SuDS Retaining Wall

Attenuation Pond, Webwall, Chesterwell, Colchester, UK

Project Information

Client:Mersea Homes
Contractor:J Breheny Contractors / Geogreen Solutions
Consultant:JBA Consulting
Product:Webwall Geocell
Trigrid EX30/30 Reinforcement Georid
Fildrain 7DW Drainage Geoomposite
Quantity300m2 of wall facing
Benefits:- Flexible natural curving front face
- Green vegetated finish
- Material cost saving through use of site won materials
- Fast and simple construction


Project Description

A residential development consisting of conventional low rise domestic houses, the site is situated next to protected Chesterwell Woodlands in the north of the historic town of Colchester. The plans included several phases, the first being housing with further phases including primary and secondary schools along with shops and community centre developments.

Mersea Homes received planning permission for this development from Colchester Borough Council after nine years in the planning stage where local residents concerns were addressed with regards to the greenfield development. The plans required the site to blend in perfectly with the ancient woodlands and rural surroundings and create a sense of place and peace.

The Challenge

To achieve planning consent, the future discharge of rainwater from the proposed scheme to local watercourses had to be regulated. The development needed to offer a sustainable storm water run-off scheme and any negative impact on the environment needed to be as minimal as possible. The planning approval included a commitment to protect existing open spaces and create new areas of green space for the wider community. To achieve sufficient rainwater storage once the full site was developed required a sizable attenuation pond which blended with the contours of this shallow valley site. In order to avoid excessive land take a sympathetic retaining wall system was required to two sides of the pond.

The Solution

ABG’s in-house Technical Department proposed a curvilinear ABG Webwall geocell facia, reinforced using ABG Trigrid EX geogrid with behind slope structural drainage achieved using ABG Fildrain drainage geocomposite. Webwall geocell is a three dimensional cellular confinement system which with Trigrid geogrid reinforces locally won fill material to form a steep retained surface reducing the requirement to import expensive structural fill. The green front cells are filled with topsoil and then planted with selected plant species.

The initial green face of the Webwall geocell is intended to be fully hidden behind planting giving the effect of a completely vegetated wall. Specialist installer Geogreen Solutions offered supervision assistance to the contractor to build the wall.

ABG Webwall geocell, Fildrain drainage geocomposite & Abgrid Geogrid uses in a steep sloped green wall application

ABG Webwall geocell, Fildrain drainage geocomposite &Trigrid geogrid used in a steep sloped green wall application.


ABG Technical Department proposed a design for the retaining wall system to the consulting engineer including a biodiverse finish, a flexible facing and significant material cost saving.

Contact ABG today to discuss your project specific requirements and discover how ABG past experience and innovative products can help on your project.

Installation of the green faced Webwall geocellThe design incorporated Webwall design front face, Trigrid geogrid reinforcement and Fildrain drainage geocomposite. Here the front green cells are being filled with topsoil. Fildrain structural drainage strips are visible on the cut slope.
Webwall geocell cells being filled with site won soils
Development plan of the Chesterwell projectFuture development includes: 1) Beauty spot in Chesterfield Wood; 2) New schools, and; 3) Shops and Community buildings
Original aerial view of the development siteOriginal large green open space which required SuDS planning and high rainwater retention capacity within the attenuation pond


Webwall Geocell

ABG webwall is a flexible geocell retaining wall system that utilises geocell technology. Using Webwall geocell for green faced walls with near vertical faces can be built quickly and easily with the added benefit of using site won materials as fill

more...

Webwall green wall earth retaining wall soil confinement geocell system
 

Products

Webwall Geocell

ABG webwall is a flexible geocell retaining wall system that utilises geocell technology. Using Webwall geocell for green faced walls with near vertical faces can be built quickly and easily with the added benefit of using site won materials as fill

more...

Webwall green wall earth retaining wall soil confinement geocell system
 

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