Case Studies

WINEP bathing waters project in North Devon to reduce the risk of stormwater overwhelming outlying pumping stations

CIPP relining of 840m of large diameter pipe following a proactive CCTV survey that revealed hydrogen sulphide damage

Temporary overpumping solution facilitates CIPP re-lining using ultraviolet and water cure techniques

Successful delivery of a £7m project to reduce risk of out-of-sewer flooding, capitalising on the benefits of collaboration through NEC4 Option C Contract

The Red Doles Combined Sewer Overflow (CSO) neighbours the Huddersfield Broad Canal and a Network Rail bridge. The CSO serves a catchment covering approximately 3.8km2, predominantly consisting of residential properties and accommodating around 8512 people. The majority of the Fartown area of Huddersfield drainage operates as a combined system, with Red Doles receiving flows from […]

Re-lining over a kilometre of existing pipe to upgrade an important sewage pipeline serving an Ayrshire beauty spot

Delivery of complex civils to intercept combined sewer overflows and divert into the Thames Tideway Tunnel

An integral part of NI Water’s £18m Ards North Wastewater Improvement Project to improve the quality of bathing waters in this scenic part of the Ards Peninsula

The Ards Peninsula is a scenic area in County Down, situated on the north-east coast of Northern Ireland. It separates Strangford Lough from the north channel of the Irish Sea and its coastal towns and villages are popular with day trippers and caravanners alike. By 2020, the wastewater treatment works serving the villages of Carrowdore […]

September 2022 saw the successful completion of a new kilometre outfall pipeline in Arklow, Ireland. The lack of wastewater treatment facilities in Arklow resulted in untreated wastewater being discharged directly to the Avoca River. The design and construction of a new wastewater treatment plant and long sea outfall was required to improve the water quality […]

Dawlish is a traditional seaside town on the south coast of Devon, approximately 12 miles south of Exeter and is a popular holiday and day trip destination. South West Water (SWW) and Galliford Try’s objective was to ensure that the bathing water quality did not deteriorate within the next 20 years by ensuring that there […]

Located south of the village of Chilton Foliat and north-west of the town of Hungerford there is an existing sewage treatment works (STW) that serves a population of approximately 400 people. The works discharge into the River Kennet, one of England’s most important chalk streams which is home to an extensive range of rare plants […]

Using the MS1800 for the on-line detection of hydrocarbon contamination in a municipal sewerage system

Guildford Borough Council (GBC) are progressing with the development of approximately 41 hectares of brownfield land located along the west bank of the River Wey as it runs through central Guildford and north through Slyfield Industrial Estate. Guildford Sewage Treatment Works (STW) lies within this land and requires relocation in order to enable the development […]

Improving water quality in the River Medlock by installing new powered screens at existing sites in Oldham, Greater Manchester

Marhamchurch is a small village around 2.4km south of Bude and has a population of just over 800. Sewage from this village is pumped to a nearby large sewage treatment works which processes the waste from Bude and the surrounding area. The existing Marhamchurch Sewage Pumping Station (SPS) was built around 50 years ago and […]

North-west of Nottingham and separated by the River Erewash, two of Severn Trent’s sewage treatment works are situated within 2.5km of each other; part of the legacy of the times of the public statutory undertakers. Heanor Milnhay STW in Derbyshire has a dual-stream process, with part of the flows going through trickle filters and the […]

The Rivers Lugg and Wye have been identified as having high levels of phosphorus, which is causing eutrophication of these watercourses. Norton Wastewater Treatment Works (WwTW) discharges treated final effluent to the Norton Brook, a tributary of the River Lugg. Presteigne WwTW discharges treated final effluent directly into the River Lugg downstream of the Norton […]

Potters Way, located in the Fengate area of Peterborough, is a recent housing development next to the A1139. The development was built on the grounds of the former Fengate Water Recycling Centre (WRC) which closed in 1988 following the construction of the Flag Fen WRC. In early December 2018, Anglian Water became aware of the […]

Section 101a of the Water Industry Act requires that sewerage providers deliver and fund first time sewerage (FTS) schemes where the current drainage for two or more properties is unsatisfactory and where a public solution is viable. Unsatisfactory drainage includes situations where environmental or amenity problems caused by uncontrolled discharges from septic tanks or cess […]

St Augustines Road is a busy thoroughfare in Chesterfield linking the town to Matlock and the south-eastern edge of the Peak District. Lying within the Yorkshire Water (YW) waste catchment area, the road is steep in its nature with gradients often exceeding 7%. Due to the local hydraulic catchment and topography, during heavy rainfall events […]

The village of Stratton, which is located just outside Bude, Cornwall, used to have its own sewage treatment works, but this was replaced by a sewage pumping station (SPS) many years ago when it was decided that Bude and the local villages would have all their sewage treated at a single, large treatment works at […]

The Stroud Sewerage Strategy is a major investment by Severn Trent which is required to overhaul of the existing sewer network by installing almost 3.5km of enlarged sewer pipe, separating surface water from the sewage network, creating additional storage with smart controls to hold stormwater back during large storm events before returning it to the […]

The Thames Tideway Tunnel Project is a 25 km (16 mi) combined sewer under construction under the tidal section of the River Thames as it runs through London. It will significantly increase the capacity of London’s sewerage system (large sections of which were built in the 19th century), and be able to capture, store and […]

Both Blackburn WwTW and Darwen WwTW discharge final and storm effluent to watercourses that are tributaries of the River Darwen, feeding into the River Ribble estuary and the bathing waters of the Fylde coast in the Irish Sea. At Blackburn WwTW, which provides treatment for a population equivalent (PE) of approximately 400,000, construction of the […]

Wessex Water were served under S98 of the Water Industry Act to provide an offsite foul water connection for St Modwen’s new Chippenham Gateway development. This commercial development consists of one million square feet of commercial development and potentially a 150-room hotel. An initial modelling appraisal identified insufficient capacity in the local public sewerage network […]

In the PR19 agreement, water companies were encouraged to provide resolution to long-standing flooding problems being experienced by customers – but allowed a less prescriptive approach on the actual projects defined in the Water Company’s Price Review submission. This new process allowed the water companies a degree of discretion on the number and frequency of […]

In the PR19 agreement, water companies were encouraged to provide resolution to long-standing flooding problems being experienced by customers – but allowed a less prescriptive approach on the actual projects defined in the Water Company’s Price Review submission. This new process allowed the water companies a degree of discretion on the number and frequency of […]

The North London Heat & Power Project is a ten-year, £1.2 billion programme to replace the current Edmonton energy from waste facility. It is being constructed on behalf of North London Waste Authority at the Edmonton EcoPark and includes a world-class Energy Recovery Facility (ERF), to generate energy from waste in the form of heat […]

Ravenhill Avenue is located in south Belfast, close to the city centre. It is a densely populated residential area which has seen recent development of historically industrial sites. The sewer infrastructure in Ravenhill Avenue dates back to the early 20th century, and is therefore in poor condition and undersized to deal with today’s flows. Unfortunately, […]

Stroud is located in Gloucestershire near the southern boundary of the Severn Trent region between Gloucester and Bristol. The catchment is a mix of urban and rural areas and has a population of circa 67,000. The sewerage network is primarily a combined network with Wallbridge Combined Sewer Overflow (CSO) being a key asset close to […]

In September 2014 Severn Trent received an application under Section 101A of the Water Industry Act to provide first time sewerage to 11 properties in the Nottinghamshire village of Teversal. The outcome of an assessment of the existing sewerage provisions identified environmental or amenity problems at 18 properties and concluded that the provision of a […]

A complex ground improvement scheme has been designed and installed at Earl Pumping Station (EARPS), one of Tideway East’s sites, to enable the excavation and permanent works for the combined sewage overflow (CSO) chamber to be carried out. Challenges such as local contamination, site congestion, costs and time scale had to be overcome by delivering […]

Ashbourne Sewage Treatment Works (STW) in Derbyshire serves a population equivalent of 48,259 from both domestic customers and a high trade load, primarily from poultry processing. There has been a works in this location since the 1930s, with existing processes including inlet pumping, 2mm fine screening, grit removal, primary settlement, secondary treatment through an oxidation […]

Blackburn WwTW was constructed in the 1960s and principally treats domestic crude sewage from the Blackburn catchment, with two major additional contributions; a high strength trade effluent from the InBev brewery and an ammonia rich return liquor flow from the sludge treatment plant. The key river water quality/water framework directive parameters within the revised environmental […]

In the 1850s, London’s population was approximately two million. In 1858, predicting population growth, Sir Joseph Bazalgette constructed a combined sewerage system collecting both wastewater from homes and businesses, and rainwater run-off, to serve a population equivalent of four million. Now, with London’s population approaching nine million, the sewerage network can become overloaded during severe […]

Lowdham is a village in Nottinghamshire that had a history of external and internal sewer flooding to properties, caused by hydraulic incapacity of the combined sewer network. A new 1400m3 offline storage tank was required along with catchment resilience work, which included working in partnership with the local authority to resolve surface water flooding, by […]

Customers’ residential properties on Maryville Avenue, South Belfast, had experienced out-of-sewer flooding during periods of heavy rainfall due to the poor condition of the sewerage infrastructure and the partial collapse of a 375mm diameter combined sewer. This sewer is located within 5m of the Belfast to Dublin high-speed rail line and in close proximity to […]

Large diameter rising main deterioration has become a big capital expenditure because of the risk of major infrastructure failure. The costs of repairing these assets in the event of failure are likely to be very high and characterise a large problem for water and sewerage companies in the UK. Wessex Water’s critical crossing review had […]

The Thames Tideway Tunnel project will upgrade London’s Victorian sewer system, which was developed by Sir Joseph Bazalgette in the mid-1800s for a population of 4 million people. Now with over 8 million Londoners, the system capacity, around 6mm per hour rainfall in the catchment, has been exceeded and the discharges of mixed water through […]

The Tideway project is a new £3.8 billion, 25km long combined sewage storage and transfer system currently under construction in London. The project is divided into three design and build contracts: West, Central and East. The scope of works of the Central Section, the largest contract, includes 12.7km of 7.2m internal diameter tunnel and eight […]

The Tideway project is a new £3.8 billion, 25km long combined sewage storage and transfer system currently under construction in London. The project is divided into three design and build contracts: West, Central and East. The scope of works of the Central Section, the largest portion of the project at over half its length, includes […]

The Tideway Tunnel is a new 25km long combined sewage storage and transfer system that will help protect the ecology of the River Thames by tackling the problem of overflows from London’s ageing sewers. The Central Section consists of eight work sites each incorporating a drop shaft, as well as two tunnel drives. Of the […]

The Tideway Project is a 25km long combined sewage storage and transfer system along the River Thames in central London, UK. The project is split into three design and build contracts with the limits of each contract determined primarily by geology along the alignment. The contract for the Central Section, the longest and most challenging […]

In the heart of London, the largest project in the UK water industry is underway. Tideway is a new combined storage transfer system, commissioned to provide London’s sewage network with additional capacity and prevent pollution of the River Thames. The colossal scheme consists of a 25km TBM bored tunnel with numerous shafts, associated outfalls and […]

The Thames Tideway Tunnel is a major infrastructure project that will intercept the existing London sewerage system, through a 25km-long tunnel and connection tunnels from Acton in West London to Abbey Mills in East London. The tunnel has a finished internal diameter of 7.3m, starting at a depth of 30m below ground until reaching a […]

The Thames Tideway Project is a major infrastructure project that will intercept the existing London sewerage system through a series of tunnels running 25km from Acton in West London to Abbey Mills in East London. There are 22 vortex drop pipe structures and other near surface structures that will intercept existing spills into the Thames; […]

The Thames Tideway Tunnel is a new storage and conveyance tunnel running through the centre of London, mostly under the River Thames. The main tunnel, which is approximately 25km long with an internal diameter of 7.2m, will run from Acton in the west through to Abbey Mills in the east. The project has been split […]

The picturesque village of Walton is located within the heart of Warwickshire adjacent to the River Dene. The existing privately owned sewage treatment facility located on the bank of the River Dene was life expired and would often flood, resulting in pollution to the river. An application was made to Severn Trent under Section 101a […]

To accommodate new housing and commercial growth in the Waverley/Catcliffe area of Sheffield, Yorkshire Water required the design and construction of a new pipeline to transfer the flows from a housing development of 4000 homes to the main Blackburn Meadows WwTW. The pipeline route crossed main dual carriageways, other roads, roundabouts, railway lines and passed […]

August 2020 saw the successful completion of a new 3.5km outfall pipeline comprising of onshore (2.5km) and offshore (1km) sections on the Holderness Coast in Withernsea, East Riding of Yorkshire. Due to continued coastal erosion, the purpose of the project was to relocate the existing Withernsea WwTW further inland and replace the exposed existing long […]

Sewer rehabilitation projects demonstrate the benefits of basalt

Wessex Water has in its management a sewer network of 35,000km, of which approximately 10% have a diameter of >900mm. These represent some of the most critical sewers due to their ability to carry larger volumes of wastewater, and therefore must be regularly inspected and maintained. The Bournemouth Coastal Interceptor Sewer (BCIS) is one of […]

Blackburn WwTW, located at Samlesbury near Blackburn, serves a population equivalent (PE) of approximately 400,000 and discharges final and storm effluent to watercourses that are tributaries of the River Darwen, feeding into the River Ribble estuary and ultimately into the bathing waters of the Fylde coast in the Irish Sea. Over the last 12 months, […]

Hookstone Road CSO in Harrogate, North Yorkshire, is a CSO chamber with upstream and downstream online storage provided by large diameter pipes. During storm events, pass forward flow is restricted by the 200mm outlet pipe and 90 degree bend downstream and partially fills the storage pipes before excess flows pass through a screen at the […]

Kirk Hallam is a village on the outskirts of Ilkeston, Derbyshire in the East Midlands. It had a history of internal and external property flooding from the sewerage network in three separate locations within the catchment. Severn Trent (ST) appointed nmcn PLC (now Galliford Try) as the design and build contractor under the AMP6 framework […]

Operated by United Utilities, the Morecambe sewerage system collects at Schola Green Wastewater Pumping Station (WwPS) located in the west end of the town. From there, flows for treatment are pumped via a 6km long pipeline to Morecambe Wastewater Treatment Works (WwTW), which is situated to the south, near to the village of Middleton. Both […]

Llanelli Wastewater Treatment Works (WwTW) in Llanelli, South Wales, serves the catchment’s 60,000 inhabitants and discharges treated effluent into the Loughor Estuary. The estuary is not only ecologically sensitive, but also a critical natural asset to the local community and to the wider South Wales region. It is a natural capital asset, home to commercial […]

Shakespeare Street in Nottingham is situated at the heart of Nottingham Trent University campus, a short walk from the main square in the city centre. The basements of a number of buildings in the area suffered repeat sewer flooding, ranking inside the top 1% of all flood risks across the Severn Trent (ST) region. In […]

United Utilities is the regional water company for the North West of England, delivering water and wastewater services to 7m people from Cheshire to the Scottish border. Oldham WwTW and Royton WwTW are two major wastewater treatment works located in Oldham, to the north east of Manchester. The Oldham and Royton Integrated Strategy (ORIS) project […]

The Phillipson Street CSO Scheme is located in Wallsend, a suburban area to the east of Newcastle city centre with an industrial past. In the catchment upstream of the existing CSO, a total of 3,869 people are served by a fully combined sewer network. The existing CSO has undergone several upgrades over at least the […]

Located on the edge of Strangford Lough, on the Ards Peninsula, Portaferry Road WwPS serves the eastern catchment of Newtownards, forwarding approximately 25-35% of the wastewater from Newtownards town to Ballyrickard WwTW, located approximately 3km away. Altogether Ballyrickard WwTW receives untreated foul effluent from six major pumping stations located within the Comber and Newtownards catchments: […]

After the implementation of the transfer of private drainage to Wessex Water in 2011, it became imperative that it was necessary to focus more attention on trenchless alternatives for repair of small diameter sewers. Wessex Water’s overall cumulative volume of public sewers doubled overnight from 17,000km to 34,000km, and the majority of that transferred stock […]

In 2017, aBV – a joint venture between Amey and Black and Veatch (now Binnies), and Environmental Techniques Ltd approached client Scottish Water about utilising carbon fibre (CFRP) and glass fibre (GFRP) to provide a 60-year rehabilitation technique to an existing pipe bridge; an approach that has never been used before in the UK Water […]

The Thames Tideway Tunnel is a major tunnelling project designed to mitigate the large-scale pollution problem involving the discharge of sewage into the River Thames. The project consists of a 25km long TBM tunnel under the river along with numerous shafts, culverts and connections tunnels constructed using sprayed concrete lined techniques. These will be used […]

The Chelsea Embankment Foreshore (CHEEF) site is one of the eight main sites in the Central Section of the Thames Tideway Tunnel. The site is located within the Royal Borough of Kensington and Chelsea and will allow for the diversion to the main tunnel of approximately 280,000m3 of sewage that currently discharges into the river. […]

Falconbrook Pumping station (FALPS), located in the London Borough of Wandsworth, is the most westerly site on the Thames Tideway Central Section. FALPS is an active pumping station, discharging approximately 700,000m3 of untreated sewage directly into the River Thames each year via six storm pumps. The current station has a combined discharge volume rate of […]

The Thames Tideway Tunnel is a new super sewer that will intercept, store and convey the CSO discharges to Beckton STW for treatment. The project is divided into three main work contracts: West, Central and East. The Ferrovial Construction and Laing O’Rourke joint venture (FLO JV) has been appointed as principal contractor for the Central […]

As part of Severn Trent’s ongoing duty to provide public sewers under section 101A of the Water Industry Act 1991 (S101a), nine properties in the hamlet of Upperwood, Matlock Bath, required connection to such a system. These properties were served by private septic tanks, discharged into the limestone aquifer below. Severn Trent appointed Galliford Try […]

Withernsea is located in Yorkshire, approximately 18 miles east of Hull on the Holderness Coast. The area is vulnerable to coastal erosion due to the geology being mainly soft boulder clay. Groynes and sea walls being installed in Bridlington and Hornsea have affected the longshore drift, which has caused Withernsea area beaches to narrow, providing […]

Zouch is a small hamlet situated along the A6006 on the border of Leicestershire and Nottinghamshire and consists of 43 properties that had no access to public sewerage. Due to the canalisation of the River Soar, the hamlet is entirely surrounded by water with the main River Soar to the South and the navigable Zouch […]

Anchorsholme Park is located on the coast 4 miles north of Blackpool Tower. The long sea outfall (LSO) project is the third of three phases contributing to improving bathing waters on the Fylde Coast. The objective of the overall scheme is to complete the AMP6 obligations on the Fylde Coast of the ‘moving towards three […]

Barston Sewage Treatment Works (STW) is one of Severn Trent’s medium sized treatment works. The site is located to the east of Birmingham in the West Midlands. The STW treats foul water for the catchment serving Solihull, Shirley, Knowle and other outlying conurbations. It currently serves a population of 39,741 which will increase to 76,036. […]

Both Blackburn WwTW and Darwen WwTW discharge final and storm effluent to watercourses that are tributaries of the River Darwen, feeding into the River Ribble and ultimately impacting on the bathing waters of the Fylde coast. Following on from the Blackburn and Darwen WwTWs (2017) article and Blackburn and Darwen WwTWs (2018) article, both published […]

As part of the ongoing growth of Coventry University, an existing builder’s merchant yard situated off Gulson Road provided a developer with the ideal city centre plot to construct an extensive eight-storey student accommodation building. The brownfield site redevelopment required an existing Severn Trent owned trunk sewer to be diverted prior to the construction work […]

The 2010 Shellfish Waters Directive placed a new obligation on South West Water (SWW) to ‘endeavour to meet’ the Shellfish Waters Regulations ‘Guideline’ Standard (Class B). The Shellfish Waters (SFW) programme of work was to meet legislative requirements to protect or improve designated shellfish waters to support shellfish life and growth, contributing to the quality […]

A £940k flood alleviation scheme has been successfully completed in Nottinghamshire. Mansfield, Gunthorpe Court, was a scheme designed to tackle insufficient stormwater capacity which was causing internal and external flooding to numerous properties in the area. Part of the solution was to provide 480m3 of storage by converting an existing pedestrian subway into an attenuation […]

Medlock Quality Programme is part of United Utilities AMP6 investment programme across the North West and is the third Nereda® Reactor Plant to be operated by United Utilities. The scheme can be split into two distinct areas: (i) the upgrade of Failsworth WwTW to meet the new discharge consent and reduce the volumes of spills […]

United Utilities’ Morecambe sewerage system collects at Schola Green Wastewater Pumping Station (WwPS) located in the west end of the town. From there, flows for treatment are pumped via a 6km long pipeline to Morecambe Wastewater Treatment Works (WwTW), which is situated to the south, near to the village of Middleton. Both sites have sea […]

An article published in the 22 April 1881 edition of the ‘News Letter’, one of Belfast’s leading newspapers, still in circulation today, remarked: “Time was when the Blackstaff [River] ran through the suburbs little more polluted than a mountain burn. Now it has become the greatest eyesore in the town.” This self-same article also published […]

Scottish Water’s £17m Paisley Environmental Project, which started in October 2016, is the largest of its kind that Scottish Water has ever made in Renfrewshire. The project is part of the company’s £250m, six-year programme of work, launched in 2013, to improve river water quality and the natural environment and tackle flooding across the Greater […]

Situated on the outskirts of St Austell on the south coast of Cornwall, Charlestown Harbour is an unspoilt, original Grade II Listed Harbour. Used recently as a key location for the filming of the BBC’s remake of the 1970s hit series Poldark, it has also been used for Dr Who, Tim Burton’s Alice in Wonderland, […]

During 2018, NI Water commenced refurbishment work to one of its critical assets, twin sewerage siphons, known as the Queens Bridge Siphons, in Belfast. The siphons transfer wastewater from a substantial proportion (circa 40,000 population) of the east of the City under the River Lagan to the Oxford Street Trunk Sewer for onward transfer to […]

Renny’s Lane Sewage Pumping Station (SPS) is located in arable farmland to the south of the Belmont and Carville residential estate, north east of the City of Durham. The pumping station has two parallel rising mains which transfer combined flows into the gravity sewerage network which ultimately drains to Belmont Sewage Treatment Works (STW). The […]

In 2013, two villages in Gloucestershire; Slimbridge and Cambridge, were identified by Severn Trent to be suffering from significant infiltration of groundwater. The Slimbridge and Cambridge catchment is home to approximately 1,136 people (2011 census) and contains an ecologically important wetland. Both villages have historically high groundwater levels and extensive CCTV footage of mainline, lateral […]

Stocksbridge WwTW is located in the village of Deepcar on the outskirts of Stocksbridge, approximately 7km northwest of Sheffield city centre. It currently serves a population of 13,000, but this is expected to grow towards 15,000 by 2030. Major housing development is ongoing near the existing works, and as part of this Yorkshire Water reached […]

Stromness is a town situated around the sheltered bay of Hamnavoe on the west of Orkney’s mainland. It has a population of approximately 2200 inhabitants and a population equivalent (PE) of 2,600, due to the local industry; which is expected to grow to 3,600 in the years ahead. The town has a dramatic and unique […]

Southern Water has started the second phase of its major upgrade of the 100-year-old sewer network across Thanet, Kent. Representing an investment of circa £100m over AMPs 5, 6 and 7, the upgrade aims to maintain the integrity of the sewers, reduce the risk of flooding and protect the environment and chalk aquifer that spans […]

The Thames Tideway Tunnel is a new storage and conveyance tunnel running through the centre of London, mostly under the River Thames. The main tunnel, which is approximately 25km long with a maximum internal diameter of 7.2m, will run from Acton in the west through to Abbey Mills in the east. The aim of the […]

The Hammersmith Pumping Station is one of Thames Water’s key sewerage assets in West London. Its catchment covers an area of around 19 square miles, receiving flows from 47 combined sewer overflows (CSOs). The pumping station discharges 51 times in a typical year releasing 2,210,000m3 of untreated sewage and an estimated 557 tonnes of sewage […]

Waterworks Bridge is an oblique three-span structure of approximately 30m length crossing the Waterworks River in Stratford, East London and forms a key part of the Greenway footpath and cycleway providing access to/from the Queen Elizabeth Olympic Park from the south-east. Most significantly, Waterworks Bride houses a section of the Northern Outfall Sewer (NOS). Built […]

Following on from the Blackburn and Darwen WwTWs (2017) article, the site at Samlesbury, Blackburn, has been prepared for the construction of the 72,000m3 structure which will house the innovative Nereda® aerobic granular biomass technology. The Nereda® system will treat crude sewage that has only received preliminary treatment and has been developed to treat the […]

Bournemouth is served by a sewerage tunnel known as the Coastal Interceptor Sewer (CIS), an inverted ‘T’ configuration with two tunnels routed parallel to the coastline and a few hundred metres inland. The two tunnels are routed towards each other and form a confluence equidistant along the coast, turning north and heading inland towards the […]

A burst occurred in a section of 400mm DI rising main within the curtilage of Wessex Water’s Christchurch sewage recovery works in Dorset. The works serve a population in the adjacent catchment of 59,000. The location of the burst was close to a bend in the main, beneath a large diameter primary sedimentation tank, and […]

The Frome Valley Relief Sewer scheme represents a £15m capital investment by Wessex Water to provide additional capacity for the continued development within the North Bristol area. It is the third phase out of a total of four phases which will see wastewater flows diverted from South Gloucestershire to Avonmouth Sewage Treatment Works in Bristol […]

There was evidence of significant internal degradation and deterioration of the King’s Scholars’ Pond Sewer in the vicinity of the Baker Street tube station London Underground tunnel. Degradation included significant cracking of the sewer brickwork as a consequence of considerable settlement of the LUL railway tunnel beneath. The sewer is situated beneath a key artery […]

The Morecambe sewerage system collects at Schola Green Wastewater Pumping Station (WwPS) located in the west end of the town. From there, flows for treatment are pumped via a 6km long pipeline to Morecambe Wastewater Treatment Works (WwTW), which is situated to the south, near to the village of Middleton. Both sites have outfall pipelines […]

The Nine Elms redevelopment area within Battersea includes 21,000 new dwellings, office, leisure and retail space creating 8000 new jobs including the new US Embassy, a relocated New Covent Garden Market site and the Northern Line extension. An integrated water management study completed by Thames Water (TW) in partnership with the Greater London Authority, ARUP […]

Long Marston Sewage Treatment Works (STW) is located approximately 4 miles south of Stratford-upon-Avon in Warwickshire and until recently was treating wastewater from a population of 2,500 in Long Marston and Quinton. Significant development in the catchment will see the population served rise to approximately 15,000 over the next 20 years. The former Ministry of […]

The existing Swinstie Pipe Bridge is located near Cleland, North Lanarkshire, and the structure supports a 450mm diameter iron gravity sewer pipe across the narrow, steep sided river valley of the Swinstie Burn towards Swinstie WwTW. The existing pipe bridge dates from the 1950s and has exhibited signs of severe distress for a number of […]

Thames Tideway Tunnel is the largest water infrastructure project currently under construction in the UK and will modernise London’s major sewerage system, the backbone of which dates back to Victorian times. Although the sewers built in the mid-19th century are still in excellent structural condition, their hydraulic capacity was designed by Sir Joseph Bazalgette for […]

Thames Water Utilities Limited (TWUL) currently transfer a proportion of the wastewater sludge generated by Beckton Sewage Treatment Works (STW) in East London to Riverside STW using 2 (No.) 8km buried pipelines. These twin pipelines were originally installed in the late 1960s to pump sludge in the opposite direction from Riverside to Beckton where it […]

Blackburn and Darwen WwTWs are two of United Utilities’ major treatment works and are located near the former mill town of Blackburn, Lancashire. The Blackburn and Darwen WwTW Integrated Solution (BDIS) project combines new river water quality and bathing water drivers at these two works into a single integrated project. The integrated approach will give […]

Peel Ports required the widening of the Seaforth Passage (Figure 1) within the Royal Seaforth Dock at the Port of Liverpool. The increasing size of modern vessels led to a need to increase the width of the Seaforth Passage, in order to improve the turnaround times for the larger vessels within tidal windows. Farrans Construction […]

The UK has a tremendous legacy of tunnel construction over the last 150 years, from Joseph Bazalgette’s brick sewers in London, through to reinforced concrete designs based upon early engineers such as François Hennebique. Wessex Water has a considerable cumulative metreage of tunnels constructed over the last 150 years, up to 5 metres in diameter, […]

As part of the South West Water Delivery Alliance H5O’s capital improvements programme, the Maltsters Sewage Pumping Station (SPS) Rising Main was identified for improvement after seven historic bursts within the last two years. This rising main is situated near the picturesque village of Tuckenhay, Devon, on the Harbourne River which converges with the River […]

United Utilities is the regional water company for the north west of England, delivering water and wastewater services to 7m people from Cheshire to the Scottish border. Oldham WwTW and Royton WwTW are two major treatment works located in Oldham, to the north east of Manchester. The Oldham and Royton Integrated Strategy (ORIS) project combines […]

The existing combined sewerage system in the area did not have the capacity to take the increase in flow from these two major developments; therefore a new storm sewer was required. The project has also given NI Water the opportunity to update the 1930s combined drainage system in the area by the removal of significant […]

An application for first time sewerage has been made under Section 101A of the Water Industry Act 1991. The application requests Severn Trent Water (STW) provide access to a public sewer for 28 duty (polluting) properties in the Iron Cross, Rushford and Pitchill settlements in the area to the west of Salford Priors, Warwickshire. An […]

London’s sewerage system was designed by Sir Joseph Bazalgette in the 1850s, for a population of four million people. Whilst the Victorian sewers are still in excellent working condition, they are struggling to cope with the demands of the city’s growth. Every year, tens of millions of tonnes of raw sewage pour into the River […]

August 2016 saw the successful completion of a new 2.5 kilometre long sea outfall pipeline on the east coast of Yorkshire, South of Scarborough. The purpose of the project was to replace an existing corroded and collapsed steel outfall pipe with a new solid wall polyethylene (PE) pipeline. The installation required meticulous planning by a […]

Belle Greve Outfalls Replacement is the fifth and final phase of the Belle Greve Wastewater Centre (BGWwC) strategy to provide suitable wastewater treatment and disposal capability for the island of Guernsey. The strategy commenced in 2007 and was completed in 2015 with the replacement of the long sea outfall (LSO) and short sea outfall (SSO). […]

The Ashill Group is building a development of 1,400 new homes and businesses to the east of Southampton on Botley Park Golf Course and the adjacent farmland. As the local sewerage undertaker, it is Southern Water’s statutory duty to connect this development to its foul sewer network. Following initial investigations, Southern Water confirmed that the […]

Situated on the Boscombe promenade in Bournemouth on the south coast of England, one of Wessex Water’s sewage pumping station serves a small number of toilet blocks and cafés, connecting them to the main sewerage network. The pumping station is located at the bottom of a steep cliff, 35m high, with a 100mm cast iron […]

Bellway Homes Ltd submitted an application for foul and stormwater sewers requisition under Section 98 of The Water Industry Act 1991 for a new housing development in Beeston, Nottingham. With no pre-existing drainage on the site it was necessary for the drainage from the 128 new properties to extend across 3rd party land and into […]

Hastings Beach on the southern coast of the UK was identified at risk of failing the European Union revised Bathing Water Directive. If the bathing water failed, Hastings Borough Council (HBC) would be legally required to put up signs warning the public of poor water quality. MWH (now Stantec UK) targeted ‘high beneficial’ interventions by […]

As a result of long term flooding problems in Newark, Severn Trent Water set up and now chair the Newark Flood Forum in order to work closely with national and local government agencies and the wider Newark community, including those directly affected by flooding. The purpose of the forum is to ensure that the views […]

Thames Water’s Lee Tunnel will create a cleaner, healthier River Thames by capturing combined sewer overflows at Abbey Mills Pumping Station, preventing 16 million tonnes of stormwater and sewage from being discharged into the River Lee each year. Up to 385,000m3 of stormwater and sewage will be stored in the 7km long tunnel and transferred […]

Ramsgate is a seaside town on the North East Kent coast; its coastline and harbour attracts thousands of tourists each year. The wastewater from the town is pumped to Weatherlees Hill Wastewater Treatment Works, situated inland over 6km away. Over a 15-year period the pipeline had suffered a number of bursts and needed replacing as […]

During extreme weather conditions experienced across the UK in 2014, coastal areas saw conditions that would cause major flooding for residents and major concerns for all utility companies that had infrastructure within the affected areas. Portland being one of the most exposed coastal locations in the South suffered more than other areas. At the height […]

Salcombe is a popular tourist town in south Devon with a resident population of 2,500 and a peak tourist population of 3,300. The main one-lane street becomes packed with holiday makers and second home owners in the summer months. The main town area is low-lying and runs alongside the Kingsbridge Estuary, although interestingly there are […]

Construction of the Shieldhall Tunnel, the biggest investment in the Glasgow wastewater network since Victorian times, is well underway. Once complete, it will improve river water quality and the natural environment of the River Clyde and its tributaries, enable the Greater Glasgow area to grow and develop, alleviate sewer flooding key locations and deal with […]

North West Leicestershire District Council’s long term housing proposals include an allocation of 3,200 dwellings to the south east of Coalville. Without sewer capacity improvements the additional flows will increase flood risk and combined sewer overflow (CSO) spills and so proactive capacity improvements are required to meet Severn Trent Water’s AMP6 outcomes to ‘safely take […]

London’s sewerage system was designed by Sir Joseph Bazalgette in the 1850s, for a population of four million people. While the Victorian sewers are still in excellent working condition, they are struggling to cope with the demands of the city’s growth. Every year, tens of millions of tonnes of raw sewage pour into the River […]

As part of the Thames Water (TW) AMP5 programme of works, it was necessary to remove and upgrade condemned platforms within two interlinked penstock chambers on the Low Level No. 1 (LL1) and Low Level No. 2 (LL2) sewers, which are two of the largest and most important in London. The chambers sit beneath a […]

Designing and installing the next generation of submarine outfall pipelines in the North West

Upgrading an ageing combined sewer network and increasing capacity to protect against basement and overland flooding

Providing a sewer connection to a 2,200 property development via a 30m deep shaft in a dense residential area

£2.6m collaboration to solve a long-term flooding problem in a busy suburb of Devon’s largest city

£2.3m project to alleviate foul and surface water sewer flooding

Harrowside Outfall is the first element of the Blackpool South Strategy to further improve the bathing water quality along the Fylde Coast which involves increasing the capacity of the existing sewer network, surface water and maintenance works to the Lennox Gate Pumping Station. The existing Harrowside outfall, built in 1938, has reached the end of […]

Delivering innovation through partnership

Holbeton sewage discharge reductions to Mothecombe Estuary by surface water separation & attenuation of storm flows

Improvements project delivering environmental benefits for the Holywood & Kinnegar areas of North Down and Belfast Lough coastal waters

Attenuation & screening of CSOs & UV disinfection to meet the rBWD for Mothecombe bathing waters

Secondary lining mitigates water ingress providing a structurally competent, durable and smooth bore for the hydraulic performance of the tunnel

An 87m deep/38m diameter pumping shaft to transfer the volume of the Lee Tunnel to Beckton STW

Managing storm flows using the an early warning system moving from ‘just in case’ to ‘just in time’

Part of Southern Water’s £50m programme of improvements to the sewer network in Portsmouth

Delivering upgrades to pumping stations in preparation for legislation change in 2016

Sewer enlargement in Rainworth to alleviate foul and surface water sewer flooding of private properties

New Thames Water 1,200mm diameter trunk sewer enables growth in South Swindon

Innovative thinking and collaborative working to achieve cost beneficial solutions

1,100m3 of offline storage in Farnborough protects 25 properties from hydraulic foul sewer flooding for rainfall events of up to 1 in 30-year return periods

One of Europe’s largest infrastructure projects, the 25km ‘super-sewer’ will tackle sewage discharges into the River Thames

Using specialist and innovative techniques to renovate sewers built in chalk tunnels by the Victorians

Fleet Walk CSOs identified for overflow improvements

Upsizing the existing sewer network, utilising a timber heading tunnel and auger bore to alleviate flooding in Truro

An individual property level construction scheme to reduce the risk of flooding and to provide wider benefits to the downstream sewerage system

Sewer upgrades with surface water separation reduces flood risk to residential properties

rBWD – 1.25km long sea outfall, part of the works to achieve ‘excellent’ bathing water standards for Bridlington beaches

A collaborative approach to find an innovative solution for a new combined sewer river crossing to reduce CSO pollution and property flooding

£10m sewerage improvement programme delivering benefits to North Down coastal bathing waters

An acrylic polymer injection system was utilized in areas of running sand to improve ground conditions

Detailed design and construction of extensive modification works to an existing CSO chamber

Preventing a poor performing CSO asset from spilling with surface water removal schemes and network enhancements

Replacement of approximately 100m of 1,240mm diameter Victorian brick sewer in Chester, working in live flows

Replacement of a failing rising main through an ecologically sensitive and environmentally rich area

A quantum leap in the identification of sewers subject to groundwater infiltration

Integrated catchment planning & smart assets to deliver a sustainable & affordable flood risk management scheme

Using green & grey infrastructure to develop a programme to alleviate flood risk from combined sewers in West London

First time sewerage within the Derbyshire village including gravity sewers and a new RBC treatment plant

A £1.7m requisitioned sewer project serving a 560-property development

London’s deepest sewer – the main TBM drive and tunnel lining

Designing and installing the next generation of submarine outfall pipelines in the North West

Implementing the UK’s first large scale retrofit green infrastructure strategy providing sustainable flood risk management and pollution reduction

£35m upgrade to sewerage network infrastructure on the banks of the River Foyle within the 2013 UK City of Culture

Tangential vortex drop and passive control to eliminate foul pumping station, incorporated in major project to eliminate property flooding

Design and installation of a new sludge transfer main across the River Irwell

Collaboration, innovation and success in the face of adversity

4,500m3 tank to store storm sewage & prevent discharge into the local watercourse during periods of heavy rainfall

Securing long term operational performance and preventing pollution

Addressing the unsatisfactory intermittent discharges from five CSOs as part of the Swansea Bay Strategy

Design of combined storm overflow using a physical scale model

£1.9m of extensive sewer rehabilitation works in the midst of the South West’s flagship holiday destination

A multi-disciplinary wastewater project using BIM in the delivery of project for Northumbrian Water

Provision of a new public sewerage system for 110 properties

Complex wastewater treatment upgrade project to protect the quality of bathing water

Large scale initiative of advance customer communication & stakeholder management is key to success

Renewal of 2.8km, asset life expired, rising main from West Bridgford SPS to Nottingham trunk sewers

Outfall rehabilitation to alleviate pollution in a SSSI and designated shellfish water

Collaboration between agencies to renovate strategic sewer under the M5 motorway in Somerset

Complicated TBM launch to prevent 16m3 of storm water and sewage being discharged annually

An integrated approach to surface water management

Water quality improvement for the River Ribble and the Fylde coast

£1.2m project to renew a strategically important rising main on the Isle of Wight

Dŵr Cymru Welsh Water launches a strategy to identify and reduce sewer pollution

Delivery of a catchment solution using integrated catchment modelling and an efficient all inclusive team approach

Designing and installing the next generation of submarine outfall pipelines in the North West

One of Scottish Water’s flagship environmental projects for the 2010-2015 investment period is completed on time and under budget

£6m Scottish Water project to remove untreated sewage sea outfalls on the Isle of Bute

Replacement sewer reduces potential flooding risk in city suburb

Back to basics approach – understand the problem

Retrofit SuDS used to reduce CSO spills into protected shellfish water

Rehabilitation of sewers, coordinating with four separate contractors to minimize impact on the public

Dŵr Cymru Welsh Water resolve pollution and sewer collapses in Historic Carmarthen

Surface water flood alleviation project in Bournemouth

South West Water Alliance team ‘Innovate to Renovate’ a failing strategic sewer in the heart of Cornwall

London’s largest & deepest shafts to eliminate sewage discharges to the River Lee

New long sea outfall to improve bathing water quality on key Pembrokeshire beach

Replacement of 6km rising main with PE100 across open countryside including lining and no-dig sections

Development of an integrated, partnership approach to the provision of sustainable sewerage

investment to achieve ‘excellent’ bathing water standards

Relocation of the Port Edgar long sea outfall

Strategic project to increase capacity, alleviate the risk of sewer flooding & improve water quality

For the last 150 years, London’s wastewater has been disposed of through an elaborate network of interceptor sewers built by Victorian engineer, Sir Joseph Bazelgette. This system was a single combined stormwater and sewer network, which incorporated over 50 (No.) Combined Sewer Overflows (CSOs) to the River Thames and the River Lee. These overflows were […]

£28m investment to deliver a wastewater solution for Stranraer and the surrounding villages

Investment in Brixton to remove properties from the Sewer Flooding History Database

Creating a cleaner, healthier River Thames – an overview

Close community and supplier liaison to deliver a main sewer repair

£160m project provides modern sewerage system for Belfast

Cardiff East control strategy to low lying flood areas

Foxton Road & Sir Johns Road CSOs – working to deliver innovative solutions

Screening overflows to the River Tyne

Complex flooding mechanisms including river flooding, highway drainage inadequacies and lack of hydraulic capacity in the public sewerage system

Great Yarmouth Flooding Alleviation Project

First time sewerage for 300 properties in Dorset

Sewerage strategy to remove flooding from different sources

£15.4m scheme to provide first time sewerage in Scottish Highlands

Part of the Thames Water’s £400m programme to significantly reduce the number of properties at risk from sewer flooding

Case study detailing the work at Princess Parkway, Rossendale and Wyre Estuary UIDs

Side entry manholes and stop end bends

£65m project improves environment for residents

CSO & overflow pipework removes properties off flood register

Flood alleviation tunnel

South Town Outfalls – “Completing the Jigsaw”

Extensive sewerage upgrade improves NI bathing waters

£4m solution for environmentally sensitive area

Much more than just treading water

Two key CSO overflows that had UID’s within catchment

Trunk sewer duplication – new 250m inverted siphon sewer

Providing modern sewerage system for city

Efficient environmental improvement for newts & humans

Innovative & repeatable design

£2.2m project has environmental benefits for island community

South Street flood prevention scheme

£6.8m provides new wastewater, collection, transfer & treatment

Tunnelling work carried out underneath active residential properties

Customer care & environment concerns key to success

£3.2m scheme focuses on “Hotspots” & “Hawkeye” sensors

First time scheme for rural community

An innovative semi-precast concrete solution

Highly innovative solution for twin 12’’sludge mains replacement

Most complex wastewater & bathing waters scheme in N Ireland

Enhanced productivity tools optimise sewerage improvements

Solving a long standing flooding problem in town centre

£28.5m scheme to solve uCSO problems in sensitive area

CSO & Skerne siphon improvements

£24,000 scheme to make way for new rising main

Repair team win friends despite 6 months disruption

155yr old major city sewer collapsed emergency team restored flow in 3 weeks

£14m urban drainage improvements project for historic town

£5.65m project provides first time sewage treatment

First time system for outstanding natural beauty area

‘No dig’ methods reduced impact on local community

£3.5m treated sewage outfall into Severn Estuary

Part of Welsh Water’s £1.2 billion investment programme

Cooperation & innovation solve double problem

£42m scheme improves environment & eases housing shortage

Increasing water resources in the Lee Valley

£13.88m vacuum sewerage system for two parishes

£28m scheme to remove flooding & pollution risks

Sewer diversion works for Phase 1 EA scheme

Providing sewage facilities for 3 Yorkshire villages

186 intermittent discharges to be improved in K3 period

Major scheme to improve quality of water courses, access areas

£5.5m flood alleviation scheme after 1 in 600 years storm

Dwr Cymru Welsh Water’s biggest flood protection project

£5.8m investment cleans up the sea at popular resort

Overcoming intermittent discharges in difficult urban area

New STW & sewerage for Scots island township

Storm water management in small west coast communities

Lough Mahon Crossing & Ballinure Header Chamber

£4.5m project to end untreated discharge into Firth of Forth

Major planning study for sustainable drainage infrastructure

South West Water invest £5.5m to meet EC Shellfish Directive