Page 33 - Inspiring-Paving-Kerbs

CASE STUDY CASE STUDY PERMEABLE PAVING

Sixfields Leisure and Retail Centre Stump Cross Housing Estate

Large scale sustainable drainage project Bringing permeable paving expertise to a social housing development

Project: Sixfields Leisure and Retail Centre Project: New Housing Development
Client: Northampton Borough Council Client: Jack Lunn Construction for Synergy Housing
Product: Omega Flow The two main car parks, of 19,000m² Product: Road - Omega Flow 80mm Brindle Permeable paving is often seen as
Size: 52,000m 2 Driveways - Omega Flow 60mm Brindle
and 16,000m², were both constructed being a significant departure from
The site at Sixfields lies on the outskirts of Northampton and had using Omega Flow permeable paving. Brett worked closely with contractor Jack Lunn Construction on conventional pavement construction
been derelict since the 1970’s when it was used as a landfill site Additionally, 17,000 m² of roadways the paving design for the Stump Cross social housing development incurring more time and, inevitably, more
following previous use for gravel extraction. The site also included linking the car parks were also in Pontefract, West Yorkshire for their client Synergy Housing. costs... however, working closely with
a sensitive nature reserve containing a unique habitat for wildlife. constructed using Omega Flow, allowing Brett Landscaping on the design and
surface water run-off to pass down into Early on it was decided that only a Sustainable Drainage construction of the permeably paved
The Sixfields development is part of the Northampton Brownfield System (SuDS) would work for the access road in this housing
Initiative - a mixed urban regeneration project containing new the sub-base and released at a constant development. areas on this site, we found that it was no
housing, a rugby club, football pitch and large car parks, as well rate into a brook. big deal, just a bit different from normal
as a nature reserve. Sitting on the bank of the River Nene, it was This was because the existing drainage infrastructure was already pavement construction.
evident from the start that any design had to minimise any future working close to its capacity and would not be able to cope with
risk of flooding if it was to be viable. any additional run off from this, or any other new, developments.
Brett Landscaping advised the client on the advantages of using However due to the planned high density of this housing project,
a sustainable drainage system to minimise the risk of any future SuDS devices such as swales and ponds would not be feasible
flooding on the site. The two main car parks, of 19,000m² and as there was insufficient available space. A permeable pavement
16,000m² respectively, were both constructed using Omega Flow
permeable paving. Additionally, 17,000 m² of roadways linking the was therefore chosen as there is no additional land take involved,
car parks were also constructed using Omega Flow. making it the most cost effective solution.
The finished design allows surface water run-off to pass down Fortunately, site investigations found that the permeability of the
into the sub-base providing attenuation before it is released at a sub-grade was good enough for System A to be used whereby
constant rate through five outfalls into a brook. water could be allowed to infiltrate totally into the sub-grade
One of the key advantages of permeable paving is that any rather than discharging into the nearby surface water drainage
hydrocarbons and other pollutants are captured in the sub-base system.
where they are then broken down naturally within the permeable Brett also worked with Jack Lunn to design a ‘service strip’ to feed
pavement construction layers. This removes the need for catch individual plots with gas, water and electricity.
pits and oil interceptors on the site thereby helping to reduce
the overall project cost to the client - as well as maximise the Rob Martin of Jack Lunn Construction said “a close working
available space for development. relationship with Brett helped ensure the project ran smoothly -
View the video at www.brettpaving.co.uk and came in at a comparable cost to traditional paving.”

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