Water & Wastewater Treatment

WWT April 19

Water & Wastewater Treatment Magazine

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Developing a new four-arm roundabout to open up land for development, Norfolk County Council (NCC) needed a water attenuation solution that would be simple to install, easy to maintain and which would adhere to regulatory requirements from the Lead Local Flood Authority (LLFA) and the Environment Agency (EA). The LLFA stated that any proposed system 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. The site is also within an EA Source Protection Zone 3, requiring the proposed drainage system to be fully inspectable. To meet these requirements, NCC engineer Ting Liu designed a water attenuation system featuring Q-Bic Plus and explains why: "There are many attenuation systems on the market, but not many can be inspected. We opted for Q-Bic Plus due to its storage capabilities, alongside its easy accessibility for inspection. We were also impressed by the support from Wavin's Technical Team to confirm our designs were best for the project." Ticking all the boxes Due to its 96% void ratio and 70% open floor space, Q-Bic Plus provides lateral and vertical access for easy inspection, cleaning and maintenance. The product also offers true modular design freedom, speedy installation with no requirement for tools or clips, is fully SFA8 compliant and is BBA approved for trafficked and non- trafficked applications. With designs finalised, Wavin worked closely with Tarmac to ensure the project ran smoothly. As the Tarmac site team hadn't previously worked with the product, Wavin provided on-site training. A fork in the road On breaking ground, Tarmac's team found existing utility infrastructure below the old roadway that couldn't be removed. These utility lines ran perpendicular to the initial Q-Bic Plus designs. Fortunately, the flexibility of the product meant that Wavin's technical team could adjust the design – rotating it to run parallel – allowing work to continue on schedule. Martin Lambley, Wavin Product Manager for Stormwater Management said: "This project is a perfect example of the flexibility of Q-Bic Plus and the design and technical support we offer as a business. We are delighted we were able to assist the Council and Tarmac in delivering the project ahead of deadline." " It was really quick and easy to put together. You can turn the system without affecting anything and adjust everything to suit what we found on site. I would definitely recommend Q-Bic Plus. We actually gained a little bit of time on site and everyone's grown to like them. It's a very, very good system. Sean Rasberry Gang Supervisor, Tarmac Wavin's Q-Bic Plus ticks all the boxes for Norfolk County Council Project The Thetford Roundabout Norfolk County Council Site team Tarmac Solution Wavin's Q-Bic Plus geocellular attenuation solution To watch the NCC project video and inspect Q-Bic Plus closer, visit: qbic.wavin.co.uk " ADVERTISEMENT FEATURE

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