your site, sector and flood zone context, ensuring assessments are proportionate, defensible and aligned with national and local guidance.
Whether you’re preparing a Flood Risk Assessment (FRA), designing SuDS, or responding to LLFA or EA feedback, we help you manage flood risk with clarity and confidence.

Flood Risk Assessments (FRA)
Sequential & Exception Testing
Flood Modelling & Mapping (HEC-RAS, TUFLOW, InfoWorks)
Portfolio Screening for Multi-Site Developments

Flood Risk Assessments (FRA)

Flood Risk Assessments (FRAs) are essential for understanding and managing flood risk in support of planning applications, particularly for sites located within designated flood zones. We deliver planning-ready assessments that evaluate potential sources of flooding—such as rivers, surface water, groundwater, and coastal systems—and assess the impact on proposed developments. Our reports include site-specific modelling, mitigation recommendations, and alignment with national and local planning policy, helping to demonstrate that flood risk has been appropriately considered and managed. This supports informed decision-making and smooth progression through the planning process.

Sequential & Exception Testing

Sequential & Exception Testing is a critical part of the planning process for developments in flood-prone areas. These evidence-based assessments help demonstrate that a site is suitable for development by applying the Sequential Test to show that there are no reasonably available alternative sites at lower flood risk. Where necessary, the Exception Test is used to justify development by proving wider sustainability benefits and ensuring that the site can be made safe for its lifetime. Our team prepares robust, policy-aligned documentation to support planning applications and guide decision-makers with confidence.

Flood Modelling & Mapping (HEC-RAS, TUFLOW, InfoWorks)

Flood Modelling & Mapping provides detailed, site-specific analysis to understand flood dynamics and support informed decision-making for development and permitting. Using industry-standard tools such as HEC-RAS, TUFLOW, and InfoWorks, we simulate flood scenarios to assess flow paths, depths, velocities, and potential impacts on infrastructure and land use. Our modelling supports planning applications, Flood Risk Activity Permits, and strategic flood risk management. We also liaise directly with regulators across the UK, including the Environment Agency, to ensure that outputs meet technical requirements and facilitate smooth regulatory approval.

Portfolio Screening for Multi-Site Developments

Portfolio Screening for Multi-Site Developments enables rapid, high-level assessment of multiple locations to identify flood risk constraints and prioritise sites for further investigation. This approach is ideal for developers, asset managers, and planners working across large land portfolios or national infrastructure programmes. Our team uses mapping tools, flood zone data, and planning policy insights to deliver clear, comparative outputs that highlight risk levels and inform strategic decision-making. By identifying potential issues early, we help clients focus resources where they’re needed most and streamline the path to development.

Flood Risk Assessments (FRA)

Flood Risk Assessments (FRAs) are essential for understanding and managing flood risk in support of planning applications, particularly for sites located within designated flood zones. We deliver planning-ready assessments that evaluate potential sources of flooding—such as rivers, surface water, groundwater, and coastal systems—and assess the impact on proposed developments. Our reports include site-specific modelling, mitigation recommendations, and alignment with national and local planning policy, helping to demonstrate that flood risk has been appropriately considered and managed. This supports informed decision-making and smooth progression through the planning process.

Sequential & Exception Testing

Sequential & Exception Testing is a critical part of the planning process for developments in flood-prone areas. These evidence-based assessments help demonstrate that a site is suitable for development by applying the Sequential Test to show that there are no reasonably available alternative sites at lower flood risk. Where necessary, the Exception Test is used to justify development by proving wider sustainability benefits and ensuring that the site can be made safe for its lifetime. Our team prepares robust, policy-aligned documentation to support planning applications and guide decision-makers with confidence.

Flood Modelling & Mapping (HEC-RAS, TUFLOW, InfoWorks)

Flood Modelling & Mapping provides detailed, site-specific analysis to understand flood dynamics and support informed decision-making for development and permitting. Using industry-standard tools such as HEC-RAS, TUFLOW, and InfoWorks, we simulate flood scenarios to assess flow paths, depths, velocities, and potential impacts on infrastructure and land use. Our modelling supports planning applications, Flood Risk Activity Permits, and strategic flood risk management. We also liaise directly with regulators across the UK, including the Environment Agency, to ensure that outputs meet technical requirements and facilitate smooth regulatory approval.

Portfolio Screening for Multi-Site Developments

Portfolio Screening for Multi-Site Developments enables rapid, high-level assessment of multiple locations to identify flood risk constraints and prioritise sites for further investigation. This approach is ideal for developers, asset managers, and planners working across large land portfolios or national infrastructure programmes. Our team uses mapping tools, flood zone data, and planning policy insights to deliver clear, comparative outputs that highlight risk levels and inform strategic decision-making. By identifying potential issues early, we help clients focus resources where they’re needed most and streamline the path to development.

Focused Flood Risk Services

Below are our specialised Flood Risk services. For more detailed support, visit our focused service pages.

Why Choose Arthian for Flood Risk?

Why Choose Arthian for Flood Risk?

Engineering services delivered by specialists:

Our Understanding

Deep understanding of planning, infrastructure, and environmental interfaces.

Our Experience

National experience with regional insight and regulatory familiarity.

Integration

Fully integrated with geotechnical, hydrological, and ecological disciplines.

Results Driven

Commitment to technical rigour, clear communication, and long-term outcomes.

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London Borough of Islington Heat Decarbonisation Plans
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London Borough of Islington Heat Decarbonisation Plans

Development of 31 comprehensive Site Heat Decarbonisation Plans via Low Carbon Skills Fund (LCSF) Phase 5 funding

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Onshore Civil Engineering Design for Transmission & Distribution

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Get in Touch

We’d love to hear from you – whether you have a question, a project in mind, want to explore job opportunities, or just want to say hello.

Contact Us

Frequently Asked Questions

Do I need an FRA for planning?

Yes—if your site is in Flood Zone 2 or 3, or meets other planning triggers, an FRA is required.

Can you help with drainage and SuDS?

Absolutely. We design compliant surface water strategies and SuDS layouts.

Do you support infrastructure and multi-site projects?

Yes—we offer corridor-wide FRA coordination and portfolio screening.

What about flood risk permits?

We prepare and submit Flood Risk Activity Permits and Watercourse Consents.

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