{"id":152681,"date":"2025-07-17T11:42:36","date_gmt":"2025-07-17T10:42:36","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=152681"},"modified":"2025-07-17T11:42:36","modified_gmt":"2025-07-17T10:42:36","slug":"suds-standards-vital-step-forward-but-risk-going-down-the-drain","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/suds-standards-vital-step-forward-but-risk-going-down-the-drain\/152681\/","title":{"rendered":"SuDS standards move is a vital step forward \u2013 but does it risk going down the drain?"},"content":{"rendered":"<h2>Alastair Chisholm, director of policy at the <a href=\"https:\/\/www.ciwem.org\/\" target=\"_blank\" rel=\"noopener\">Chartered Institution of Water &amp; Environmental Management (CIWEM)<\/a> welcomes the government\u2019s newly published National Standards for Sustainable Drainage Systems. While they are a significant improvement on the previous ones, he argues that they may fall short if not backed by a rules-based mandate<\/h2>\n<p>Sustainable drainage systems <a href=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/how-innovative-sustainable-drainage-systems-suds-can-help-cities-keep-their-heads-above-water\/120551\/\" target=\"_blank\" rel=\"noopener\">(SuDS) have been crucial for building climate resilience into our built environments<\/a> for decades. As climate change has progressed, their value (and limitations) have become more widely recognised. To the initiated, they\u2019re a no-brainer.<\/p>\n<p>SuDS absorb water near to where it falls, like a sponge, reducing surface water flood risk. They can reduce the elevated heat stored and emitted by hard surfaces like concrete and tarmac, helping reduce the urban heat island effect. They also keep rainwater out of networks, reducing the frequency of storm overflow discharges to the environment.<\/p>\n<p>The list goes on. SuDS can filter and treat microplastics and carcinogenic toxins that flow from roads into streams and rivers, poisoning them. They support increased pollinator, invertebrate, amphibian and plant species populations, and promote wellbeing among local human populations.<\/p>\n<h3>SuDS only achieve benefits when well-designed<\/h3>\n<p>This has been known for years. Detailed design standards were created under Schedule 3 of the <a href=\"https:\/\/www.legislation.gov.uk\/ukpga\/2010\/29\/schedule\/3\" target=\"_blank\" rel=\"noopener\">2010 flood management law<\/a>, only to be reduced to two pages in 2015.<\/p>\n<p>Ten years of infuriating drift ensued, wasting the potential of SuDS and preventing them from becoming mainstream \u201cdrainage\u201d rather than \u201csustainable drainage\u201d to developers, planners and others.<\/p>\n<p>SuDS are delivered in new developments, yes, but they\u2019re often shoehorned into sites after they\u2019re laid out. They are most effective and efficient when mapped out first to harness natural drainage flows. They\u2019re often \u201cvalue engineered\u201d to deliver the minimum technical requirements, resulting in duds rather than SuDS.<\/p>\n<p>The new standards go some way to resurrect the 2010 design standards developed under the last Labour government. While some may miss fine detail, for others like developers and planners, they clearly set out design and performance characteristics to unlock SuDS\u2019 multifunctional armoury.<\/p>\n<p>They cover requirements relating to everyday rainfall drainage and storage, flood risk, water quality, amenity and biodiversity, alongside long-term maintenance and drainage destinations. In other words, the specifications necessary to unlock the drainage equivalent of a Swiss army knife.<\/p>\n<h3>Delivery still not guaranteed<\/h3>\n<p>The statutory approach set out by Schedule 3 was regarded as too rigid and prescriptive, leading to developer lobbying that killed it in 2014.<\/p>\n<p>A government review in 2022 recommended a mandatory approach to address escalating pressures on builders to deliver necessary performance. Despite supporting it in opposition, the government seems unable to reconcile this with its housing delivery red tape-trimming ambitions.<\/p>\n<p>Schedule 3 is not universally liked, and faces opposition. Its implementation in Wales provided valuable lessons. Change will require adjustments within the developer\u00a0 community and capacity building in local authorities, with an appropriate glide path. However, Schedule 3 is robust.<\/p>\n<p>The government appears keen to use the <a href=\"https:\/\/www.pbctoday.co.uk\/news\/planning-construction-news\/industry-reacts-national-planning-policy-framework\/135769\/\" target=\"_blank\" rel=\"noopener\">National Planning Policy Framework<\/a> (NPPF) as a driver as it prescribes multifunctional SuDS. However, there\u2019s a problem with this approach. The NPPF is not mandatory; it\u2019s guidance, and its terminology suggests \u201cshould\u201d rather than \u201cmust\u201d or \u201cshall\u201d.<\/p>\n<p>This distinction is crucial. Planners must judge whether SuDS are appropriate or technically fit for purpose in a development. This is open to interpretation, too often leading to an adversarial climate between planners, lead local flood authorities and developers over what<br \/>\ngets taken forward.<\/p>\n<p>Planning conditions requiring good drainage due to surface water flood risk are often challenged and appealed by developers. If defended by cash-strapped authorities this wastes time, public money and often results in new developments with unnecessarily high flood risk.<\/p>\n<p>Aspirations over wider benefits are often unrealised. This ultimately benefits lawyers\u2019 and developers\u2019 bottom lines, not the government\u2019s housing ambitions, due to potential disputes and delays. The new standards will be largely cosmetic unless this issue is resolved. Adoption and maintenance are also concerns. NPPF guidance recommends maintenance arrangements for the development\u2019s lifetime, but this rarely happens.<\/p>\n<p>The new standards assign single-property SuDS to owners and multiple-property SuDS to an \u201cappropriate authority,\u201d but the authority is not specified. A rules-based approach is necessary for clarity, consistency, and translating design into outcome delivery. It should also clarify the adopting authority.<\/p>\n<p>The current choice is between Schedule 3 and planning-led mechanisms. Could there be a third way? We believe there could: one that mirrors existing infrastructure approval, adoption and maintenance arrangements familiar to developers.<\/p>\n<p>This could unlock the same multifunctional outcomes from SuDS as Schedule 3, but in a more streamlined way. There would be rules similar to Schedule 3, but there are now too,<br \/>\nwith the new standards.<\/p>\n<p>Instead of creating a new approving body, consolidating local authority responsibilities for highway, land drainage and public realm management around SuDS at the upper tier or unitary level for SuDS management makes sense. Nesting adoption within local authorities keeps it close to local planning.<\/p>\n<p>As far as funding maintenance goes, the existing surface water drainage charge in water bills is the obvious source. With minor legislative adjustments, this funding could support SuDS maintenance.<\/p>\n<p>The planning approach hasn\u2019t worked and new standards won\u2019t eliminate ambiguity or scope for challenge that attracts less-invested developers. It will remain a battleground and a mess as climate change and sewage infrastructure pressure intensify.<\/p>\n<div class=\"mk-custom-module-container\">\n<\/div>","protected":false},"excerpt":{"rendered":"<p>CIWEM&#8217;s Alastair Chisholm welcomes newly published National Standards for SuDS, but argues that they may fall short if not backed by a rules-based mandate.<\/p>\n","protected":false},"author":24,"featured_media":152683,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[306],"tags":[173096,648],"stakeholder_rel_tag":[],"contributor_rel_tag":[173095],"class_list":{"0":"post-152681","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-building-control-news","8":"tag-pbc-today-august-2025","9":"tag-suds"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>SuDS standards move is a vital step forward \u2013 but does it risk going down the drain? | Planning, Building &amp; 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