Articles & Case Studies

London industrial park storms ahead with Graf UK system

Posted: Friday 2nd December 2016

To ensure effective drainage and flood management - and full compliance with local authority discharge requirements - a large-scale new-build industrial estate in London has been fitted with a stormwater attenuation system from water management specialist Graf UK.

The brand-new Crabtree Manorway North estate in Belvedere, South East London comprises three industrial units (including offices and a warehouse). When embarking on the project, contractors Readie Construction needed to find an efficient and cost-effective stormwater solution that would not only protect against flooding, but would meet strict run-off criteria set by the London Borough of Bexley. The system also needed to withstand the weight of the heavy lorries operating on the premises daily.

Having worked together on previous projects, Readie Construction approached Graf UK for a versatile and sustainable solution. To comply with run-off requirements and provide reliable flood prevention for the future, the Graf UK team specified, designed and installed a tailor-made 900 m3 EcoBloc Inspect Flex system - built from around 4,500 heavy-duty blocs.

Mark Caswell, technical product manager at Graf UK, explains: "With a whole host of unique design and installation challenges, the Crabtree Manorway install truly was a complex one. The estate's developers needed to find a stormwater solution that could cope with commercial goods storage, high traffic volumes and heavy lorry loads overhead - and also comply with the council's run-off rate of 9.7 litres per second. What's more, the underground tanks needed to fit around the concrete and metal foundations supporting the units' flooring. As a made-to-measure, heavy-duty and reliable solution, our systems proved to be the only ones that were fit for purpose."

"As well as providing the design flexibility and durability to meet the spec, the EcoBloc system is surrounded by a geomembrane for effective attenuation purposes. This provides ultimate control of water back into natural groundwater reserves, and ensures the flow rate set by the borough is met. The tanks have also been specified with in-built inspection channels, making for straightforward system maintenance in the long term."

Buried two metres underground, the Graf UK EcoBloc tanks have a gross volume of 205 litres. Made from 100% recycled plastic, they have a heavy-duty lorry-bearing capacity of up to 60 tons, with a dense 1,000mm earth covering. This makes them the perfect choice for the busy industrial estate.

Crabtree Manorway's complete stormwater solution was also specified to include three of Graf UK's Vario 800 Flex shaft systems, which accurately match the dimensions of the EcoBloc Inspect Flex tanks to act as fully integrated inlet shafts. This provides easy access for Graf UK's advanced camera technology, which is used to regularly check for any silt or gravel build-up - ensuring optimum performance for the lifetime of the system and full peace of mind for the future.

Bill Lee, Project Manager, at Readie Construction says: "We've worked with Graf UK on a number of projects now, and we've consistently been very happy with the results. When the consultant engineers first sent us the initial drawings for Crabtree Manorway North, we immediately asked Graf UK to take a look and design a bespoke stormwater system.

"Due to the nature of the install, it was important to us to work with Graf UK, not only because we trust their expertise, but also because their products offer the greatest degree of flexibility. The modular EcoBloc elements can be made into any shape or size - and that was precisely what we were looking for in this particular case."

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