{"id":153810,"date":"2026-02-25T08:50:23","date_gmt":"2026-02-25T08:50:23","guid":{"rendered":"https:\/\/greenblue.com\/?p=153810"},"modified":"2026-02-25T08:58:08","modified_gmt":"2026-02-25T08:58:08","slug":"nature-based-suds-should-be-the-default-whats-holding-them-back","status":"publish","type":"post","link":"https:\/\/greenblue.com\/gb\/nature-based-suds-should-be-the-default-whats-holding-them-back\/","title":{"rendered":"Nature-based SuDS should be the default. What\u2019s holding them back?"},"content":{"rendered":"

For more than a decade, the UK has broadly agreed on the direction of travel for surface water management. Policy documents reference it. Guidance supports it. Demonstration projects prove it. Designers increasingly understand how to deliver it.<\/strong><\/p>\n

And yet, across much of England, nature-based Sustainable Drainage Systems (SuDS) are still often delivered through planning negotiation rather than embedded as a baseline assumption.<\/p>\n

The question is no longer whether SuDS are desirable, it\u2019s why they remain discretionary.<\/p>\n

The risk profile has already changed<\/strong><\/p>\n

Recent winters have offered a familiar pattern: saturated ground, repeated rainfall events and localised flooding<\/a><\/strong> triggered less by rivers overtopping than by water failing to go anywhere once it reaches hard surfaces.<\/p>\n

Recently, the Environment Agency<\/a><\/strong> has issued flood warnings in 99 areas following a record-breaking month of rain, the wettest on record for several areas. If flood warnings are becoming routine rather than exceptional, then distributed surface water control should be routine too.<\/p>\n

This is precisely the kind of risk profile SuDS were conceived to address \u2013 distributed, cumulative, and strongly influenced by how urban land is surfaced and drained. They are designed to replicate natural drainage processes by managing rainfall close to where it lands, reducing both runoff volumes and pollution entering conventional sewers. That multifunctional role is now well understood.<\/p>\n

In technical terms, the case has largely been settled.<\/p>\n

The legislative tool exists \u2013 but remains unused<\/strong><\/p>\n

Schedule 3 of the Flood and Water Management Act 2010 was intended to embed SuDS into development through an approval and adoption framework, but 15 years later, it is still not in force in England.<\/p>\n

As the Commons briefing Sustainable drainage systems (SuDS)<\/em> (Research Briefing CBP-10483, published in February 2026) confirms, while Wales has implemented Schedule 3, England has instead relied on planning policy to encourage SuDS uptake rather than mandate it. That decision has had a subtle but important consequence: SuDS are supported in principle, but optional in practice.<\/p>\n

This creates an unusual policy position: climate risk is acknowledged as systemic, yet one of the most spatially adaptable mitigation tools remains discretionary. This creates a gap between national adaptation ambitions and the mechanisms available to deliver them consistently.<\/p>\n

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Wales has already implemented Schedule 3<\/figcaption><\/figure>\n

Encouragement is not the same as integration<\/strong><\/p>\n

Planning policy, including the National Planning Policy Framework (NPPF), expects major developments to incorporate SuDS unless there is clear evidence that this would be inappropriate. But an expectation filtered through planning negotiation is not the same as a statutory design baseline. Without a parallel approval and adoption mechanism, delivery inevitably depends on interpretation rather than a consistent statutory baseline.<\/p>\n