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Mott MacDonald Bentley – MMB

Mott MacDonald Bentley (MMB) is a joint venture between JN Bentley (JNB) and global consulting giant Mott MacDonald. It was established in 1999 to provide framework services to water sector clients in AMP3.

Since then the joint venture has gone from strength to strength, winning multiple client and industry awards for quality and innovation. By embracing all elements of programme management, investigation and construction in one organisation, the company provides an integrated, efficient service.

We purposefully set up to deliver long-term programmes of work, with the appreciation that a strategic focus, effective communication and flexibility in different models of working are important to support a trusted relationship with our clients.

Collaboration is therefore central to the way the company operates, with a constant exchange of ideas and information between all members of the team throughout any project. This close level of integration, not only between our design, contract management and site teams, but also with our client partners, sub-contractors and other contract partners, is core to our success.

Towcester WRC (2025)

Addressing issues with storage capacity, flow capacity, phosphorus levels & growth requirements, to maintain the high standard that Anglian Water aspire to achieve

Broadholme WRC (2024)

£35m investment in improving phosphorus removal capabilities and increasing full flow to treatment in north Northamptonshire

Embsay WTW (2024)

Embsay Water Treatment Works is a standalone 24 ML/d water treatment works operated by Yorkshire Water (YW) and located in the Yorkshire Dales National Park, providing clean water to over 15,000 people in Skipton and surrounding areas. The existing works comprises of clarifiers, rapid gravity filters and a chlorine contact tank with associated chemical dosing. […]

Esholt STW (2024)

Fulfilling the Water Industry National Environmental Programme to reduce overall phosphorus in our rivers

Gouthwaite Reservoir (2024)

Delivering the successful design and construction of a large diameter emergency drawdown siphon at one of Yorkshire Water’s largest reservoirs

Lower Gornal STW (2024)

Tertiary treatment upgrades implemented to achieve tightened phosphorus and ammonia consents

Monkmoor STW (2024)

UK’s first large-scale installation of MABR technology to enhance ammonia removal

Mosswood WTW (2024)

Design and construction of a new run to waste system and attenuation lagoon to protect water quality

Newthorpe STW (2024)

Improving sustainability & resilience of sewage treatment in the Erewash Valley

Red Doles CSO (2024)

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 […]

Sluvad WTW (2024)

Removing manganese and iron through the first UK water industry application of jet mixing for coagulant mixing at a water treatment works

Springwell Service Reservoir (2024)

Design and construction of a 43 ML semi-precast concrete reservoir to provide resilience in South Tyneside and Wearside

West Hallington Reservoir (2024)

West Hallington Reservoir is a Northumbrian Water Group (NWG) asset situated 1km to the northeast of the village of Colwell in the Tynedale district of Northumberland. The reservoir was constructed between 1884 and 1890 for Newcastle & Gateshead Water Company for the purpose of municipal water supply. The reservoir was built adjacent to the earlier […]

Witches Oak Raw Water Pumping Station (2024)

Severn Trent’s Green Recovery Programme: combining natural solutions with conventional infrastructure

Witches Oak WTW: Green Recovery - Decarbonising Water Resources (2024)

The challenges of designing and constructing the Witches Oak programme of works on multiple sites to a condensed timescale

Anglian Water's Strategic Pipeline Alliance: Norwich to Wymondham Pipeline (2023)

Anglian Water’s Strategic Pipeline Alliance (SPA) is delivering one of the largest infrastructure projects in AMP7; a new water main network, hundreds of kilometres long, which will allow Anglian Water to move water around the region from areas of surplus to areas of deficit, future-proofing supply to customers. The network is being constructed in 11 […]

Chilton Foliat STW Flow Compliance (2023)

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 […]

Lluest Wen Reservoir (2023)

Located near Maerdy in South Wales, Lluest Wen Reservoir is a Category A Large Raised Reservoir as defined by the Reservoirs Act 1975. The reservoir is impounded by a 200m long, 25m high earth embankment dam across the Rhondda Fach River and currently impounds 1.07Mm3 of water. Construction of the reservoir was originally completed in […]

Lower Barden Reservoir (2023)

Lower Barden Reservoir is the lower of two reservoirs located near Bolton Abbey within the Yorkshire Dales National Park. The reservoir is an impounding reservoir with a crest length of approximately 640m and a maximum height of 28m with a capacity of 2.23 Mm3. The overflow is located on the right-hand side of the embankment […]

Newthorpe STW (2023)

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 […]

Ovingham Raw Water Pumping Station (2023)

Northumbrian Water’s Ovingham Raw Water Pumping Station (RWPS) is an abstraction station located on the north bank of the River Tyne in South Northumberland between the towns of Wylam and Ovingham. The station provides raw water from the River Tyne to Horsley Water Treatment Works (WTW) and the Great Southern Reservoir at Whittle Dene WTW. […]

Roundhill & Lower Gornal STWs (2023)

Roundhill Sewage Treatment Works (STW) is a large wastewater treatment site in the Severn Trent region serving Stourbridge and the surrounding area. It treats a flow to full treatment (FFT) of 1781 l/s and a population equivalent (PE) of around 300,000. The works was extensively rebuilt around the year 2000, with the large rectangular biofilters […]

Tees & Central Strategic Pipeline: Phases 1 & 2 (2023)

With approximately 60km of new 800/900mm pipeline required to replace the existing potable water mains, some of which are over 150 years old, the Tees and Central Strategic Pipeline will directly improve water quality, network resilience and operability within the Tees Network. The pipeline will serve approximately 50,000 properties and link a number of strategic […]

Ufton Nervet WTW (2023)

Ufton Nervet WTW is a groundwater treatment site located in the Kennet Valley Water Resource Zone, to the south of Reading and supplies an ‘island zone’ of approximately 12,000 properties. Groundwater is pumped through pressure filters for iron removal after which chlorine is dosed before flows enter the contact tank, which is a single cell […]

Usk Reservoir (2023)

Usk is a large raised reservoir formed by an earth embankment dam, which completed constructed in 1955 with an approximate capacity of 12,268,000m3. The dam is 480m in length, with a maximum height of 31m, and supplies raw water to Bryngwyn Water Treatment Works and as well as providing compensation water to the River Usk, […]

Witches Oak WTW: Green Recovery - Decarbonising Water Resources (2023)

In the summer of 2020, the water industry was set a challenge by its regulators to identify ways to support the country’s green economic recovery from Covid-19. Severn Trent responded with a number of proposed programmes, including Decarbonising Water Resources (DWR), the subject of this paper. The objective of the DWR programme was to provide […]

Wooler WTW (2023)

Wooler Water Treatment Works (WTW) is fed by four boreholes and supplies up to 160m3/hour of potable water to Wooler and surrounding areas, including several tourist and semi-residential holiday parks serving over 5,000 people. Seasonal fluctuation in demand can increase turbidity and increase iron and manganese concentrations in the borehole water, particularly when flows are […]

Anglian Water’s Strategic Pipeline Alliance (2022)

While the east of England is attracting people like no other part of the UK, it is also the driest area of the country – a threat to its success that Anglian Water is determined to overcome. The Strategic Pipeline Alliance (SPA) comprises, Farrans, Mott MacDonald Bentley, Costain and Jacobs, who are delivering one of […]

Buxton STW (2022)

Improving phosphorus performance and providing treatment resilience using preliminary and primary treatment for an existing MBR on a space constrained site

Enhanced Biological Phosphorus Removal Programe (2022)

As part of the capital investment programme for the years 2020 to 2025 (AMP7), Yorkshire Water Services (YWS) set out to deliver a programme to comply with new regulatory obligations on phosphorus (P) standards (Water Industry National Environment Programme – WINEP) while ‘greening’ their approach to wastewater treatment by prioritising solutions with lowest whole life […]

Haxey-Graizlound STW (2022)

Located in Lincolnshire east of Doncaster, Severn Trent’s Haxey-Graizlound Sewage Treatment Works (STW) serves a residential population equivalent of 5,169 with no trade loads within the catchment. The works receives pumped flows from two pumping stations located in the catchment. The present permit is BOD 25mg/l, suspended solids 45mg/l, ammonia 15mg/l with a dry weather […]

Mosswood & Lumley WTWs (2022)

Northumbrian Water Group (NWG) have recently upgraded their clean water treatment processes at Mosswood and Lumley Water Treatment Works (WTWs). This was to increase quality and resilience of customers’ water supplies by adding ultraviolet (UV) irradiation as an extra barrier of protection. The main innovation of these projects was that they provided a vastly more […]

Pant-Yr-Eos Reservoir (2022)

Pant-yr-Eos is a large raised reservoir situated approximately 2km east of Risca in the City of Newport, Monmouthshire. It is impounded by a 27m high, 280m long embankment dam with clay core, and has a storage capacity of approximately 600 Ml. The reservoir was completed in 1878 for provision of water supplies to Newport. To […]

Riding Mill Raw Water Pumping Station (2022)

When constructed in 1979, as part of the Kielder Transfer Scheme, Riding Mill Pumping Station was the largest pumping station in Britain. Abstracting flows from the River Tyne, it enables Northumbrian Water (NWG) to transfer water from Kielder Reservoir to the Derwent, Wear and Tees rivers, whilst supporting the operation of Mosswood WTW. The site […]

Rothbury STW (2022)

Rothbury Sewage Treatment Works is an unmanned Northumbrian Water site located 13 miles north-west of Morpeth, Northumberland. It is on the western valley slope of the River Coquet, a designated Site of Special Scientific Interest. The area is a popular year-round holiday destination with several caravan sites within the catchment. The original works dates from […]

Roundhay Park Lane CSO (2022)

The project is located within the residential area of Roundhay in north Leeds, less than 500m from the city’s largest park. The immediate area’s combined system serves in excess of 1900 residential properties and ultimately feeds into the wider Leeds city combined system via Roundhay Park Lane Combined Sewer Overflow (CSO). Hydraulic and water quality […]

Stoke Bardolph STW - Anaerobic Digestion (2022)

Stoke Bardolph Sewage Treatment Works (STW) is Severn Trent’s second largest STW and serves a population of c. 620,000. The site is also a major regional sludge centre, meaning it takes a high volume of sludge imports from other sites in the region. Stoke Bardolph has a sludge treatment capacity equivalent to a population of […]

Swinsty Impounding Reservoir (2022)

Swinsty Reservoir is the third in a cascade of four impounding reservoirs in the Washburn Valley, North Yorkshire. The reservoir is impounded by a 490m long, 24m high earth-fill embankment dam with a central puddle clay core, storing 3.94 million cubic metres at top water level. The overflow is located on the right-hand side (RHS) […]

United Utilities Filtration System Replacement (2022)

In May 2018 United Utilities appointed Mott MacDonald Bentley (MMB) to deliver an NEC Option A design and construct project for the upgrade of one of their water treatment works (WTW) in the northwest of England. The project scope comprised upgrade of several key treatment processes to ensure compliance with Badenoch and Bouchier performance recommendations […]

Ynys-y-Fro Lower Reservoir (2022)

The Ynys-y-Fro Reservoir system is situated 1km north-east of High Cross, Newport. The system comprises two reservoirs in cascade: an upper ‘subsiding’ reservoir and a lower ‘old pond’ reservoir. The upper reservoir is immediately upstream of the lower reservoir. The lower reservoir was constructed as an earth embankment dam and was built for the supply […]

Dolwen Reservoir (2021)

Dolwen Reservoir is a Category A Large Raised Reservoir as defined under the Reservoirs Act 1975. It is located on a tributary of the River Elwy, 0.7km upstream and north of Plas Uchaf Reservoir, near Abergele, Conwy, Wales. It was constructed in 1905 and has a capacity of approximately 288,185m3. Dŵr Cymru Welsh Water commissioned […]

Haweswater Aqueduct, Hallbank Tunnel Replacement (2021)

The Haweswater Aqueduct (HA) was constructed by the Manchester Water Corporation between 1935 and 1955 to provide water from Haweswater Reservoir to Heaton Park Reservoir in Manchester. The aqueduct was initially designed to convey 105 million gallons per day to allow for future increase in demand and is constructed of 8’ 6” concrete lined tunnels […]

Hayfield & Barton WwTWs (2021)

In recent years, phosphorus discharge limits have been tightened to improve the surface water quality, particularly to address eutrophication issues. Before 2015, only a small number of sites in the UK had a total phosphorus (TP) permit as low as 1 mg/l under the Habitats Directive. Since then, TP permits have been continuously tightened in order to achieve […]

Hull WwTW - Project Update (2021)

Located in Saltend, Yorkshire Water’s Hull WwTW provides sewage treatment for a population equivalent of over 1 million people, covering an area from the west of Hull to Hedon in the east. This case study follows on from an initial paper in 2020 and details the progress of the new inlet works and the refurbishment […]

Lletty Brongu & Ruthin STWs (2021)

Welsh Water raised a programme of quality schemes for completion in AMP6 to address tightening of phosphorus permits set by Natural Resources Wales (NRW) at ten wastewater treatment works. Some of the sites in the programme were subject to a new total phosphorus (TP) permit of 0.5 mg/l T-P and required the installation of a […]

Maerdy WTW (2021)

Maerdy Water Treatment Works (WTW) is located 35km north of Cardiff, supplying up to 16Ml/d potable water to customers in Ferndale and the surrounding area. Raw water is gravity fed from Castell Nos and Lluest-Wen Reservoirs and the quality can be highly variable, particularly following heavy rainfall resulting in a challenge to WTW performance. In […]

Mosswood WTW (2021)

Northumbrian Water (NWL) provides water supply and sewerage services to a population of 2.7 million in the north east and 1.8 million in the south east of England, delivering 1,100 MLD of drinking water. Potable water treatment works vary from small groundwater sources to large surface water treatment facilities such as Mosswood Water Treatment Works […]

Poolend Borehole Capital Maintenance (2021)

Severn Trent’s existing Poolend Borehole Pumping Station is located near Leek in Staffordshire and is one of four sources that supply water to Ladderedge DSR. A second borehole source feeds into the Poolend site where both sources undergo water treatment (pH correction, plumbosolvency, marginal chlorination, and ultraviolet (UV)). To ensure continued water security in the […]

Service Reservoir Isolation Programme (2021)

In 2016, United Utilities was issued with a Service Reservoir Cleaning notice by the Drinking Water Inspectorate (DWI) as part of the Company transformation programme. Inspecting, cleaning and maintaining the reservoirs first required a batch of projects to provide the facility to isolate five existing service reservoirs (SRs) from the water network, whilst maintaining supply […]

Uckington Water Treatment Scheme (2021)

The Uckington Borehole Capital Maintenance (BCM) and Restoring Sustainable Abstraction (RSA) Treatment Project set out to achieve the goal of an ecological improvement of the River Worfe while safeguarding the public water supply to the Telford area network. Over-abstraction from the River Worfe was impacting the achievement of Good Ecological Status under the Water Framework […]

Whitlingham Water Recycling Centre (2021)

Investment in Whitlingham WRC was identified by Anglian Water to ensure that the site remains resilient for Norwich’s growing population and support the environment of the River Yare; part of the Norfolk Broads. A full review of the existing assets and support to carry out on-site testing to understand the process limitations, identified potential opportunities […]

Bewdley Bank Service Reservoir (2020)

The Hereford Water Network is dependent on a single source of supply from the River Wye and Dŵr Cymru Welsh Water identified a need to assess the resilience of the network to maintain customer supply during any future loss of source supply events. The resulting hydraulic assessment identified the requirement to increase the available storage […]

Hookstone Road CSO (2020)

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 […]

Hull WwTW (2020)

Hull WwTW located at Saltend, east of Hull, provides sewage treatment for a population equivalent of over 1 million people, covering an area from the west of Hull to Hedon in the east. The existing treatment works was built over 20 years ago and required some specific upgrading and refurbishment. The primary drivers for the […]

LED UV Water Treatment (2020)

United Utilities’ (UU) vision is to be a leading north west service provider, and one of the best UK water and wastewater companies. It is a challenging vision, but one United Utilities are capable of achieving by focusing on three objectives to deliver the best service to customers, at the lowest sustainable cost and in […]

Llyn Brenig Reservoir (2020)

Llyn Brenig impounding reservoir is located in the Denbigh Moors in North Wales. It was constructed in 1975 and was officially opened by the Prince of Wales. It forms part of the River Dee regulation to manage flow into the Dee via the Afon Alwen. The reservoir has a capacity of around 60 million cubic […]

Murton WTW (2020)

Murton WTW is fed by six boreholes and supplies up to 350m3/hour of potable water to Berwick-upon-Tweed and surrounding areas, serving over 7,500 properties. The boreholes which feed the Berwick Water Supply Zone can contain turbidity, particularly when flows are high, interrupted or varied. The existing treatment process was unable to remove the turbidity, causing […]

Codsall STW (2019)

Severn Trent (ST) and Hafren Dyfrdwy (HD) have been challenged to meet a large number of new, tight phosphorus permits as a result of the Water Framework Directive (WFD). Historically, only Total-P levels down to 1 mg/l have been enforced by the Environment Agency, but in AMP6 and AMP7 a big step change in expectations […]

Cotherstone Pipe Bridge & Mains Refurbishment (2019)

Balder Pipe Bridge spans the River Balder in Cotherstone Village near Barnard Castle, County Durham. The bridge abutments occupy private land on either side of the bridge with a public footpath running past the south abutment. The bridge was original designed to carry a single 24” cast iron raw water main which supplies Lartington Water […]

Flass Vale (Durham) Sewerage Scheme (2019)

Flass Vale is an area of woodland to the northwest of Durham City Centre that extends north-west to Durham Johnston School and the A167. Flass Burn flows generally north-west to south-east through the Vale. The Burn is an open ditch in the northwest and is culverted in the southeast including through a former bus depot […]

Goscote STW (2019)

Goscote STW is an activated sludge process (ASP) works located near Walsall in the West Midlands which serves a population equivalent (PE) of 120,806 (including trade). The site discharges into the River Tame catchment. Its upgrade was key to meet a tighter environmental permit in AMP6, being 10 mg/l BOD, 1.3 mg/l ammonia and 0.2 […]

Pegswood STW (2019)

Pegswood Sewage Treatment Works (STW) is a Northumbrian Water (NW) site located 16 miles north of Newcastle-upon-Tyne and 2 miles north-east of Morpeth, Northumberland. The treatment process comprised inlet screens, flow control and storm separation to storm tanks, two Dortmund pyramidal settlement tanks, four biological percolating filters, with a circular humus tank discharging final effluent […]

Renny’s Lane Foul Sewer Rising Main Replacement (2019)

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 […]

Seaham STW - Inlet Works Upgrade (2019)

Seaham Sewage Treatment Works (STW) receives and treats raw sewage from Seaham and the surrounding area. Constructed in phases between 1996 and 2001, the works serve a population of over 23,000 people. The works were originally built to ensure compliance with the Bathing Water Directive, as the site discharges directly into the North Sea via […]

Stocksbridge WwTW (2019)

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 […]

Warland Impounding Reservoir (2019)

Warland Impounding Reservoir (IR) is situated on the western slope of Blake Moor, above Littleborough, Lancashire. The reservoir was originally constructed around 1857 by the Rochdale Canal Company to maintain water levels in the Rochdale canal, and was considered to be one of the largest dams in England at the time. It has a 1500m […]

Audley Borehole Pumping Station (2018)

Audley Borehole Pumping Station is one of Severn Trent Water’s (STW) borehole capital maintenance projects which supports the Peckforton Group in supplying potable water to Coopers Green Reservoir. As part of the £3m scheme, the project focuses on delivering resilience from Audley to maintain high quality water supply to the people in Staffordshire. Audley is […]

Blackpool South Surface Water Strategy (2018)

The Blackpool South Surface Water Strategy is a £30m scheme aimed at improving bathing water quality along Blackpool’s golden mile. The project tackles the combined challenges of climate change, an aging Victorian sewer network, increasing urbanisation and a responsive catchment. The project’s objectives are the reduction in frequency and quality improvement of spills within the […]

Cowleigh Distribution Service Reservoir & Lower Wyche Pipeline (2018)

Cowleigh Distribution Service Reservoir (DSR) and Lower Wyche DSR are located to the north and south of Great Malvern, Worcestershire and are overlooked by the Malvern Hills. Cowleigh DSR receives water from Powick Pumping Station and the Southern Strategic Main, whilst Lower Wyche DSR receives water from Bromsberrow WTW which is borehole site. Severn Trent […]

East Tanfield STW (2018)

East Tanfield Sewage Treatment Works (STW) is a Northumbrian Water Group (NWG) site located 11 miles north-west of the City of Durham and 9 miles south-west of Newcastle-upon-Tyne. It consists of two distinct sites: a ‘lower’ site comprising a terminal pumping station (TPS) with emergency storage tanks adjacent to the Houghwell Burn watercourse; and an […]

Gouthwaite Impounding Reservoir (2018)

Built under the Bradford Corporation Waterworks Act 1890, Gouthwaite Impounding Reservoir (IRE) forms the lowest of a cascade of three reservoirs in Upper Nidderdale, all designed by their chief waterworks engineer. The upper two reservoirs, Angram and Scar House, supply water along the Nidd Aqueduct to Bradford. Gouthwaite IRE was built 11km downstream to provide […]

Hanchurch Service Reservoir (2018)

A ‘product-based’ approach to service reservoir construction is revolutionising the way MMB are constructing a new multi-million-pound distribution service reservoir (DSR) for Severn Trent Water (STW). To boost productivity in the construction process, the new 43ML reservoir is being treated as a ‘product’, manufactured largely off site in controlled-conditions, before being assembled on site near […]

Lumley Raw Water Pumping Station (2018)

The installation of new eel and fish friendly screens at Northumbrian Water Group’s (NWG) Lumley Raw Water Pumping Station (RWPS) was the culmination of collaborative working between multiple stakeholders, to transform the screening methodology in an environmentally sensitive location. The final solution provides an option that presents immediate environmental benefits to aquatic life, with low […]

Manganese North (2018)

Between 2007 and 2014 two of Northumbrian Water’s (NWG) water supply zones, served by Whittle Dene WTW and Warkworth WTW, both in Northumberland, consistently received the highest number of water quality contacts for discoloured water. In previous AMP periods, NWG undertook a programme of strategic mains cleaning and unidirectional flushing to improve customer acceptability performance. […]

North Wales Sludge Strategy & Five Fords AAD (2018)

Welsh Water set out its vision in its Sewage Sludge Strategy 2040 how it intended to deal with the number one waste management challenge all water utility providers face, the sustainable management and disposal of wastewater sludges. With ever tightening nutrient and heavy metal limits on agricultural usage, and more pressure than ever for companies […]

Preston WwTW (2018)

Preston WwTW serves a population in excess of 250,000 and has six sub-catchments: Lytham, Fairhaven and Freckleton within the Fylde District to the west, Lea Gate and Watery Lane to the east within the Borough of Preston and Penwortham to the southwest within the South Ribble District. United Utilities (UU) has invested £20m during AMP6 […]

Rivelin WTW - Sirofloc Replacement: Part 2 (2018)

Yorkshire Water Services (YWS) committed to the Drinking Water Inspectorate’s (DWI) compliance date of 31 December 2017 for beneficial completion of a new clarification process at Rivelin WTW. The £25m scheme required the design and construction of a large 82.5MLD buried treatment plant (80m long, 40m wide and 14m high) on the border of the […]

Station Road (Queensbury) Sewer Flooding (2018)

Mott MacDonald Bentley (MMB) carried out an investigation for Yorkshire Water Services into the flooding of five properties in Queensbury in West Yorkshire during periods of heavy rainfall. The investigation concluded that the combined sewer system in the residential cul-de-sac had insufficient capacity during a 1 in 10-year storm return event, resulting in overland flow […]

Upper Chelburn Impounding Reservoir (2018)

Upper Chelburn Impounding Reservoir (IR), located near Rochdale on the east Lancashire moors, is owned and operated by United Utilities (UU), providing compensation water to the nearby Rochdale canal. The reservoir is impounded by northern and southern earth-fill embankments (Figure 1), with a resulting capacity of 236,000m3. The 16.5m high northern embankment was constructed between […]

Usk Spillway Upgrade (2018)

Usk Reservoir in Brecon is situated south east of Llandovery and approximately 5km to the west of Sennybridge. The reservoir is an existing 12.3Mm3 reservoir in the Brecon Beacons National Park in South Wales. It is impounded by a 31m high, 480m long embankment dam with a clay core, which was constructed in 1955. The […]

Woodgate Hill Service Reservoir No. 2 (2018)

Woodgate Hill Service Reservoir No. 2 (SR2) was commissioned in 1963, providing a total capacity of 269Ml and a throughput that equates to 20% of the regional water demand. The reservoir was built in to the hillside with an excavation of around 380,000m3. With a footprint of 47,000m2, at the time of construction, Woodgate Hill […]

Butterley Spillway Improvements Works (2017)

Yorkshire Water’s Butterley Reservoir is located in the Wessenden Valley, West Yorkshire, with construction completed in 1906. The reservoir dam has a puddle clay core and a spillway constructed with local traditional stone. Due to fissures in the surrounding rock, leakages around the dam were experienced during the original commissioning phase, leading to a longer […]

DCWW Coastal Investigations Programme (2017)

In March 2015 Dŵr Cymru Welsh Water (DCWW) launched the biggest Welsh coastal investigation and modelling project ever undertaken to enhance its understanding of the factors affecting water quality at 49 sites (29 bathing waters and 20 shellfish waters) along the entire Welsh coastline. The evidence gathered from this study will allow DCWW to assess […]

Digley IRE Valve Tower Metalwork Replacement (2017)

Digley Impounding Reservoir (IRE) is located in Holmbridge, Huddersfield. The valve tower associated with the reservoir had corroded access metalwork which did not meet current health and safety standards. The project replaced all the corroded access metalwork within the valve tower with new Yorkshire Water Asset Standard compliant metalwork, improving safe access within the tower. […]

Flamborough Head Sewage Pumping Station (2017)

The Flamborough Head Sewage Pumping Station (SPS) is located close to a scheduled monument, a Site of Special Scientific Interest, within a local nature reserve, adjacent to a Special Area of Conservation and Special Protection Area and is home to guillemots, puffins, dolphins and porpoises. The area is also a major tourist attraction, enticing thousands […]

Masonry Reservoir Spillway Refurbishment (2017)

The innovative use of a spray applied structural concrete ‘shotcrete’ lining is a cost and programme effective alternative to ‘traditional’ in situ or precast concrete repair, or re-construction of masonry reservoir spillways. This construction methodology was used successfully across three masonry spillways of varying geometries to prolong the operational life of the ageing structures, whilst […]

Northumbrian Water Wastewater Minor Works Programme (2017)

Mott MacDonald Bentley (MMB) has been delivering the Wastewater Minor Works sub-programme for the Northumbrian Water Group (NWG) since 2006 with the number of schemes delivered annually increasing year-on-year. The team must deliver schemes for less than £150,000, and are targeted at maintaining wastewater compliance. The projects are batched where practicable, and estimated efficiencies in […]

Poolend & Highgate pH Correction & Plumbosolvency (2017)

The £2.25m Poolend and Highate pH Correction and Plumbosolvency Scheme required the design and construction of a 20Ml/d treatment plant. Poolend BPS is located near Leek in Staffordshire. Water from Poolend and Highgate is blended with water from other sources and supplies thousands of properties across Staffordshire. The successful completion of the scheme by design […]

Severn Trent DG2 Small Pumps Project (2017)

DG2 (Director General 2) is a status where, according to Ofwat, a customer receives inadequate water pressure generally under 1bar at their point of connection to the water main. Water companies are subject to annual regulatory fines for properties on the DG2 register above a threshold. Severn Trent Water arranges its distribution to cater for […]

Springs Impounding Reservoir (2017)

United Utilities (UU) is the statutory undertaker for 132 impounding reservoirs (IRs) retained by earth-fill embankment dams which fall under the requirements of the 1975 Reservoir Act. Before the era of ‘Pennine’ type clay core construction techniques, many impounding reservoirs that were constructed around the turn of the nineteenth century were substantially homogenous, comprising of […]

United Utilities CIP2 & P1 Trials (2017)

Under the Water Framework Directive (WFD) all water environments in the UK must meet ‘Good Chemical Status’ for a number of chemicals. The chemicals cover a range of over 70 substances (often referred to generically as priority substances) including metals, pharmaceuticals, combustion products and regular sanitary determinands (including phosphorus). The Environment Agency instigated a national […]

Wallgrange Solvents and pH Improvements (2017)

The £3.3m Wallgrange Solvents and pH Improvements Scheme required the replacement of two existing borehole pumps and the design and construction of a water treatment works sized to treat 20ML/day. The installation of this treatment works has directly addressed a number of water quality issues and has delivered a more resilient supply to thousands of […]

Blymhill STW (2016)

Blymhill STW is a small rural RBC and reed bed STW based in south Staffordshire which treats flows from a PE of about 551. This was set to increase to a design population of 844 PE due to predicted non-residential domestic load. The catchment consists of several individual villages, plus the non-domestic contribution from Weston […]

Bryn Cowlyd WTW (2016)

Welsh Water’s Bryn Cowlyd Water Treatment Works (WTW) is located near Dolgarrog village in the Conwy Valley. The site sits on the eastern side of the Carneddau mountain range on the outskirts of Snowdonia National Park. The existing works on the site was commissioned in 1998 and can deliver up to 46Ml/d of clean water […]

Grafham WTW Resilience (2016)

Grafham WTW is located near Huntingdon and serves a population of 829,000, including Northampton, Huntingdon and Bedford. It is estimated that approximately 614,000 of these would be affected by a major outage at Grafham WTW. As part of Anglian Water’s AMP5 Final Business Plan programme, the Grafham WTW Resilience scheme was identified to mitigate the […]

Jackson’s Edge Service Reservoir - Compartment 1 (2016)

Jackson’s Edge Service Reservoir (SR) is a water supply scheme that will provide increased security to the network through the provision of a new 18Ml capacity, twin compartment SR on the site of the existing 103 year old SR. The £7.5m project has adopted a Design for Manufacture and Assembly (DfMA) approach, saving approximately £2m […]

Llandinam Resilience Scheme (2016)

The £2.9m Llandinam Resilience Scheme required the design and construction of a 20,000m3/day treatment plant which can be brought online reliably within 6 hours of detecting a significant failure of the existing treatment stream. The successful completion of the scheme by design and build contractor Mott MacDonald Bentley (MMB) on behalf of Severn Trent Water, […]

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Water Pumping Stations: Contractors | Tier 1 Contractors

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