Podcast Episode #4: Sustainable Drainage Systems (SuDS)

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In this episode of the Brookbanks Podcast hosted by Ben Wakeling, guests Paul Coombs, Senior Civils Engineer and Andrew Wilkinson, Director, share their experience and reflections on the evolving landscape of Sustainable Drainage Systems (SuDS).

Understanding SuDS: What, Why & Where

SuDS are designed to replicate natural drainage processes, offering a more sustainable alternative to traditional underground systems. Andrew encourages listeners to explore the evolving regulations such as the National Standards for SuDS (updated July 2025), and compares England’s position to the journey already travelled in Wales, with concepts such as SuDS Approval Bodies (SABS) being in place.

Guidance highlights how SuDS can deliver multiple benefits, improving water quality, enhancing amenity, and supporting biodiversity, while managing flood risk. Essentially, Engineers/Designers want to mimic nature in providing flood protection through use of SuDS, rather than defaulting to concrete or underground “traditional” drainage in order to provide multiple benefits to water quality and amenity and not just dealing with water volumes.

Commuted Sum Costing: A Persistent Challenge

One of the key barriers to SuDS adoption is the commuted sum, the financial value assigned to assets handed over for long-term maintenance. Paul notes that while designers have tools to cost schemes, inconsistent rates and under-utilisation of software often leave this task to commercial teams. He proposes the development of an online calculator to provide consistent, realistic values for SuDS assets, potentially linked to carbon costing tools to support sustainable decision-making.

Adoption & Maintenance: Bridging the Gap

SuDS offer clear benefits to communities and ecosystems, having well maintained watercourses that convey water through catchments allows for wildlife to flourish and improved water quality. But their maintenance requirements can be a sticking point. Traditional drainage systems are easily serviced with standard equipment, whereas SuDS features like swales require different approaches. This can create friction during design reviews, particularly with local authority highways teams accustomed to conventional methods. Education and greater adoption will make these challenges easier to face, as new tools and methods are used.

Looking Ahead: Industry Change & Innovation

While this podcast isn’t a comprehensive training session, it offers valuable insights into the practical realities of SuDS design and adoption. Paul and Andrew’s reflections underscore the need for innovation, collaboration, and consistency in how SuDS are implemented and maintained.

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Listen Now!

Whether you’re a drainage engineer, developer, or simply interested in sustainable infrastructure, this episode offers practical insights and forward-thinking ideas from two of Brookbanks’ leading experts.

Members on the Podcast

Director

Andrew Wilkinson

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Head of Cost and Commercial

Ben Wakeling

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Senior Civil Engineer

Paul Coombs

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