In Dutypoint’s Sustainable Urban Drainage Systems (SuDS) Series so far, we’ve explored why engineered solutions are essential for modern drainage, how pumped systems overcome gravity limitations, how offsite-built packaged plant rooms speed up delivery and how attenuation tanks provide compliant stormwater storage. In Part 5, we turn our attention to rainwater harvesting, a SuDS technique that not only manages runoff but also transforms it into a valuable on-site resource.
With the right integration of filtration, storage, and cold water booster sets, rainwater harvesting can cut mains demand, lower operational costs, and help developments hit key sustainability targets, all while strengthening flood resilience.
What is rainwater harvesting in SuDS?
A recognised SuDS technique, rainwater harvesting serves a dual purpose: it supports drainage compliance while contributing to sustainability targets like BREEAM and ESG frameworks. By reusing captured runoff for non-potable applications, it reduces mains water demand and turns compliance infrastructure into a long-term operational benefit for developers and consultants focused on net-zero design.
Rainwater harvesting provides a vital opportunity for M&E specifiers to add value through integrated SuDS strategies amid growing regulatory and environmental pressures.
Benefits of Integrating Rainwater Harvesting in SuDS
- Reduces mains water consumption and utility costs: By reusing captured runoff for non-potable applications such as toilet flushing, irrigation, and car washing, a building’s reliance on mains water can be significantly lowered, reducing operational costs.
- Enhances flood mitigation: By capturing runoff at the source, these systems reduce the volume of water entering drainage networks during storms, thereby lowering flood risk.
- Supports SuDS compliance and sustainability targets: Integrating rainwater harvesting helps meet SuDS regulations and contributes to key sustainability targets such as BREEAM and ESG frameworks.
One of the most understated benefits of integrating rainwater harvesting strategies, however, is its potential to increase long-term asset value.
How Does Integrating Rainwater Harvesting Add Long-Term Value?
Beyond meeting today’s compliance requirements, rainwater harvesting can deliver significant lifecycle and commercial advantages for developers, asset owners, and occupiers. By integrating storage, filtration, and booster systems into a SuDS strategy, you can:
- Lower operational costs: Reduced reliance on mains water leads to ongoing savings on utility bills, particularly for large commercial or multi-residential buildings with high non-potable water demand.
- Increase asset marketability: Sustainable water reuse systems are attractive to investors, tenants, and buyers seeking green credentials and operational efficiency.
- Strengthen ESG and certification credentials: Contributes positively to BREEAM, LEED, and corporate ESG reporting, improving a building’s sustainability profile in measurable ways.
- Future-proof against tightening water regulations: Reduces dependency on mains water in anticipation of future supply restrictions, price rises, or legislative changes.
- Enhance site resilience: Provides a self-sufficient non-potable water source, ensuring continuity for essential functions during supply interruptions.
- Support long-term operational planning: Offers predictable resource availability, helping facilities teams plan maintenance and budgets with greater certainty.
By designing rainwater harvesting as an integrated SuDS component, the system’s value extends far beyond stormwater control, positioning the asset to perform, comply, and compete for years to come.
To turn these benefits into reality, specifiers must consider the essential components needed for a functional and reliable system.
What equipment is needed for rainwater reuse in SuDS?
Harvesting and recycling rainwater requires more than collection and storage. Rainwater tanks must be integrated with:
- Filtration systems to ensure quality and remove particulates or organic matter
- Booster sets to deliver consistent pressure across multi-storey buildings
- Smart control panels to automate switching between rainwater and mains water supply
- Backflow protection and compliance with BS 8515 for rainwater harvesting systems
Crucial to the success of a rainwater harvesting system, is a reliable coldwater booster system, capable of delivering pressurised water across multiple storeys. Further considerations when choosing a cold water booster set include, space constraints, variable demand, and integration with other building services, especially in urban or retrofit projects.
Dutypoint addresses these challenges head-on with its space-efficient, cold water booster pump sets, available as fully packaged solutions tailored for SuDS.
Which booster set is best for rainwater harvesting systems?
Dutypoint supplies a range of cold water booster sets suitable for rainwater harvesting in SuDS.
The ScubaTANK booster set and tanks system, for example, combines filtration, storage, backup mains integration, and reliable delivery in a compact, pre-tested system. It’s designed to slot easily into SuDS strategies, enabling rainwater reuse even in high-density or constrained developments.
Reducing Mains Demand in London with Rainwater Harvesting
The Fisheries, a six-storey mixed-use development in London Fields, required a sustainable rainwater harvesting system that captured roof runoff and reused it for toilet flushing.
Dutypoint provided a rainwater harvesting system as a pre-assembled package, including an underground tank, filtration, and ScubaTANK® system, which was installed during a tight mid-build window with minimal disruption. Subsequently, this system significantly reduced mains water use across 31 apartments and over 25,000 sq. ft of commercial space.
Turn Compliance into Long-Term Value with Dutypoint
Rainwater harvesting is more than a compliance checkbox, it’s an opportunity to turn SuDS infrastructure into an asset that delivers lasting operational savings, supports sustainability targets, and enhances flood resilience. By pairing high-quality storage and filtration with reliable cold water booster sets, such as Dutypoint’s compact, fully packaged ScubaTANK® system, developments can reuse captured rainwater efficiently, even in high-density or retrofit projects. This means lower mains water use, improved sustainability credentials, and a SuDS strategy that continues to go over and above standard compliance requirements.
In Part 6 of Dutypoint’s SuDS Series, we’ll explore smart controls and monitoring, how they keep SuDS systems reliable, maintainable, and compliant over the long term.
Ready to make rainwater harvesting part of your next project’s SuDS strategy? Speak to Dutypoint’s technical team today for tailored, space-saving solutions designed for maximum performance and compliance.
Captured Rainwater Harvesting: Frequently Asked Questions
By capturing and reusing stormwater on-site, these systems reduce the volume of water entering public drainage networks, directly contributing to flood mitigation and compliance with SuDS regulations.
A functional system requires a tank for storage, a filtration system to maintain water quality, and a reliable cold water booster set to deliver pressurised water for non-potable applications.
Absolutely. By supplying non-potable water for uses like toilet flushing and irrigation, rainwater harvesting reduces mains demand and can deliver substantial long-term cost savings.
Our systems are designed with smart controls that allow for integration with a building’s existing BMS, enabling remote monitoring and optimising performance for maximum efficiency.
