SuDS in practice: Building low carbon, community led, long lasting solutions

SuDS at a Turning Point

Sustainable Drainage Systems (SuDS) mimic natural processes to manage rainwater runoff, reducing flood risks, improving water quality, and enhancing urban environments through features like permeable surfaces, swales, ponds, and wetlands.

Recent developments have accelerated attention to SuDS in England. In June 2025, the government released updated National Standards for Sustainable Drainage Systems, the first major revision since 2015. These standards promote a natural, source-control approach over conventional piped drainage, requiring consideration of multiple benefits including biodiversity net gain and climate resilience. They align with updates to the National Planning Policy Framework in 2024 and 2025, which now require SuDS in developments with drainage impacts where practicable.

Despite these advances, Schedule 3 of the 2010 Flood and Water Management Act—intended to make SuDS mandatory for new developments with approval by local SuDS Approving Bodies (SABs)—remains uncommenced in England. The government has repeatedly deferred a final decision, citing potential improvements through planning policy and maintenance arrangements instead. This leaves implementation uneven, with reliance on local planning authorities' interpretation and voluntary adoption.

The stakes are concrete and mounting. England has seen repeated surface water flooding incidents, with costs running into billions annually; the Environment Agency estimates surface water flood risk affects over 3 million properties. Combined sewer overflows, exacerbated by heavy rainfall and urbanisation, pollute rivers and coastal waters, drawing scrutiny from environmental groups and the Independent Water Commission (2025 report). Developers face delays in planning approvals without robust SuDS proposals, while future-proofing against more frequent extreme rainfall—projected to increase with climate change—demands upfront investment.

Non-obvious tensions persist. Low-carbon and community-led SuDS can reduce embodied emissions from materials and foster local ownership for better maintenance, but they often require more land or innovative designs that clash with tight urban sites or brownfield redevelopment priorities. Long-lasting solutions demand clear adoption and funding mechanisms, yet many local authorities lack resources for oversight, risking neglected systems that fail to deliver promised benefits. Industry voices highlight that without statutory backing, progress remains patchy, potentially leading to higher long-term societal costs from inaction on flooding and pollution.

These factors converge now as housing targets demand rapid development, water companies face legal obligations to consider nature-based solutions under 2025 legislation, and public pressure grows for resilient, multifunctional infrastructure.