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Swinden No.1 & Lee Green impounding reservoirs (Lancashire, UK)
In what is described as “an exemplary scheme” by the British Dam Society, GHD provided contractor VolkerStevin with civil, structural, geotechnical and temporary works design services for £4.5m of ‘Interest of Safety’ works to two of United Utilities’ large raised reservoirs. Swinden incorporated a new labyrinth overflow weir, tumble bay and spillway chute discharging to a stilling basin. Lee Green required a new a debris barrier, overflow weir, baffled spillway chute and stilling basin. Many of the design concepts and construction methods were chosen as a result of particularly challenging site conditions, exacerbated by a very harsh winter. The project was named Medium Project of the Year at the Institution of Civil Engineers’ North West Awards; it also won the Environmental Best Practice title at the Green Apple Awards.
West East Link Main (Greater Manchester, UK)
GHD was retained by contractor J Murphy & Sons to carry out temporary works design for a new United Utilities water pipe measuring 1.2 m in diameter. This would reinforce the regional water supply network between Liverpool and Manchester both in the short and long-term. Over its 55 km length, the main crosses approximately 30 major obstructions, including the M6, M61 and M66 motorways, the West Coast Main Line railway, the Manchester Metro Link, canals and rivers. GHD undertook designs for tunnel drive and reception shafts including collar design, shaft eyes, thrust walls and settlement checks. Shafts were typically 7.5 m in diameter and up to 35 m deep, constructed using underpinning, caisson and wet caisson techniques.
Barrow Hill Service Reservoir (London, UK)
GHD was invited by Thames Water’s contracting partner, GBM joint venture, to carry out assessment and detailed design work for this 25 ML/D twin-cell service reservoir on the site of the existing 19th-century reservoir in Primrose Hill Park. Advance work to demonstrate the strength of the clay ground led to approval for a 225 mm-thick slab, rather than the client’s 250 mm standard, deepened for walls and columns. Detailed assessment of ground conditions allowed a single excavation operation with a 1:1 batter to formation level across the entire site.
Lostock Water Treatment Works process optimisation (Lancashire, UK)
GHD was retained by United Utilities’ contracting partner KMI+ to complete civil, structural and geotechnical design services for this high-profile, £14m project. This optimisation would provide an additional 60 ML/D output for a 180 ML/day capacity works to support future Haweswater Aqueduct outages. Increased filtration capacity was provided by six 14 x 4.5 x 6.5 m high prefabricated stainless steel filter units with in-situ 42 x 12 x 8.5 m deep concrete backwash tanks and other equipment to produce the additional filtration area and reduce loading on the existing filters. The project garnered significant recognition in the industry; it was awarded the distinction of Large Project of the Year at the Institution of Civil Engineers’ North West Awards, named Water Management and Supply Winner at the Institution of Chemical Engineers’ Global Awards, and highly commended in the Utility Infrastructure category of the Association for Consultancy & Engineering Awards.
Frankley WTW GAC plant and interstage pumping station (Worcestershire, UK)
GHD mechanical engineers developed contractor Morgan Est’s initial concept into a detailed design for Severn Trent Water’s new £31m granular activated carbon (GAC) plant to enable water abstracted from the River Severn to be treated at Frankley Water Treatment Works. We designed pipework, supports, access platforms and lifting provision, removing a significant amount of proposed floor slab penetrations. Using three-dimensional modelling, we redesigned pipework to sit above slab level whilst ensuring good access for maintenance and operational staff. GHD also completed the mechanical design for an interstage pumping station. This project won Health and Safety and Best Communicator awards at the Severn Trent Water ‘Being the Best’ Awards.
Preston 7 unsatisfactory intermittent discharge scheme (Lancashire, UK)
GHD undertook complex design for United Utilities’ contracting partner KMI Water for an interceptor and storage tunnel measuring 2.75 m in diameter and 3.5 km in length and providing 40,500 m3 of storm storage. The scope of this £114m project to upgrade the area’s ageing sewer system also included 13 large diameter shafts, 9 km of rising main, manholes and pipework. Our work also included multidisciplinary design for the construction of a screens chamber and a 27 m wide, 35 m deep terminal pumping station in challenging ground conditions using advanced geotechnical techniques. The project won the awards for Innovation and New Installation at the United Kingdom Society for Trenchless Technology Awards, was highly commended at the Ground Engineering Awards and was commended for the Ribble Estuary terminal pumping station at the Concrete Society Awards.
Ashton Wastewater Treatment Works (Greater Manchester, UK)
GHD was retained by KMI+ to complete civil, structural, geotechnical and architectural design services for United Utilities’ new £35m, 45 ML/D wastewater treatment works built alongside the existing plant. Our design work included inlet works, primary treatment, interstage pumping station, activated sludge plant and final settlement tanks. Integrated teamwork ensured continuity of design and realised over £2.1million of savings for the project through innovative design solutions, with the plant put into use eight months ahead of the regulatory date. This project was a finalist for the British Construction Industry Awards and was highly commended at the Association for Consultancy & Engineering Excellence Awards.
Burnley Wastewater Treatment Works thermal hydrolysis plant (Lancashire, UK)
GHD was retained by contracting joint venture KMI+ to complete multidisciplinary design work for a new United Utilities’ 140,000 m3/a thermal hydrolysis plant to improve sludge digestion following the introduction of the 2008 Nitrate Pollution Prevention Regulations. We also designed sludge-thickening centrifuges, a polymer storage / dosing kiosk, a thickened sludge cake silo, a liquor treatment plant and a de-gassing tank. Design challenges included maintaining operation of existing equipment, integrating new systems and coordinating vendor packages.
Keswick Wastewater Treatment Works AMP4 quality & unsatisfactory intermittent discharge scheme (Cumbria, UK)
GHD provided contractor KMI+ with multidisciplinary design work, hydraulic support and hazardous area classification for this £23M United Utilities scheme to clean up Bassenthwaite Lake and alleviate sewer flooding in the town. Our team designed new sewers and storage tanks in the town centre and boosted capacity at the treatment works. Improvements at the treatment works focussed on an enhanced phosphate removal consent imposed by the Environment Agency and the replacement of old process equipment. We designed new inlet works, new primary settlement tanks, a primary de-sludge system and transfer pumps, a ferric storage and dosing system, disc filters and a new outfall structure. The project won the award for Community Project of the Year during the Institution of Civil Engineers' North West Awards.
Shell Green sludge processing centre SHARON reactor (Merseyside, UK)
The Mersey Valley (Shell Green) processing centre is United Utilities’ strategic digested sludge incineration facility. Retained by the Veolia-Costain joint venture S3JV, GHD undertook multidiscipline design work for the SHARON reactor, a biological treatment system for the removal of nitrogen from the sludge centrate resulting from the dewatering process. We worked with equipment vendors and S3JV sub-contractors, using techniques such as 3D modelling, AutoPLANT and intelligent P&IDs to develop a fully integrated design.
Stoke Bardolph STW energy crop anaerobic digestion plant (Nottinghamshire, UK)
GHD carried out civil/structural design for contractor Interserve on this 2MW energy crop digestion and Combined Heat and Power (CHP) plant on land adjacent to Severn Trent Water’s Stoke Bardolph Sewage Treatment Works. The project provides power generation from biosolids, which are used as an agro fertilizer to grow maize. The plant comprises 10,000 m² of silage clamps, milling and fermentation followed by digestion, with the biogas being used to power the CHP plant. Power generated is used to supply the adjoining sewage treatment works, with any surplus being fed into the national grid network. Stoke Bardolph is the first large-scale CHP plant in the UK that is powered from maize energy crops. The project was recognised by the Institution of Civil Engineers, taking the Large Project of the Year win at the East Midlands Merit Awards.
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