Site-specific NPPF Flood Risk Assessments and SUDS Drainage Designs 

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With over 15 years industry experience we can help you achieve planning application success. 

Our NPPF Flood Risk Assessments and Drainage Designs are site-specific and comply with requirements set by the Environment Agency, Lead Local Flood Authority and Planning Authorities. 

Do you need a Flood Risk Assessment?

You will need a Flood Risk Assessment if your development falls into any of the following three categories:

Flood Zone 1

  • Larger than 1 Hectare in size.
  • Change of use in the development type to a more vulnerable classification. 
  • Located within a Critical Drainage Area. 
  • Basement within an area susceptible to flooding from non-fluvial sources.

What can you expect from our Flood Risk Assessments?

Our site-specific FRAs can include the following:

Consultation with the Lead Local Flood Authority and Environment Agency (If applicable)

Fluvial Flood Risk- i.e. major watercourses, minor ordinary watercourses

Flood Zone 2

  • Located within an area considered as having between a 1 in 100 and 1 in 1,000 annual probability of river flooding;
  • Or land having between a 1 in 200 and 1 in 1,000 annual probability of sea flooding  (Land shown in light blue on the Flood Map). 

Flood Zone 3

  • Located within an area considered as having a 1 in 100 or greater annual probability of river flooding; 
  • Or Land having a 1 in 200 or greater annual probability of sea flooding (Land shown in dark blue on the Flood Map). 
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As part of our FRA we also include a Drainage Impact Assessment at no extra cost which includes the following:

Undertake preliminary calculation to determine a requirement for on-site attenuation

Undertake detailed evaluation of SUDS appropriate for inclusion within the drainage strategy

Key benefits of getting a site-specific Flood Risk Assessment

Reduce costs associated with planning delays and design changes

Professionals in both Flood Risk and Drainage Design/Engineering

FRDS provides a pro-active approach to flood risk and drainage, assisting the design team through every stage of the process

We have the ability to undertake complex technical analysis and drainage modelling, as required by the NPPF

Our reports are not computer generated generic reports, we provide site-specific FRA's tailored to clients individual requirements

Value Engineered Mitigation Measures and Drainage Designs

SUDS Drainage Design - Refused Planning Permission?

Have you had planning refused because you require a SUDS Surface Water Drainage Design similar to the ones below?

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"Prior to first occupation of the development hereby approved, a surface water system that demonstrates that the SuDS hierarchy has been followed shall be submitted to and approved in writing by this Local Authority."

'The submission of reserved matters shall be accompanied by a sustainable drainage scheme for foul and surface water drainage. No dwelling hereby permitted shall be occupied until a sustainable drainage scheme for foul and surface water drainage from the site has been completed in accordance with the approved details. The sustainable drainage scheme shall be retained, managed and maintained for the lifetime of the development in accordance with a management and maintenance plan submitted to and approved in writing by the local planning authority.'

You will require a SUDS Drainage Design if your development falls into any of the following categories:

10+ Dwellings 

Thanks again Chris! An excellent service with a fast turnaround, planning consent with no fuss, will definitely recommend.

Mike Hunter - 11 House Development, Leeds

Use the government website by clicking here to find out which Flood Zone your development is in. Dependent on the Flood Zone you may need to undertake a more detailed flood risk assessment. Click the button below for a free no obligation quote.

We have happy customers

Had no issues using FRDS, the FRA explained in depth what was required for our site to become developable within Flood Zone 3, with no issues raised from the council.

David Madden - Commercial Development, Keighley

Why choose Flood Risk & Drainage Solutions?

Unlike other companies that claim bogus 99% pass rates, unrealistic turnarounds and various levels of assessment, such as Levels 1, 2, 3 etc. We only quote on a site-specific basis, providing a simple breakdown of what is necessary to gain planning approval, with no hidden charges.

Fully Insured

15 Years Experience

NPPF Compliant

Single Point of Contact

Personalised Reports

Honest & Transparent

Our full service suite

Not only do we specialise in Flood Risk Assessments and SUDS Drainage Design we also offer the full service suite to support any size or type of project you may have.

  • Flood Risk Assessments
  • Non-adoptable Waste Water Treatment
  • Suds Drainage Designs
  • Property Level Protection
  • Sequential/exceptions Tests
  • Support to Local Planning Authorities
  • Flood Defense Consent
  • Environmental Permits
  • Insurance Reports
  • Drainage Strategies for Major Developments
  • Percolation Testing
  • Feasibility Assessments
  • Flood Storage Compensation
  • Detailed Drainage Design (unadopted)
  • Drainage Impact Assessments
  • Business Continuity
  • Sub-consultancy Services
  • Soakaway Design
  • Detailed Drainage Design (section 104)
  • Modelling

Contact us for a free no-obligation quote

The fastest way to get a quote is to send a site location plan, with a brief description of what you require to info@floodrisk-drainage.co.uk or use the contact form below.  We aim to get a quote back to you within 24 hours.

Gained a BSc in Sustainable Construction Methods from Lancaster University and has been working within the industry for 15+ years.

During his time as a Principle Flood Risk and Drainage Consultant he has achieved planning success on many projects, ranging from single residential property through to multimillion pound hotel and retail complexes nationwide. Chris has also supported Local Planning Authorities reviewing detailed drainage strategies in place of the LLFA for major planning applications.

Managing Director Chris Vose

Connect with Chris on Linkedin

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Flood Risk and Drainage Solutions,
144 New Lane,
Oswaldtwistle,
Accrington, 
BB5 3QW

© Flood Risk and Drainage Solutions 2019 

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07961 477330

Undertake a site visit – walkover and photographic survey (If applicable)

Research history of flooding both at and within the area surrounding the proposed development using flood data

Detailed assessment of Overtopping, Breach, Flood Storage Compensation etc (If applicable)

Recommendations for Mitigation Measures & Consents

Non-fluvial Sources of Flood Risk

Review site investigation reports and Percolation Test results

Estimate existing surface water run off/discharge rates

Building Regulations Hierarchy

Provide necessary drawings as required for outline/full planning applications

Hydraulic modelling proposed drainage system (if applicable)

Foul arrangement and point of connection

0.5 Hectare+ Residential Development 

1 Hectare+ Office/Light industrial

1 Hectare+ General Industrial

1 Hectare+ Retail

Site Area 1 Hectare+

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T: 07961 477330