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  • Sustainability Programme Delivery Support
  • Sustainability Skills and Training

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  • Energy Generation Feasibility Design
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Flood Risk (FRA’s)
Home | Services | Civil Engineering | Flood Risk (FRA’s)

Flood Risk (FRA’s)

Planning-Ready Flood Risk Services for Development & Infrastructure

View All Civil Engineering Services

Flood Risk Planning Support Across the UK

Flood risk requirements and terminology vary across the UK. Arthian prepares assessments in line with all relevant policies, including NPPF in England, TAN15 in Wales, SPP in Scotland, and PPS15 in Northern Ireland.
 

We deliver 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 provide 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

When Is a Flood Risk Assessment Required?

The specific triggers for flood risk assessments differ between England, Wales, Scotland and Northern Ireland. We help determine whether an assessment is needed and the appropriate approach for each site.

 
Typical triggers include:

     

  • Mapped flood risk areas (e.g. Flood Zones, Development Advice Maps)
  • Sites over 1 hectare
  • Vulnerability changes (e.g. commercial to residential)
  • Critical Drainage Areas or surface water sensitivity

Our Services:

We offer a comprehensive Flood Risk Assessment (FRA) service, including:

Core Services
SuDS Design & Drainage Strategy
Modelling & Climate Resilience
Drainage Impact & Flood Risk Permitting

Core Services

Flood risk permitting and consents include Environment Agency Flood Risk Activity Permits, SEPA Controlled Activities Regulations licences, Land Drainage Consents, and ordinary watercourse consents as required by regulators.

  • Flood Risk Assessments (FRA)
  • Sequential & Exception Testing
  • Flood Modelling & Mapping (TUFLOW, InfoWorks ICM)
  • Flood Mitigation & Resilience Design
  • Surface Water Management & SuDS Integration
  • Drainage Impact Assessments and Strategies
  • Flood Risk Permitting & Consents
  • Portfolio Screening for Multi-Site Developments
Drainage Impact & Flood Risk Permitting

SuDS Design & Drainage Strategy

We design SuDS strategies in line with the DEFRA Non-Statutory Technical Standards for Sustainable Drainage Systems (2025), CIRIA SuDS Manual C753, and relevant local authority and regulator guidance.
Our drainage strategies and Drainage Impact Assessments are prepared in line with the relevant requirements for each country, including SEPA guidance in Scotland.

Drainage Impact & Flood Risk Permitting

Modelling & Climate Resilience

Our modelling uses approved data from the Environment Agency, SEPA, Natural Resources Wales, and the Rivers Agency to ensure compliance with national standards.

We apply the latest climate change allowances for each UK nation to ensure designs meet local requirements and long-term resilience goals.

 

Drainage Impact & Flood Risk Permitting

Core Services

Flood risk permitting and consents include Environment Agency Flood Risk Activity Permits, SEPA Controlled Activities Regulations licences, Land Drainage Consents, and ordinary watercourse consents as required by regulators.

  • Flood Risk Assessments (FRA)
  • Sequential & Exception Testing
  • Flood Modelling & Mapping (TUFLOW, InfoWorks ICM)
  • Flood Mitigation & Resilience Design
  • Surface Water Management & SuDS Integration
  • Drainage Impact Assessments and Strategies
  • Flood Risk Permitting & Consents
  • Portfolio Screening for Multi-Site Developments
Drainage Impact & Flood Risk Permitting

SuDS Design & Drainage Strategy

We design SuDS strategies in line with the DEFRA Non-Statutory Technical Standards for Sustainable Drainage Systems (2025), CIRIA SuDS Manual C753, and relevant local authority and regulator guidance.
Our drainage strategies and Drainage Impact Assessments are prepared in line with the relevant requirements for each country, including SEPA guidance in Scotland.

Drainage Impact & Flood Risk Permitting

Modelling & Climate Resilience

Our modelling uses approved data from the Environment Agency, SEPA, Natural Resources Wales, and the Rivers Agency to ensure compliance with national standards.

We apply the latest climate change allowances for each UK nation to ensure designs meet local requirements and long-term resilience goals.

 

Frequently Asked Questions

Do I need a Flood Risk Assessment for planning?

Yes—if your site meets national or local triggers for flood risk assessments, such as being in a mapped flood risk area or a Critical Drainage Area. Requirements differ across England, Wales, Scotland and Northern Ireland.

Can you help with drainage and SuDS?

Absolutely. We design compliant surface water strategies and SuDS layouts aligned with national standards.

Do you support infrastructure and multi-site projects?

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

What about flood risk permits and consents?

We prepare and submit all relevant applications, including EA permits, SEPA CAR licences, and watercourse consents.

Get in Touch

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