A27 Chichester Drainage Scheme

CEEQUAL Excellent (80.5%) – Whole Project Award
Version 4, Apr 2015 | Chichester, London UK

ClientHighways Agency
DesignerBalfour Beatty Mott MacDonald JV
ContractorBalfour Beatty Mott MacDonald JV
Assessor: Helen Denham

Project Summary

The works are located on the A27 Chichester Bypass between the A259 Fishbourne Road roundabout and the A285 Portisfield Way roundabout. The A27 in this location consists of a Dual All Purpose 2 lane Carriageway with roundabout junctions except for the B2144 Oving Road which is a signal junction.

The works involve the renewal of the existing drainage linear soakaways to relieve the re-occurant flooding along the bypass. The existing drainage is by drainage channels to short lengths of carrier drains to linear soakaways. Primarily the drainage renewal is of the soakaways to bring them back to full operation. The works will also include the construction of a pumping station and the repair of category 3-5 defects following surveys in 2010.

Waste was designed out of this scheme by incorporation of geocelluar units for soakaways reducing the need for trench excavation and therefore waste from cut and fill.

Trenchless technology also reduced the need for excavation and therefore waste during the installation of the link to the pumping station at Whyke Roundabout, successfully achieved in 2014 following a delay due to problems in the initial exercise.

It was assumed that 100% recycling rates could be achieved for all waste streams listed.

Achievements

Energy Assessment Results: LifeCYCLE assessment identified the following savings.

The majority of the additional carbon in the traditional soakaway is within the concrete drainage pipes that are required, which accounts for the large difference. Over 1,840m of concrete piping was needed, which accounted for 83% of its total capital carbon for the soakaway.

The difference between the Standard total carbon in 2012 to the Geocellular total carbon in 2013 and 2015 is the result of the change to the design and as it evolved the associated carbon was reduced still further.

When comparing the Geocellular total carbon at inception with the geocellular at construction we see that there was an overall percentage drop of 4%. This equates to 17.6 tonnes CO2e. This shows that efforts were made to reduce the total carbon by reducing the construction materials required.

The basic lifecycle analysis for the Geocellular block design indicated that 53% of the carbon emitted was during the initial works over a 50 year life span and it was found that 22% carbon saving could be achieved with the geocellular blocks design.

CEEQUAL insights and case studies

Browse the latest insights, thinking and case studies from CEEQUAL

 

BREEAM And CEEQUAL On The Move
| CEEQUAL News

BREEAM & CEEQUAL: On The Move

BREEAM Director, Dr Shamir Ghumra provides insight on how BREEAM and CEEQUAL have helped city and town planners deliver better, ...
Read More
RAF Lossiemouth | CEEQUAL
| CEEQUAL Case Studies

RAF Lossiemouth – AOS Project

The project is a full refurbishment of all major airside pavement surfaces at RAF Lossiemouth for a new Boeing P8 ...
Read More
Stockholm Extended Metro Arenastaden Plattform | CEEQUAL
| CEEQUAL Case Studies

Stockholm Extended Metro – Arenastaden

The extension of the Stockholm Metro is vital to make Stockholm a vibrant and accessible city with a sustainable public ...
Read More
Old Colwyn Coastal Defence and Active Travel Scheme | CEEQUAL
| CEEQUAL Case Studies

Old Colwyn Coastal Defence and Active Travel Scheme

The scheme represented an opportunity to build on the success of previous phases of the Colwyn Bay Waterfront Project with ...
Read More
Viking Link Bicker Fen Access Road | CEEQUAL
| CEEQUAL Case Studies

Viking Link (Bicker Fen) Access Road

The Viking Link team used CEEQUAL to deliver a sustainability-driven project. They achieved a 30% reduction in kgCO2 equivalent of ...
Read More
Strule SEC – Site Preparation Works
| CEEQUAL Case Studies

Strule SEC – Site Preparation Works

The purpose of the project was to redevelop the former army barracks at Lisanelly and St Lucia and to provide ...
Read More

Get in touch

Contact us now or call us on 0333 014 7880 if you would like to talk to our team about how CEEQUAL can support you.