We have a growing reputation for the design and construction of both infrastructure and non-infrastructure assets to the water industry including water and wastewater treatment works, pumping stations, surface water drainage, long sea outfall pipes and reservoirs.
Our experienced engineers work collaboratively with our customers to develop innovative solutions to technical challenges whilst driving efficiency savings.
The contract involved the installation of a humus tank, desludging chamber modifications, pump station control adaption, valve chamber, amonia monitor chamber, new potable water pipelines, manhole chambers, hardstandings and minor associated mechanical and electrical works, including service trenches.
Fishbourne Water Main
Customer: Portsmouth Water Ltd
The works involve the replacement of the FRC main with 800m of 450mm diameter ductile iron water main, with associated bends, valves, fittings and thrust blocks relocated away from the main building, artefacts and mosaics at the Fishbourne Roman Palace, one of the most important archaeological sites ever discovered in Britain. Excavation work was closely monitored by archaeology specialist, Wessex Archaeology Ltd who preserved, catalogued and reported the minor finds encountered.
Outfall 15, St Mary’s Island
Customer: Countryside Maritime Ltd
The project was procured as a two stage tender, with Stage 1 Pre-Construction comprising the development of the scheme from outline design through to construction stage which, as a D&B scheme, required us to appoint a design engineer and develop all the licence applications right through to issue. Due to its location, the project had a number of stakeholders all of which had input of varying levels in respect to licence applications, such as an MMO licence, river works licence, a Water Framework Directive (WFD) assessment and Environment Agency consent.
The works comprised the construction of a surface water outfall and a viewing platform. This complex civil engineering project included CFA piling works to 20m deep with restricted access and loading constraints, part removal of the existing flood defence wall, 1200mm diameter pipework and retaining structures, completed on both the landside of the existing flood wall and below the Mean High Water Springs (MHWS) level.
The surface water outfall included a reinforced concrete headwall built into the existing stone revetment, which was established during the Napoleonic period by captured French sailors, together with the establishment of a 1200mm diameter concrete drainage pipeline complete with two 2.1m diameter manholes. These adoptable works were designed and installed to Sewers for Adoption 6.
Part of the contract also included creating a breakthrough to the existing riverside walkway to include footpath ramps, an observation platform and new inland access from the walkway. In order to build the headwall in the tidal range, a temporary sheet piled cofferdam was installed that allowed works to progress in normal working hours, which was beneficial for the local residents living adjacent to the site.
The completion of these works has now allowed the client to build the second phase of their residential development since they have the consented drainage outfall constructed, allowing for the developments’ storm water drainage to be connected.
Wessex Flood Reservoirs
The repair of reservoirs in five different works areas:
- Cribbs Causeway Flood Storage Reservoir
- Tubbs Botton Flood Storage Reservoir
- Bruton Flood Storage Reservoir
- Curry Moor Flood Storage Reservoir
- Westford Flood Storage Reservoir
The project addressed a number of issues highlighted by the flooding experienced on the Somerset Levels during the 2013/2014 winter.
The works were a result of recommendations by the Reservoirs Engineer following the floods and included: sheet piled cut-off walls, reinforced concrete headwalls, strengthening of earth structures such as dam crests and spillways and re-alignment of watercourses.
Significant additional works were instructed during the contract period taking the project value from £570k to £3m at final account. Whilst the construction activities were relatively straightforward the logistics of managing a number of remote sites concurrently were less so.
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