Aquacell crates close up

No roundabout way about it: Wavin’s Q-Bic plus ticks all the boxes for Norfolk County Council

Developing a new four-arm roundabout to open up new land for development, Norfolk County Council (NCC) didn’t have the option of feeding the rainwater runoff into the existing local sewer system. The council therefore needed a water attenuation system that would be simple to install and easy to maintain. Requiring a system that would meet various stringent specifications, the council and project contractor, Tarmac, worked with water management experts Wavin to develop a bespoke solution.

Developing a new four-arm roundabout to open up new land for development, Norfolk County Council (NCC) didn’t have the option of feeding the rainwater runoff into the existing local sewer system. The council therefore needed a water attenuation system that would be simple to install and easy to maintain. Requiring a system that would meet various stringent specifications, the council and project contractor, Tarmac, worked with water management experts Wavin to develop a bespoke solution.

Tackling the Problem Straight On

Before breaking ground on the project in Mundford, Thetford, NCC needed to ensure it would adhere to various regulatory requirements from both the Lead Local Flood Authority (LLFA) and the Environmental Agency (EA).

The LLFA stated that any proposed system for the new roundabout would need to be designed to cope with a 1 in 100-year storm event, while also offering an additional 40% allowance for climate change. This meant a large amount of storage would be needed in the small space, calling for an advanced stormwater system. The site is also within an EA Source Protection Zone 3, requiring the proposed drainage system be fully inspectable.

To meet these requirements, NCC engineer Ting Liu designed a water attenuation system featuring Q-Bic Plus. Once developed, Liu called upon the services of Wavin’s technical team to check and confirm the designs. The team confirmed that Q-Bic Plus would be an ideal effective option to provide an inspectable and flexible solution for the compact site.

Liu, Engineer for NCC’s Community and Environmental Services, explains: “There are many storm water attenuation systems on the market, but not many can be inspected. We opted to use Wavin’s Q-Bic Plus system due to its storage and infiltration capabilities, alongside its easy accessibility for inspection. We were also impressed by the support Wavin’s Technical Team provided in confirming our designs and product selection were best for Mundford.”

Easy Maintenance and Flexibility

Due to its high storage volume and 70% open floor space, Q-Bic Plus provides lateral and vertical access for easy access for inspection and cleaning equipment. The product also offers significantly enhanced design freedom, speedy installation and seamless access for inspection, cleaning and maintenance. These features made it the perfect fit for the project.

Once the designs were finalised, Wavin worked closely with Tarmac to ensure the project ran smoothly. The Tarmac site team hadn’t worked with the product previously, so Wavin provided on-site training on the simple installation process for all team members.

A Fork in the Road

Upon breaking ground, Tarmac’s team found existing utility infrastructure below the old roadway that couldn’t be removed. These utility lines ran perpendicularly to the initial Q-Bic Plus designs. Fortunately, the flexibility of the product meant that Wavin’s technical team could easily adjust the design – rotating it to run parallel instead – allowing work to continue to original timescales.

Sean Rasberry, Gang Foreman on site for Tarmac, said: “When we initially received the delivery of Wavin’s Q-Bic Plus on site we were a little apprehensive. It was a big delivery and not something we’ve worked with before, but the flexibility and ease of installation of the product was great. We’ve even managed to save a few days on the installation process to get the project finished ahead of schedule.”

On the Road to Success

Installation of the Q-Bic Plus crates finished in late November, with the full project expected to be completed and handed to NCC ahead of Christmas.

Martin Lambley, Wavin Product Manager for Stormwater Management, said: “Our technical and product teams worked together to provide the perfect solution to meet Norfolk County Council’s requirements and sit within the stipulations from the LLFA and EA.

In addition, Q-Bic Plus offers enhanced modularity compared with standard engineered SuDS, providing engineers with even greater freedom to design a system that meets the unique needs of each site. It also significantly streamlines the installation process, as sections of the system can be moved and fixed into place by hand. 

To further support the SuDS system in removing excess water during heavy rain, Wavin’s OsmaDrain pipe systems have been installed across the site. These connect the Q-Bic Plus tanks with the rest of the guttering and drainage network in the development in order to channel rainwater from roofs, footpaths and the car park into the SuDS, managing surface water levels in the development. 

Martin Lambley, Product Manager for Stormwater Management at Wavin, commented: "Simplifying the monitoring and care of SuDS is key to making sure they offer the same great performance over the long term as they did the day they were installed."

Our technical and product teams worked together to provide the perfect solution to meet Norfolk County Council’s requirements and sit within the stipulations from the LLFA and EA.
Martin Lambley , Wavin Product Manager for Stormwater Management

Martin went on to say, “This project is a key example of the flexibility of Q-Bic Plus and the design and technical support we offer as a business. There’s more to Wavin than just product and we’re delighted we were able to assist the council and Tarmac in being able to deliver this project ahead of deadline.”

Wavin boasts over 25-years’ expertise and innovation in infiltration and attenuation technology.

For more information on Wavin’s Q-Bic Plus solutions, click here.