Sustainable urban drainage designers and installers, bioswales, rain gardens, permeable paving, and green roofs.

    Find a SuDS & Green Infrastructure Provider

    Matched providers: 26

    Top countries: United Kingdom, Belgium

    Popular technologies: Filtration, Fixed Bed Activated Carbon Adsorbers

    SuDS and Green Infrastructure: Blue-Green Design, WSUD, and Urban Water Management

    Green infrastructure and sustainable urban drainage systems (SuDS) integrate ecological, hydrological, and urban design principles to manage stormwater and surface water in urban environments while delivering multiple co-benefits (biodiversity, urban cooling, air quality, wellbeing). Blue-green infrastructure typologies: green roofs (extensive: substrate 60 to 200 mm, sedum/wildflower, weight 60 to 150 kg/m2 saturated; intensive: substrate 200 mm to 1,000 mm, planted trees and shrubs, weight 200 to 500 kg/m2; FLL Guidelines (German Green Roof Association) and BS 8495 specification); rain gardens (shallow depressions planted with flood-tolerant species: Persicaria bistorta, Lythrum salicaria, Geranium sanguineum; infiltration-based or lined with outlet; ponding depth 100 to 300 mm for 4 to 24 hours storm storage); bioretention cells (engineered soil profile: 50 mm mulch layer, 400 to 600 mm bioretention media (sandy loam, 20 to 30 percent fines, k = 10-4 to 10-5 m/s), optional underdrain; phosphorus removal by adsorption in media; nitrogen removal by denitrification; heavy metal removal 60 to 90 percent); swales (vegetated channels; flow velocity less than 0.5 m/s for 1-in-10-year event; Manning's n = 0.02 to 0.04 for well-maintained grass; minimum 0.5 percent slope to prevent ponding; typically 600 mm to 1,200 mm wide; overflow structures at regular intervals).

    Water sensitive urban design (WSUD) as a systems approach: WSUD integrates water supply, wastewater, and stormwater management into urban planning at master plan stage; originating in Australian practice (Melbourne Water WSUD guidelines, 2005) and adopted widely in UK (CIRIA C753 SuDS Manual, 2015; Newcastle Blue-Green Cities project; Glasgow Urban Big Water project; Sheffield Blue-Green Infrastructure programme funded by EPSRC). WSUD principles: minimise impervious surfaces (target impervious fraction less than 30 percent for new development in water-sensitive design); maximise infiltration (permeable paving for low-traffic areas: CIRIA C754; concrete block permeable paving: BS EN 1338; porosity 15 to 25 percent; hydraulic conductivity greater than 100 mm/h); harvesting and reuse of stormwater and greywater for non-potable uses (toilet flushing, irrigation, cooling towers; savings 30 to 50 percent of mains water demand). Urban heat island mitigation: green roofs reduce peak surface temperature by 10 to 30 degrees C compared to conventional rooftops; urban trees provide evapotranspiration cooling (single mature tree transpires 200 to 400 L/day in summer; cooling effect equivalent to 5 to 10 air conditioning units); blue spaces (ponds, streams, fountains) provide 1 to 3 degrees C local air temperature reduction. Biodiversity Net Gain (BNG): mandatory for new developments over 10 dwellings (under Environment Act 2021, commencement April 2024) requiring 10 percent BNG; SuDS and green infrastructure contribute to habitat creation units (HU) under the Defra BNG metric (version 4.0).

    Planning policy and green infrastructure standards: National Planning Policy Framework (NPPF) Paragraph 96 requires LPAs to apply policies to protect and enhance biodiversity and green infrastructure; LDP Green Infrastructure policies require GI provision for major developments; Bristol, Manchester, Leeds, and London have adopted city-wide Green Infrastructure Frameworks. London Plan Policy G5 (Urban Greening Factor, UGF) requires all major developments to achieve a target UGF score (residential: 0.4; commercial: 0.3) using weighted scoring for different types of green surface (green roof: 0.7; bioretention: 0.7; grass: 0.3; trees: 2.0 multiplier based on canopy coverage); UGF assessment submitted with planning application. Trees and tree root zones: BS 8545 (trees: from nursery to independence in the landscape); NJUG Volume 4 (utility installation near trees); BS 5837:2012 (trees in relation to design, demolition, and construction); TEMPO model (Trees and Design Action Group, TDAG) for urban tree benefits assessment; root protection area (RPA) calculation: 12 x stem diameter for standard calculation. Maintenance and adoption: SuDS green infrastructure requires specialist long-term maintenance (vegetation management, sediment removal, outlet inspection); LLFA and sewerage undertaker adoption criteria specify maintenance schedule in adoption agreement; management companies (Greenbelt, Idverde, Ground Control) specialize in SuDS maintenance contracts.

    Frequently Asked Questions

    What is the Biodiversity Net Gain requirement and how does green infrastructure contribute?

    Biodiversity Net Gain (BNG) became mandatory for all new major developments in England from April 2024 under the Environment Act 2021, requiring developers to demonstrate a 10 percent net gain in biodiversity units above the pre-development baseline. BNG is calculated using the Defra Statutory Biodiversity Metric (version 4.0, 2023): pre-development habitat units (HU) quantified by habitat type (e.g. species-rich grassland, woodland, urban), area, and condition; post-development habitat units calculated using same methodology including retained and newly created habitats; net change must be at least +10 percent. Green infrastructure contributions to BNG: wildflower green roofs (BBSF score: 0.3 to 0.5 HU/100 m2 depending on sedum vs wildflower mix); bioretention rain gardens with native planting (0.4 to 0.6 HU/100 m2); wetland SuDS ponds (0.8 to 2.0 HU per pond depending on size and habitat quality); habitat corridors (swales planted with native marginals: 0.3 to 0.5 HU/100 m linear); urban trees (counted separately under canopy cover metric; BS 5837:2012 retention plan). BNG process: pre-application biodiversity baseline survey (Phase 1 Habitat Survey by ecologist, NVC for grasslands); Biodiversity Metric 4.0 calculation submitted with planning application; BNG plan stating how 10 percent gain achieved on-site, off-site, or via statutory biodiversity credits (purchased from EA at GBP 42,000 to GBP 650,000 per credit depending on habitat type); LPA conditions require 30-year maintenance and monitoring plan; legal agreement (planning obligation or BNG agreement under Section 106 Town and Country Planning Act 1990) secures long-term management.

    What is a green roof and what types are available?

    Green roofs are vegetated roof systems installed on building rooftops, comprising a waterproof membrane, drainage layer, growing substrate, and vegetation. Types: (1) Extensive green roof: thin substrate 60 to 200 mm (typically 80 to 120 mm); lightweight 60 to 150 kg/m2 saturated; low-maintenance drought-tolerant vegetation (sedum species: S. acre, S. album, S. spurium; wildflower mixes for BNG); minimal or no irrigation after establishment; installed on roofs with 1 to 25 percent pitch; cost GBP 50 to 150/m2 supply and install. (2) Intensive green roof: substrate 200 mm to 1,000 mm; heavyweight 200 to 500 kg/m2 saturated; supports trees, shrubs, and perennials; requires irrigation system and regular maintenance (mowing, pruning); structural roof assessment required; cost GBP 150 to 500/m2. (3) Semi-intensive green roof: intermediate 100 to 250 mm substrate; mix of sedum, grasses, and perennials; moderate maintenance; cost GBP 80 to 200/m2. (4) Biodiverse/brown roof: substrate mix includes crushed aggregate, sand, and low-fertility subsoil; designed for invertebrate and bird habitat rather than visual appearance; mandated by London Plan for flat roofs on major developments. Performance: stormwater retention (extensive: 10 to 50 mm/event depending on substrate depth and antecedent moisture; intensive: 50 to 100 mm/event); thermal insulation (U-value improvement 0.1 to 0.2 W/m2K); urban heat island reduction (surface temperature 10 to 30 degrees C lower than conventional roof in summer). Standards: FLL Guideline for the Planning, Performance, and Maintenance of Green Roofing (Germany, adopted as UK reference standard); BS 8495:2007 (Code of practice for installation of drainage in green roof systems); WRAP Green Roof Toolkit.

    What planning policies require green infrastructure in UK developments?

    UK planning policies requiring green infrastructure: (1) NPPF (National Planning Policy Framework) England: Paragraph 96 requires LPAs to apply policies to protect and enhance green infrastructure; Paragraph 136 requires ecological networks are maintained and enhanced; BNG mandatory from April 2024 (Environment Act 2021, Schedule 7A). (2) London Plan (2021): Policy G5 (Urban Greening Factor, UGF): major residential development must achieve UGF 0.4, major commercial development UGF 0.3; calculated using GLA UGF calculator; Policy G6 (Biodiversity and Access to Nature): major developments in deficiency areas must deliver accessible nature. (3) Wales: Future Wales National Plan; Planning Policy Wales (PPW) Edition 12 (2024): Section 6.4 requires LPAs to protect and enhance green infrastructure; Well-being of Future Generations (Wales) Act 2015 places sustainability duty on all public bodies including LPAs; TAN 15 (Technical Advice Note) on development and flood risk. (4) Scotland: Scottish Planning Policy (SPP) 2014: green infrastructure promoted for climate change adaptation; Biodiversity Net Gain included in NPF4 (National Planning Framework 4, 2023). (5) Specific LPA policies: Greater Manchester Green Infrastructure Standards (GMCA, 2023); Leeds City Region Green Infrastructure; Bristol City Council Urban Living SPD requiring 30 percent green coverage on rooftops. (6) Environment Act 2021 provisions: mandatory BNG; Local Nature Recovery Strategies (LNRS) to guide GI placement; Species Conservation Strategies (SCS). Developers must submit Green Infrastructure Plan or Landscape and Ecological Management Plan (LEMP) with planning applications for major sites.

    What maintenance do SuDS and green infrastructure features require?

    SuDS and green infrastructure maintenance requirements: Green roofs: extensive roofs: twice-yearly inspection (spring and autumn); weed removal (particularly invasive species, tree seedlings); clearing of drains and outlets; dead vegetation clearance after winter; occasional reseeding of bare patches; annual cost GBP 1 to 5/m2. Intensive roofs: monthly inspection; irrigation management; seasonal planting; structural maintenance; annual cost GBP 10 to 30/m2. Bioretention and rain gardens: annual inspection of soil permeability (falling head test; target k greater than 10 mm/h; replace or scarify if clogged); vegetation management (2 to 4 cuts per year; removal of non-native invasives; replanting gaps); sediment removal from surface (when sediment depth reaches 50 mm; typically every 2 to 5 years depending on catchment); outlet inspection; annual cost GBP 2 to 8/m2. Swales: grass cutting 4 to 6 times per year; weed control; sediment check dam inspection; outlet inspection after storm events; annual cost GBP 1 to 3 per linear metre. Detention basins and ponds: annual inspection of outlet structure; bathymetric survey every 5 to 10 years (when sediment reduces storage volume by 20 percent, dredge); vegetation management (marginal plants cut annually; invasive species removal); litter clearance; annual cost GBP 0.50 to 2.00/m2 water surface. Contractual arrangements: specialist SuDS maintenance contracts through Idverde, Greenbelt, Ground Control, Nurture Landscapes; maintenance schedule specified in LLFA adoption agreement or Section 106 agreement; estate management company (EMC) typically holds maintenance obligation for privately adopted SuDS on residential developments. Regulatory: EA may require inspection records for adopted SuDS; annual maintenance report submitted to LLFA in some authorities.

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    SuDS & Green Infrastructure Companies

    Sustainable urban drainage designers and installers, bioswales, rain gardens, permeable paving, and green roofs.

    26 providers

    This page is a good fit if you need:

    • Filtration or Fixed Bed Activated Carbon Adsorbers capabilities
    • Suppliers with networks - sewerage sector experience
    • Providers operating in United Kingdom or Belgium
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    Find a SuDS & Green Infrastructure Provider

    Showing 1-20 of 26

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    Devram International logo

    Devram International

    Verified
    India1-50 employees
    Granular Activated Carbon (GAC) Filters · Fixed Bed Activated Carbon Adsorbers · Powdered MOF Adsorbent Systems +19 more
    apac · mea

    DEVRAM INTERNATIONAL, headquartered in Surat, India, is a pioneering enterprise specializing in Snow and Rainwater Management with advanced contamination reduction abilities for storage and artificial groundwater recharge. Established as the commercial wing of Shree Someshwar Education Trust (SSET), DEVRAM INTERNATIONAL is driven by a mission to provide tech-enabled, nature-based solutions that address the world’s most pressing water and climate challenges. The company’s work integrates Integrated Water Resources Management (IWRM) principles and contributes across the source-to-sea water management cycle, ensuring holistic restoration of the global water cycle. Its innovative portfolio includes rainwater harvesting systems, stormwater management, aquifer recharge, artificial glaciers, desert trenches, rooftop water filtration, and green infrastructure models. These interventions directly reduce salinity in soils and aquifers, restore ecological balance, and enhance resilience to droughts, floods, and climate change. As the commercial promoter of the Global Rainwater Management Program (GRMP), DEVRAM INTERNATIONAL advances the vision of GRMP as a Global Common Minimum Program (GCMP) for nations and international bodies. GRMP demonstrates how rainwater and snowwater retention can restore entire natural cycles, while delivering unmatched benefits across the Sustainable Development Goals (SDGs). Alignment with the SDGs • SDG 2 (Zero Hunger): By reducing soil salinity, supporting organic farming, and ensuring water availability for agriculture, GRMP safeguards food security. • SDG 6 (Clean Water & Sanitation): DEVRAM’s recharge structures and contamination reduction technologies guarantee safe, sustainable drinking water for communities. • SDG 7 (Affordable & Clean Energy): By reducing dependency on energy-intensive desalination, GRMP lowers national energy bills and improves hydropower capacity. • SDG 9 (Industry, Innovation & Infrastructure): DEVRAM integrates nature-based water infrastructure with industrial operations, reducing OPEX and water footprints. • SDG 11 (Sustainable Cities & Communities): Through stormwater management and aquifer recharge, GRMP mitigates urban flooding and secures municipal supplies. • SDG 12 (Responsible Consumption & Production): Promotes a circular water economy, reusing wastewater, biogas from organic waste, and aligning with industrial CSR. • SDG 13 (Climate Action): By lowering GHG emissions and cooling local climates through water cycle restoration, GRMP strengthens resilience to global warming. • SDG 14 (Life Below Water): Free-flowing rivers, improved aquaculture, and reduced dam-related aquatic pollution support marine and freshwater ecosystems. • SDG 15 (Life on Land): DEVRAM’s interventions restore wetlands, mangroves, peatlands, and biodiversity-rich ecosystems, addressing land degradation. • SDG 17 (Partnerships for the Goals): The company actively collaborates with UN agencies, governments, World Bank programs, and private investors to scale GRMP globally. Founders and Leadership Dhaval Pandya, Co-Founder of DEVRAM INTERNATIONAL and CEO of SSET, is a globally recognized sustainability leader. He co-developed the Global Rainwater Management Program (GRMP), recognized by the United Nations Global Water Partnership (GWP) and the Government of India. As a Technical Committee Member (WRD03) of the Bureau of Indian Standards (BIS), he contributes to national water policy frameworks. His work is featured in UNCCD IWRM Action Hub and global forums like COP, Stockholm World Water Week, and World Bank SDG reviews. Manalika Pandya, Co-Founder, plays a critical role in embedding social, gender, and educational dimensions into GRMP. Her focus on women empowerment, local capacity building, and community-driven adoption ensures the program’s sustainability at the grassroots. Impact and Recognition DEVRAM INTERNATIONAL has piloted groundbreaking projects such as: Kawas Village (Gujarat, India): A GRMP model village achieving self-reliance in water, organic farming, and biogas, while resolving conflicts with industries. Delhi’s Water Paradox (Figshare Study): Shows how GRMP can solve megacity water crises without costly desalination or dams. GSECL Surat Project: Demonstrates reduced industrial water costs through GRMP recharge planning, aligning profitability with SDG and ESG goals. These projects show GRMP’s potential to reduce industrial and municipal water supply costs by up 60%, avoid massive investments in desalination and dams, and enable nations to achieve water sovereignty. Core Competencies • Rainwater & Snowwater Harvesting • Artificial Groundwater Recharge & Salinity Reduction • Stormwater Management & Urban Flood Control • Transboundary Water Cooperation • IWRM & Source-to-Sea Water Governance • AI-Enabled Hydrological Modelling & Policy Analytics • Environmental Services Restoration (Wetlands, Mangroves, Peatlands) • Circular Economy.

    Activated Carbon Filtration
    Granular Activated Carbon (GAC) Filters
    Multi-media Filtration (MMF) Systems
    +25 more
    manufacturing
    utilities
    Ecosystems International logo

    Ecosystems International

    Verified
    Indonesia51-200 employees
    Flat Sheet Microfiltration Units · Hollow Fiber MF Systems · Ceramic Microfiltration Modules +80 more
    apac · china · europe +3 more

    PT Ecosystems International (PT ESI) was established at Jakarta on 21st November 2006. We are an industrial effluent treatment systems integrator specializing in electrocoagulation (EC), a unique waste water treatment profile. PT ESI has capabilities in designing complete waste water treatment solutions by combining various effluent treatment systems such as the electro-coagulation, biological, chemical processes and membrane filtration, offering its customers a wide and comprehensive range of solutions, tailored to suit their various needs – ranging from basic effluent treatment for discharge to effluent recycling for water reuse. The Company is experienced in handling the design, engineering, procurement, construction and operation of new Effluent Treatment Plants (“ETP”) and possesses expertise in retrofitting existing ETP to increase the flow rate and treatment capability without any major infrastructure increase PT ESI is also a premier waste water treatment service company specializing in handling waste water generated from Exploration (Drilling) and Produced Water. Customers in Indonesia include major Oil & Gas companies such as Pertamina, Exxon, Chevron, Petro-China and Medco. Operations in Indonesia are provided by both mobile and fixed units. At drill sites where waste-water recycling is required, PT ESI supplement these treatment units with skid mounted mobile Reverse Osmosis systems. The technologies and solutions employed by PT ESI are developed in-house and examples of these are its proprietary Trident™ Electro Contaminant Removal (“ECR”) system, the Stage Contaminant Removal (“SCR”) process and Mobile On-Site Waste-Water Treatment (“OWT”) units

    Reverse Osmosis (RO) Systems
    Ultrafiltration (UF) Systems
    Multi-media Filtration (MMF) Systems
    +63 more
    agriculture
    manufacturing
    Guangzhou Haike Electronics Technology Co., Ltd. logo

    Guangzhou Haike Electronics Technology Co., Ltd.

    China200+ employees
    Filtration · Activated Carbon · Fixed Bed Activated Carbon Adsorbers +3 more
    apac · china

    Guangzhou Haike Electronics Technology Co., Ltd. is a leading manufacturer of air and water purification systems, specializing in advanced filter technology. With a strong global presence, HOKO collaborates with Fortune 500 companies, producing high-quality smart home appliances and exporting to over 100 countries.

    Point-of-Use (POU) Filters
    UV Disinfection
    Manufacturing
    Healthcare
    Pollet Water Group logo

    Pollet Water Group

    Belgium200+ employees
    Filtration
    europe

    Over three decades, Pollet Water Group has been thinking water. It’s our mission to improve the quality of life, the comfort of doing business and the efficiency of industrial processes through a network of specialized water treatment companies.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Industrial WWTPs
    +1 more
    Utilities
    Manufacturing
    DALI - Pipeline Monitoring logo

    DALI - Pipeline Monitoring

    Belgium1-50 employees
    europe

    DALI - Pipeline Monitoring specializes in advanced real-time leak and intrusion detection for pipelines using Distributed Acoustic Sensing (DAS) and fiber optic technology. Their solutions help utility companies and industrial facilities minimize Non-Revenue Water (NRW) losses, reduce waste, and prevent costly incidents, ensuring efficient pipeline management.

    Online/Real-Time Monitoring
    Remote Sensing and Telemetry
    IoT and Smart Monitoring
    Utilities
    Public Administration
    RammSanderson logo

    RammSanderson

    United Kingdom

    RammSanderson is one of the fastest growing multi-disciplinary consultancies in the UK. Already partnered with some of the largest water infrastructure companies in England, RammSanderson specialises in: Ecology Flood risk management Arboriculture Habitat management Providing a pragmatic and cost-effective approach to projects on either a site-specific or framework basis, RammSanderson is founded on the principles of customer service, technical excellence, and pragmatic solution-based consulting. The company was founded in 2014 by Oliver Ramm, Nick Sanderson and Anthony Mellor, since when it has grown from strength to strength, with a diversified client portfolio spanning across infrastructure, utilities, commercial and residential sectors. Initially focusing primarily on ecology, the company has grown to encompass a wide variety of environment-based disciplines. This approach has yielded a multitude of benefits, allowing each individual discipline to effortlessly draw knowledge from a wider set of specialists while also allowing seamless delivery and straightforward accountability on more complex multidisciplinary projects.

    Designers
    Vegetation Management
    PBJ Engineering Services Ltd logo

    PBJ Engineering Services Ltd

    United Kingdom

    Do you need Thermal Hydrolysis Plant operational support, training and maintenance? Does your critical water process equipment require contract support and safety assurance? Visualise your assets and maintain operational efficiency through our 360 degree image capture. Invest in your operations through our professional training and technical support services. PBJ Engineering delivers a range of services to support your wastewater treatment and process facilities – we specialise in THP systems and Steam Boiler services, including CEA and BOAS accreditation.  Our team is available nationally to support you, on a contract, project or emergency basis. Supporting your facility and team with a programme custom designed to your needs, typically includes elements of: Whole System Contracts Consultation and Best Practice Commissioning and Maintenance Optimisation and Monitoring Refurbishment and Rebuild Component Fabrication and Supply Training for BOAS and CEA accreditation Some of our typical on-site activities include full capabilities in; Thermal Hydrolysis Plants Steam Boilers Sludge Dewatering Processes Water Treatment Coil and Heat Exchangers Pumps Our ancillary support services includes; 360O Image Capture – Virtual Plant Training and Maintenance Boiler Log Books – Custom design & print Boiler House design – Advice and guidance Equipment – Hire services and component spares Our priority is the safety of all personnel and the operational efficiency of your facilities.  We work with you and your team, to maintain and support your infrastructure – protecting your people, investment and optimising your asset performance. Our team is qualified with CITB / SMSTS, Achilles, and CEA / BOAS. Project involvement includes: Thames Water: Basingstoke THP (commissioning, operation, training, optimisation, maintenance) Beckton THP (energy surveys) Chertsey THP (operation, training, optimisation) Crawley THP (commissioning, operation, training, maintenance, part supply) Crossness THP (operation, optimisation, energy reduction, training, energy surveys) Longreach THP (operation, training, optimisation) Oxford THP (operation, optimisation, fault finding) Riverside THP (water treatment installation, design, energy surveys) Severn Trent: Finham THP (operational support) Strongford THP (operation, training) Southern Water: Goddards Green THP (operational support & performance monitoring) Others: Nestles – Trowbridge – steam boiler operational contract (24 hour call out) Heathrow airport – hot water boiler – scale cleaning

    Renewables & Energy Management
    Asset Maintenance & Rehabilitation
    AJ Engineering & Construction Services Ltd logo

    AJ Engineering & Construction Services Ltd

    United Kingdom

    AJ Engineering & Construction Services Ltd provide a wide spectrum of engineering services ranging from steel fabrication and CNC machining to cladding and civil engineering, with our highly experienced team we provide on-time, on-budget quality solutions. From our bases in Forres and Fort William, and a team accustomed to travel we can meet our client’s needs wherever required. Having worked on various water and wastewater treatment projects for the past 25 years we have developed a great working relationship with water companies across the UK. Our in-house capabilities allow us to offer a turnkey service to our clients from reactive maintenance and manufacturing to planned infrastructure and non-infrastructure projects. Many of the projects we undertake in the water sector are within water treatment and wastewater treatment plants where cleanliness is paramount, all our water sector site teams hold certification and Water Hygiene cards. Our range of services collated into one means that we can take on multiple discipline contracts and deliver them as one which provides our clients with a number of advantages. It removes the need to have multiple contractors on site at once. Benefits in cost savings passed down on procuring large amounts of steel for a side wide project. Little risk of dimensional discrepancies between contractors We work alongside framework delivery partners throughout the UK providing the services below; Steel portal frame buildings (design, fabrication, erection & cladding) Design, manufacture and installation of pipe bridges Design, manufacture and installation of site wide access metalwork (walkways, access stairs, ladders etc) Design, manufacture and installation of modular water buildings transportable by road. Design of various process tanks, pipework and pumps. Fabrication of tanks and pipework (stainless and carbon) Mechanical Installation Modular Treatment Buildings and Mechanical Fit-out SR2 rated steel enclosures (quicker than GRP Kiosks) We appreciate how important quality and cleanliness is in the water sector and we are proud that we have completely segregated facilities for stainless steel and carbon steel. In addition to this we are also approved under the regulations 31(4)(A) of the water supply regulations 2016 to supply stainless steel and pipework fabrications to the drinking water sector.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Saint Gobain PAM UK logo

    Saint Gobain PAM UK

    United Kingdom

    Saint Gobain PAM UK is the premier supplier of ductile iron and cast iron products to the UK's key utilities, telecoms, highways, civil engineering, construction and housing companies. We’re a leading manufacturer of ductile iron access covers, gully gratings, and pressure pipeline systems, helping the UK’s utility, highways, telecoms and infrastructure network owners reduce their whole-life costs and carbon while improving their asset durability and health and safety standards. We proudly manufacture our solutions, which enables us to not only meet but exceed the most stringent safety, quality and environmental standards. This means all of our access covers, gully gratings, and surface boxes are 100% recyclable. By providing innovative and sustainable access covers, gully gratings and pipeline systems that are right the first time, our customers enjoy quality and durable solutions that solve their problems the first time they’re installed – backed by the experts who designed them. 👨‍🔬🔬🥼 Saint-Gobain PAM UK is part of the Saint-Gobain Group, which employs over 166,000 people in 75 countries. With the international support of parent company Saint-Gobain, we offer unrivalled technical support, a total solution approach and unparalleled quality and innovation. Our solutions include: Ductile iron access covers, gully gratings and kerbside drainage solutions Ductile iron water and sewer pipes, fittings, valves, couplings and adaptors

    Treatment Works Products/Services
    Networks - Sewerage
    Glanua Group logo

    Glanua Group

    United Kingdom

    Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build and operate critical water and wastewater infrastructure across Ireland and the UK. Glanua is passionate about solving today’s environmental challenges and delivering a decarbonised and sustainable world. At Glanua, we design, build, operate, and maintain innovative water and wastewater solutions that protect the environment and support the people who depend on them. Sustainability is at our core — it’s why we innovate, how we work and the future we’re building. We’re reimagining how the world treats water, using cutting-edge technology, smart design and fresh thinking to deliver cleaner, greener results for both industry and the public sector. With global ambitions and a track record of turning ideas into reality, we’re on an exciting journey of growth and impact. Glanua are a partner to major water utilities in Ireland and the UK, including Uisce Éireann (formally Irish Water), Thames Water, Yorkshire Water, Affinity Water and Northern Ireland Water. In the industrial sector, their clients include prominent names such as ABP, Glanbia, Kerry Group, and other key players in the food and beverage, pharmaceutical, and distillery industries. Core Values Glanua lives by our core values, including Safety and Well-being, Innovation, Integrity, Collaboration, Courage, Agility, Accountability, Diversity, and Inclusion. These values guide our actions and decisions, ensuring that we uphold the highest standards in everything we do. Our talented team comprises over 500 professionals across Ireland and the UK. Our UK office is headquartered in Hertfordshire and we also have offices in Reading, Sheffield, Northern Ireland, Galway and a manufacturing facility in Navan, Co Meath. Sustainability At Glanua, we understand the vital role we play in ensuring the delivery of safe and high-quality drinking water, as well as the proper treatment of wastewater before it is discharged into the environment. Committed to building today without compromising the environment for future generations, sustainability lies at the core of what we do. To strengthen our commitment, we have partnered with Earthshine, a leading sustainability consultant to develop our sustainability strategy that aligns with our values and ensures that every engineering solution we deliver contributes to a greener and more sustainable world. Future growth Glanua is on a growth trajectory, with ambitious plans to reach €400 million in the next five years. As we continue to expand our capabilities and service offerings, we remain committed to being at the forefront of sustainable engineering solutions, driving positive change in the water and wastewater infrastructure landscape in Ireland, UK, and internationally. Our growth is evident in the recent expansion of our team by over 150 people in 2023, bringing our total workforce to over 500 people. In 2024, we acquired O&M specialist company, Aqua Operations and in 2025, we acquired Anaerobic Digestion specialist company, Marches Biogas building a complete solutions provider in Water, Wastewater and Bioresources.

    Networks - Water Supply
    Contractors
    Waterco logo

    Waterco

    United Kingdom

    Waterco are engineering and environmental consultants providing design and consultancy services relating to water, drainage and flood risk. We have expertise in engineering and environmental disciplines and are supplemented by a network of specialist independent consultants with extensive experience in major development projects throughout the UK. Our focus is on achieving the optimum solution for our clients, meeting their objectives and adding value to their projects. We have gained a reputation for a friendly, professional and flexible approach since our establishment in 1990. Our Services Water industry infrastructure and non-infrastructure projects Pipelines & Sewerage Water & Wastewater Treatment & Systems Pumping Stations Contingency Planning Security Assessments Asset Management Surge Analysis Hydraulic Modelling Flood Risk Assessment Breach Analysis Coastal & Shoreline Analysis Surface Water Management Sustainable Drainage Systems Natural Flood Management/Catchment Approaches Clients and Partners Our clients and partners include water companies, consultants and contractors. Incorporating their experience and knowledge, we investigate and develop practical designs, to help deliver cost-effective solutions. Geographic Coverage We undertake projects all across the UK, with many of our reporting services being desk-based, travelling to site visits and meetings as required. We have also been involved in international projects such as a major development in Lekki, Nigeria. Accreditations We currently have an ISO 9001 : 2015 accredited Quality Management System; have a BS8555 : 2003 certified Environmental Management System; have design approval in the Water Industry Registration Scheme (WIRS); have maintained Investors in People recognition since 2011 and operate an ICE approved training scheme.

    Designers
    Electrosteel Castings (UK) Ltd logo

    Electrosteel Castings (UK) Ltd

    United Kingdom

    Electrosteel Castings (UK) Ltd is a leading manufacturer of ductile iron pipes, fittings and ancillary pipeline products, supplying companies all around the globe. Our products fully comply with the many international and European standards for conveyance of potable drinking water, raw water and wastewater. We pride ourselves on providing a tailor-made solution that will meet your requirements, whatever the size or nature of your project. Working closely with the rest of the Electrosteel family, Electrosteel UK have the ability to manufacture, source, and consolidate product packages enabling our customers to have a single point of responsibility for the management and delivery of the materials ordered. This in turn ensures effective, on-time project completion and peace of mind. Electrosteel Castings (UK) is part of a company that has been engaged in the water infrastructure business for over fifty years. We cater to a large customer base in the UK, the Indian subcontinent, Southeast Asia, the Middle East, Europe, Africa, and the USA. We have fulfilled more than 10,000 water supply projects in which our ductile iron spun pipes and fittings were implemented. In the UK we produce pipes and fittings in the range DN80mm – DN1000m in accordance with the following European standards: EN 545 for water EN 598 for sewerage

    Treatment Works Products/Services
    Networks - Sewerage
    Amiblu UK LTD logo

    Amiblu UK LTD

    United Kingdom

    If you knew there was a material out there with a proven track record worldwide for outperforming others, would you want to know more about it? Using cutting edge technology to meet the toughest challenges, Amiblu manufactures GRP pipelines and storage systems that last for generations and do not corrode. GRP is a resilient, composite material utilised in many aspects of construction and civil engineering to deliver long lasting infrastructure. The history of Amiblu’s GRP systems starts with the first production of centrifugal cast (CC) pipes in Basel in 1957 and continuous filament wound (FW) pipes in 1969 in Norway using top quality raw materials combined with glass fibres to create robust pipes and storage solutions. Over the past 60+ years, research and development, growth and investment now puts Amiblu at the forefront of GRP pipe production, with seven state of the art manufacturing facilities and a global network of licensed partners producing the two market leading names in GRP pipes – Flowtite (FW) and Hobas (CC). Amiblu takes environmental responsibility very seriously by developing systems that offer a number of benefits to asset owners who are faced with aging networks, growing cities, climate change and increases in demand. Challenging traditional materials, our products are corrosion and abrasion resistant, with excellent hydraulics, can be bespoke made to meet project requirements, are low-maintenance and engineered for 150 years’ service life. Products are manufactured for: Sewage & stormwater Hydropower Circular & non-circular pipeline rehabilitation Potable & raw water delivery Industrial processes Micro-tunnelling applications. The greenest product is the one you don’t have to replace.

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    Fluor Corporation logo

    Fluor Corporation

    Netherlandsenterprise
    apac · north-america

    Fluor Corporation is one of the largest construction and engineering companies in the world. Fluor provides engineering, procurement, construction, and project management for complex projects in the energy, chemicals, and infrastructure sectors.

    information-technology
    metals
    Glenfield Invicta Ltd logo

    Glenfield Invicta Ltd

    United Kingdom

    From concept to completion, Glenfield Invicta’s end-to-end Project Solutions provide market leading valve and penstock engineering excellence, across a multitude of water utility and non-water utility infrastructure projects. The company combines the strength and unique proposition of Invicta’s site solutions, penstocks, and environmental expertise, with Glenfield’s experience and expertise in specifying and managing large Dams, Reservoirs and Hydropower projects. Supported by the vast product portfolio from the AVK Group of manufacturing companies. We are market leaders distinguished by our industry expertise, we have been designing and manufacturing specialist engineered valves and penstocks for more than 170 years. We stand behind every product we install for life, offering some of the best extended warranties in the industry. Our experienced and multi-skilled project team work closely with our partners and key stakeholders to ensure your project is executed to exacting standards. Our long history in designing, supplying, and installing highly engineered valves and pipeline equipment in projects is what sets us apart. Our projects are delivered safely, on time, and to the highest standards in arduous applications. This specialist capability has made the our brands synonymous with engineering excellence worldwide. We have recently invested over £2m in our Kilmarnock facility which extends to over 200,000 sq. ft. of manufacturing, office, warehousing, and education space. It includes a new purpose-built Learning Academy; which will include an interactive visitor centre. We are committed to training the apprentices and engineers of the future.

    Project Planning & Surveying
    Designers
    Greenbank Group logo

    Greenbank Group

    United Kingdom

    A specialist engineering company with a global customer base. Greenbank provides a wide range of products and services to companies operating across a number of industries and is now establishing itself in the clean and wastewater sector. For many years the company has utilised the unique properties of volcanic basalt for lining products used in heavy industries such as power generation and minerals extraction. In partnership with Czech firm Eutit, the company has also been pioneering the use of basalt in the renovation and restoration of sewer systems in central European following a series of successful projects in Prague. As a result of devastating floods, the city’s sewer system was extensively rebuilt and upgraded with basalt being used in a number of key locations to provide a new level of security to the system. More than a decade on, the new system continues to perform well and has set a standard that’s now been followed in other European cities. Well suited for the most demanding of applications, thanks to the partnership between Greenbank and Eutit, a wide range of basalt solutions are now available in the UK market. These include products and systems that bring a wide range of benefits to the industry, including: Basalt tiles that can also be used to line existing brickwork, a more cost-effective solution than full replacement, and their reduced drag co-efficient means improved flow – in effect a smaller-diameter pipe or tunnel lined with basalt can carry a higher volume of water than a larger one with traditional brick surfaces. The effective life expectancy of basalt-lined sewer systems is between 100 and 200 years, thanks to their excellent resistance to abrasion and chemical damage – as well as the rigours of high-pressure water jetting that’s often used to clear unwanted blockages. For larger round or ovoid systems, basalt can be used in the lower sections to deal with the wear and tear with concrete upper sections to provide optimum life performance. Alternatively, steel pipes lined with basalt can be produced up to 3000mm diameter producing a lighter therefore lower cost installation option to thick wall concrete. Ease of installation and reduced maintenance costs make basalt ideal for bottom gutters, branch pipes and tubes and slip-resistant elements for walkways, and Greenbank can also supply bespoke-shaped tiles to meet the unique requirements of individual clients. With manufacturing facilities in Derbyshire and Nottinghamshire, supported by the additional capacity and expertise provided by the latest addition to the group, Franklyn Yates Engineering, Greenbank is well placed to react quickly and efficiently to the needs of new and existing clients.

    Hydro International logo

    Hydro International

    United Kingdom

    Hydro International, a CRH company,  provides advanced products, services and expertise to help municipal, industrial and construction customers to improve their water management processes, increase operational performance and reduce environmental impact. Hydro International can help water companies meet their AMP and environmental obligations, including the reduction of sewer overflows and the Water Industry National Environment Programme (WINEP). Hydro International provides total solutions for Inlet Works, Combined Sewer Overflows (CSOs), Stormwater Management, Flood Warning and Prevention, and Water Resource management, from design to supply and installation through to ongoing preventative maintenance, servicing and emergency repair.  These solutions include: Hydrometric data collection, monitoring analysis and reporting for river level, reservoir, network and weather. Continuous water quality monitoring for compliance with Section 82 of the Environment Act. Water resource analysis and consultancy. Stormwater management solutions, including options for Sustainable Drainage Systems. (SuDS) and Smart Maintenance. CSO event duration monitoring. CSO and storm tank treatment and screening. Passive flow controls for flood prevention schemes, SuDS, CSOs and WwTWs. Inlet works screening and grit removal solutions. Sludge screening. Dropping sewage or water safely from height. Hire, repair and maintenance of inlet works screens and screenings handling equipment

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Metasphere Ltd logo

    Metasphere Ltd

    United Kingdom

    Metasphere helps customers prevent leaks and spills for a cleaner, greener world. As a wastewater application specialist business, we provide monitoring solutions to the global utility industry with over 40 000 installations in 25 major utilities. Metasphere liaises with all sectors of the industry, from major utility companies to environmental and regulatory bodies. Utilising the latest technology, we deliver intelligent, innovative all-in-one telemetry solutions that provide full network visibility, performance and forecasting that reduce telemetry ownership cost for customers to manage time-critical remote assets and systems. Our solutions are suited for Water, Wastewater, Environmental and Gas applications.

    Control & Automation
    Swissenviro GmbH logo

    Swissenviro GmbH

    Switzerland1-50 employees
    Europe · Middle East & Africa (MEA)

    Swissenviro GmbH specializes in organizing Swiss Pavilions at international trade fairs, promoting Swiss environmental technologies across the globe. They provide a platform for Swiss companies to showcase their innovations in waste management, water treatment, and green energy solutions.

    Waste Management and Remediation
    Utilities
    Stonbury logo

    Stonbury

    United Kingdom

    Stonbury is an agile, direct delivery specialist contractor to both the water industry and wider water environment, with an emphasis on delivering innovative, low carbon and high-quality reliable solutions. Currently holding over 30 Frameworks, we work with most of the UK’s water companies and the EA – either directly or through their major supply chains – to deliver high value, low carbon solutions across their asset estates. This includes works on potable water, wastewater treatment centres and nature-based ‘green’ and ‘grey’ solutions that deliver smart, low carbon environmental engineering. In recognition of the intensified global focus on the effects of carbon emissions and their impact on the climate and biodiversity we have reassessed our Purpose, Vision and Strategic Goals, putting sustainability at the heart of our culture and everything we do.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
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    SuDS and Green Infrastructure: Blue-Green Design, WSUD, and Urban Water Management

    Green infrastructure and sustainable urban drainage systems (SuDS) integrate ecological, hydrological, and urban design principles to manage stormwater and surface water in urban environments while delivering multiple co-benefits (biodiversity, urban cooling, air quality, wellbeing). Blue-green infrastructure typologies: green roofs (extensive: substrate 60 to 200 mm, sedum/wildflower, weight 60 to 150 kg/m2 saturated; intensive: substrate 200 mm to 1,000 mm, planted trees and shrubs, weight 200 to 500 kg/m2; FLL Guidelines (German Green Roof Association) and BS 8495 specification); rain gardens (shallow depressions planted with flood-tolerant species: Persicaria bistorta, Lythrum salicaria, Geranium sanguineum; infiltration-based or lined with outlet; ponding depth 100 to 300 mm for 4 to 24 hours storm storage); bioretention cells (engineered soil profile: 50 mm mulch layer, 400 to 600 mm bioretention media (sandy loam, 20 to 30 percent fines, k = 10-4 to 10-5 m/s), optional underdrain; phosphorus removal by adsorption in media; nitrogen removal by denitrification; heavy metal removal 60 to 90 percent); swales (vegetated channels; flow velocity less than 0.5 m/s for 1-in-10-year event; Manning's n = 0.02 to 0.04 for well-maintained grass; minimum 0.5 percent slope to prevent ponding; typically 600 mm to 1,200 mm wide; overflow structures at regular intervals).

    Water sensitive urban design (WSUD) as a systems approach: WSUD integrates water supply, wastewater, and stormwater management into urban planning at master plan stage; originating in Australian practice (Melbourne Water WSUD guidelines, 2005) and adopted widely in UK (CIRIA C753 SuDS Manual, 2015; Newcastle Blue-Green Cities project; Glasgow Urban Big Water project; Sheffield Blue-Green Infrastructure programme funded by EPSRC). WSUD principles: minimise impervious surfaces (target impervious fraction less than 30 percent for new development in water-sensitive design); maximise infiltration (permeable paving for low-traffic areas: CIRIA C754; concrete block permeable paving: BS EN 1338; porosity 15 to 25 percent; hydraulic conductivity greater than 100 mm/h); harvesting and reuse of stormwater and greywater for non-potable uses (toilet flushing, irrigation, cooling towers; savings 30 to 50 percent of mains water demand). Urban heat island mitigation: green roofs reduce peak surface temperature by 10 to 30 degrees C compared to conventional rooftops; urban trees provide evapotranspiration cooling (single mature tree transpires 200 to 400 L/day in summer; cooling effect equivalent to 5 to 10 air conditioning units); blue spaces (ponds, streams, fountains) provide 1 to 3 degrees C local air temperature reduction. Biodiversity Net Gain (BNG): mandatory for new developments over 10 dwellings (under Environment Act 2021, commencement April 2024) requiring 10 percent BNG; SuDS and green infrastructure contribute to habitat creation units (HU) under the Defra BNG metric (version 4.0).

    Planning policy and green infrastructure standards: National Planning Policy Framework (NPPF) Paragraph 96 requires LPAs to apply policies to protect and enhance biodiversity and green infrastructure; LDP Green Infrastructure policies require GI provision for major developments; Bristol, Manchester, Leeds, and London have adopted city-wide Green Infrastructure Frameworks. London Plan Policy G5 (Urban Greening Factor, UGF) requires all major developments to achieve a target UGF score (residential: 0.4; commercial: 0.3) using weighted scoring for different types of green surface (green roof: 0.7; bioretention: 0.7; grass: 0.3; trees: 2.0 multiplier based on canopy coverage); UGF assessment submitted with planning application. Trees and tree root zones: BS 8545 (trees: from nursery to independence in the landscape); NJUG Volume 4 (utility installation near trees); BS 5837:2012 (trees in relation to design, demolition, and construction); TEMPO model (Trees and Design Action Group, TDAG) for urban tree benefits assessment; root protection area (RPA) calculation: 12 x stem diameter for standard calculation. Maintenance and adoption: SuDS green infrastructure requires specialist long-term maintenance (vegetation management, sediment removal, outlet inspection); LLFA and sewerage undertaker adoption criteria specify maintenance schedule in adoption agreement; management companies (Greenbelt, Idverde, Ground Control) specialize in SuDS maintenance contracts.

    Post your suds & green infrastructure project — get matched proposals

    Frequently Asked Questions

    What is the Biodiversity Net Gain requirement and how does green infrastructure contribute?

    Biodiversity Net Gain (BNG) became mandatory for all new major developments in England from April 2024 under the Environment Act 2021, requiring developers to demonstrate a 10 percent net gain in biodiversity units above the pre-development baseline. BNG is calculated using the Defra Statutory Biodiversity Metric (version 4.0, 2023): pre-development habitat units (HU) quantified by habitat type (e.g. species-rich grassland, woodland, urban), area, and condition; post-development habitat units calculated using same methodology including retained and newly created habitats; net change must be at least +10 percent. Green infrastructure contributions to BNG: wildflower green roofs (BBSF score: 0.3 to 0.5 HU/100 m2 depending on sedum vs wildflower mix); bioretention rain gardens with native planting (0.4 to 0.6 HU/100 m2); wetland SuDS ponds (0.8 to 2.0 HU per pond depending on size and habitat quality); habitat corridors (swales planted with native marginals: 0.3 to 0.5 HU/100 m linear); urban trees (counted separately under canopy cover metric; BS 5837:2012 retention plan). BNG process: pre-application biodiversity baseline survey (Phase 1 Habitat Survey by ecologist, NVC for grasslands); Biodiversity Metric 4.0 calculation submitted with planning application; BNG plan stating how 10 percent gain achieved on-site, off-site, or via statutory biodiversity credits (purchased from EA at GBP 42,000 to GBP 650,000 per credit depending on habitat type); LPA conditions require 30-year maintenance and monitoring plan; legal agreement (planning obligation or BNG agreement under Section 106 Town and Country Planning Act 1990) secures long-term management.

    What is a green roof and what types are available?

    Green roofs are vegetated roof systems installed on building rooftops, comprising a waterproof membrane, drainage layer, growing substrate, and vegetation. Types: (1) Extensive green roof: thin substrate 60 to 200 mm (typically 80 to 120 mm); lightweight 60 to 150 kg/m2 saturated; low-maintenance drought-tolerant vegetation (sedum species: S. acre, S. album, S. spurium; wildflower mixes for BNG); minimal or no irrigation after establishment; installed on roofs with 1 to 25 percent pitch; cost GBP 50 to 150/m2 supply and install. (2) Intensive green roof: substrate 200 mm to 1,000 mm; heavyweight 200 to 500 kg/m2 saturated; supports trees, shrubs, and perennials; requires irrigation system and regular maintenance (mowing, pruning); structural roof assessment required; cost GBP 150 to 500/m2. (3) Semi-intensive green roof: intermediate 100 to 250 mm substrate; mix of sedum, grasses, and perennials; moderate maintenance; cost GBP 80 to 200/m2. (4) Biodiverse/brown roof: substrate mix includes crushed aggregate, sand, and low-fertility subsoil; designed for invertebrate and bird habitat rather than visual appearance; mandated by London Plan for flat roofs on major developments. Performance: stormwater retention (extensive: 10 to 50 mm/event depending on substrate depth and antecedent moisture; intensive: 50 to 100 mm/event); thermal insulation (U-value improvement 0.1 to 0.2 W/m2K); urban heat island reduction (surface temperature 10 to 30 degrees C lower than conventional roof in summer). Standards: FLL Guideline for the Planning, Performance, and Maintenance of Green Roofing (Germany, adopted as UK reference standard); BS 8495:2007 (Code of practice for installation of drainage in green roof systems); WRAP Green Roof Toolkit.

    What planning policies require green infrastructure in UK developments?

    UK planning policies requiring green infrastructure: (1) NPPF (National Planning Policy Framework) England: Paragraph 96 requires LPAs to apply policies to protect and enhance green infrastructure; Paragraph 136 requires ecological networks are maintained and enhanced; BNG mandatory from April 2024 (Environment Act 2021, Schedule 7A). (2) London Plan (2021): Policy G5 (Urban Greening Factor, UGF): major residential development must achieve UGF 0.4, major commercial development UGF 0.3; calculated using GLA UGF calculator; Policy G6 (Biodiversity and Access to Nature): major developments in deficiency areas must deliver accessible nature. (3) Wales: Future Wales National Plan; Planning Policy Wales (PPW) Edition 12 (2024): Section 6.4 requires LPAs to protect and enhance green infrastructure; Well-being of Future Generations (Wales) Act 2015 places sustainability duty on all public bodies including LPAs; TAN 15 (Technical Advice Note) on development and flood risk. (4) Scotland: Scottish Planning Policy (SPP) 2014: green infrastructure promoted for climate change adaptation; Biodiversity Net Gain included in NPF4 (National Planning Framework 4, 2023). (5) Specific LPA policies: Greater Manchester Green Infrastructure Standards (GMCA, 2023); Leeds City Region Green Infrastructure; Bristol City Council Urban Living SPD requiring 30 percent green coverage on rooftops. (6) Environment Act 2021 provisions: mandatory BNG; Local Nature Recovery Strategies (LNRS) to guide GI placement; Species Conservation Strategies (SCS). Developers must submit Green Infrastructure Plan or Landscape and Ecological Management Plan (LEMP) with planning applications for major sites.

    What maintenance do SuDS and green infrastructure features require?

    SuDS and green infrastructure maintenance requirements: Green roofs: extensive roofs: twice-yearly inspection (spring and autumn); weed removal (particularly invasive species, tree seedlings); clearing of drains and outlets; dead vegetation clearance after winter; occasional reseeding of bare patches; annual cost GBP 1 to 5/m2. Intensive roofs: monthly inspection; irrigation management; seasonal planting; structural maintenance; annual cost GBP 10 to 30/m2. Bioretention and rain gardens: annual inspection of soil permeability (falling head test; target k greater than 10 mm/h; replace or scarify if clogged); vegetation management (2 to 4 cuts per year; removal of non-native invasives; replanting gaps); sediment removal from surface (when sediment depth reaches 50 mm; typically every 2 to 5 years depending on catchment); outlet inspection; annual cost GBP 2 to 8/m2. Swales: grass cutting 4 to 6 times per year; weed control; sediment check dam inspection; outlet inspection after storm events; annual cost GBP 1 to 3 per linear metre. Detention basins and ponds: annual inspection of outlet structure; bathymetric survey every 5 to 10 years (when sediment reduces storage volume by 20 percent, dredge); vegetation management (marginal plants cut annually; invasive species removal); litter clearance; annual cost GBP 0.50 to 2.00/m2 water surface. Contractual arrangements: specialist SuDS maintenance contracts through Idverde, Greenbelt, Ground Control, Nurture Landscapes; maintenance schedule specified in LLFA adoption agreement or Section 106 agreement; estate management company (EMC) typically holds maintenance obligation for privately adopted SuDS on residential developments. Regulatory: EA may require inspection records for adopted SuDS; annual maintenance report submitted to LLFA in some authorities.

    Case Study·Mixed-use urban regeneration
    Challenge

    A 4.8-hectare brownfield regeneration scheme in Manchester included 650 dwellings and 2,000 m2 of commercial space. The site was in a confirmed surface water flood risk area with a 1-in-10-year flooding history. The local planning authority required a 12-point Urban Greening Factor score and 15 percent Biodiversity Net Gain, in addition to SuDS greenfield runoff equivalence.

    Approach

    Green and blue infrastructure was integrated at master plan stage: extensive sedum green roofs on all commercial units (1,800 m2, FLL-specification, 120 mm substrate); rain gardens along the main pedestrian boulevard (bioretention cells with iron-amended media and native Persicaria and Lythrum planting); three interconnected amenity ponds (combined 900 m2 water surface; permanent pool 1.0 m; 1.4 m flood storage; planting zones 1 to 4); and permeable block paving on shared surfaces. UGF scored at 0.44 for residential plots.

    Outcome

    The SuDS scheme achieved greenfield runoff of 3.7 L/s/ha (target 5 L/s/ha) and the amenity ponds received formal LLFA adoption under a 100-year Section 106 maintenance plan. BNG was demonstrated at 18 percent net gain using Defra Metric 4.0. The green roofs contributed 2,200 m2 of priority urban habitat. Post-completion insurance claims from surface water flooding fell to zero in the first three years versus the site's previous 1-in-3-year claim frequency.

    Questions to Ask Shortlisted Providers

    1. 1

      How is the Urban Greening Factor (UGF) calculated for this site and which London Plan or local policy applies?

      UGF scoring is specific to London Plan Policy G5 and its GLA calculator; outside London, some LPAs have adopted equivalent but differently weighted local policies that require a different scoring methodology.

    2. 2

      What is the long-term management plan for green roof vegetation and who carries liability if the sedum cover fails within the first 5 years?

      Sedum green roofs suffer establishment failure on poorly irrigated substrates in dry summers; without a contractual establishment period and liability for re-planting, the developer may inherit a bare roof that fails the BNG condition.

    3. 3

      How does the bioretention media specification account for our site's clay-dominated catchment contributing fine sediment?

      Standard sandy loam bioretention media clogs rapidly with clay-loaded stormwater; iron-oxide amendment and a sacrificial sediment pre-treatment layer are needed, adding 20 to 35 percent to media cost.

    4. 4

      What is the 30-year habitat management plan required under the Environment Act 2021 BNG obligations and who will be the responsible body?

      BNG requires a legally secured 30-year habitat management and monitoring plan; estate management companies typically lack the ecological expertise to discharge this obligation without a specialist sub-contract.

    5. 5

      How have you assessed the interaction between the pond's permanent pool and groundwater in this brownfield setting, including any contamination risk to shallow groundwater?

      Brownfield sites may have contaminated shallow soils; an unsealed pond base could allow contaminated groundwater to migrate into the pond water, creating an ecological risk and a potential EA-controlled waters enforcement issue.

    What Drives Cost in This Category

    Green roof substrate depth and structural loading

    An extensive roof (80 mm substrate, 100 kg/m2 saturated) can be retro-fitted to most commercial structures with minor upstand reinforcement; an intensive roof (300 mm substrate, 400 kg/m2) requires structural roof design from inception and can add GBP 200 to 400/m2 in structural steel cost alone.

    BNG habitat type and multiplier

    Designing ponds as high distinctiveness wetland habitat (scoring 6 to 8 on the Defra Metric) rather than low distinctiveness amenity grassland (scoring 2 to 3) can reduce the area of habitat creation needed to achieve 10 percent BNG by 50 to 70 percent, saving significant land area at typical urban land values.

    Long-term management contract term and ecological expertise

    A 30-year habitat management contract covering green roofs, bioretention, and ponds costs GBP 8,000 to 25,000 per year; capitalised NPV at 3.5 percent over 30 years is GBP 165,000 to 510,000, which should be reflected in a long-term maintenance reserve in the estate management company's service charge.

    Brownfield contamination management

    If SuDS features overlie contaminated ground, an impermeable liner (HDPE 0.5 to 1.0 mm) must be installed beneath all infiltration features to prevent contaminated water contact with groundwater; liner supply and installation for a 900 m2 pond adds GBP 18,000 to 35,000 and triggers EA Section 78 assessment obligations.

    Key Regulations & Standards

    London Plan Policy G5 Urban Greening Factor

    All major residential developments in Greater London must achieve a minimum Urban Greening Factor of 0.4 and all major commercial developments 0.3, calculated using the GLA's UGF calculator; green roofs, bioretention, and trees carry the highest UGF weightings (0.7 and above).

    Environment Act 2021 - 10 Percent BNG

    Mandatory for all new major developments in England from April 2024; Biodiversity Net Gain must be calculated using Defra Statutory Biodiversity Metric 4.0; a 30-year habitat management and monitoring plan must be legally secured through a planning obligation (Section 106 or conservation covenant) before planning permission is granted.

    Town and Country Planning (EIA) Regulations 2017

    Urban regeneration schemes above 1 hectare in a sensitive area or 5 hectares elsewhere may require Environmental Impact Assessment including an ecological baseline survey, Habitats Regulations Assessment (if within 5 km of a SAC or SSSI), and a green infrastructure impact assessment.

    BS 8495:2007 and FLL Guidelines for Green Roofs

    Green roofs must be installed to BS 8495:2007 (Code of practice for installation of drainage in green roof systems) and the FLL Guideline for the Planning, Performance, and Maintenance of Green Roofing (German standard adopted as UK reference); structural loading calculations must be verified by a chartered structural engineer against BS EN 1991-1-1.

    Explore Related Categories

    Green Infrastructure

    Green Roof CompaniesPermeable Paving CompaniesStormwater Management Companies

    Treatment

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    Browse the full provider directory

    Comparing suds & green infrastructure companies is one slice of a larger shortlisting decision. Explore the complete directory of water treatment suppliers, then filter by region, sector, and technology before you request scoped proposals.

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