Beyond the Basics: Advanced SuDS Features for Challenging Sites

When it comes to sustainable drainage systems (SuDS), many sites present unique challenges that demand more than standard solutions. While the basics such as permeable paving, soakaways, and swales are essential for managing runoff and improving water quality, complex sites often require a more advanced approach. Here, we explore some cutting-edge SuDS features that can help overcome the obstacles posed by difficult ground conditions, limited space, or strict regulatory requirements.

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Blue-Green Roofs

Blue-green roofs combine vegetation with water storage layers, providing both biodiversity benefits and extra attenuation of rainwater. These systems are ideal for urban developments where ground-level space is limited. By temporarily storing rainfall and releasing it slowly, blue-green roofs help reduce flood risk and support local wildlife.

Vortex Flow Controls

For sites where precise control of water discharge rates is critical, vortex flow controls offer a reliable solution. These engineered devices regulate outflow from attenuation tanks or ponds, ensuring compliance with planning conditions and reducing the risk of downstream flooding.

Geo-Cellular Storage Systems

Geo-cellular units are modular plastic structures installed underground to create large storage volumes for surface water. They are particularly useful in areas with limited surface space or where infiltration is not possible due to ground conditions. These systems can be designed for both attenuation and infiltration, depending on site requirements.

Rainwater Harvesting for Non-Potable Use

Integrating rainwater harvesting into SuDS not only reduces demand on mains water but also supports the discharge hierarchy outlined in the National SuDS Standards. Harvested rainwater can be used for irrigation, toilet flushing, or cleaning, making it a practical addition for commercial and residential developments alike.

Enhanced Water Quality Treatment

Where water quality is a concern, advanced treatment features can be incorporated into SuDS designs. Examples include proprietary filter systems, constructed wetlands, or bioretention areas that remove pollutants before water enters surface water bodies or sewers.

Overcoming Site Constraints with Smart Design

Challenging sites often require a tailored combination of SuDS features. Early engagement with drainage specialists and local authorities is key to identifying constraints and developing compliant, effective solutions. At The Drainage Designers, we work closely with architects, developers, and engineers to ensure every project achieves the best possible outcome—balancing regulatory compliance, sustainability, and practicality.

By embracing advanced SuDS features, even the most complex sites can achieve robust, future-proof drainage strategies that protect both people and the environment.

If you have any questions about drainage, you can ask them instantly by clicking on our new AI chatbot: Ask a Drainage Question. 

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