Supply Chain - Stormwater Storage - Above-ground Storage Tanks
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Related Content
Case Studies
- Brook Street (Dawlish) CSO (2023)
- Boherbue Wastewater Treatment Plant (2024)
- Burnley WwTW Catchment Strategy (2024)
- Glenboi Flood Alleviation Project (2023)
- Ballina Wastewater Treatment Plant (2024)
- WINEP Durham Transfers (2024)
- Tideway Central - Victoria Embankment (2024)
- Southampton Shellfish Scheme (2024)
- Ards North Wastewater Improvement Scheme (2023)
- Offwell Storm Tank (2024)
- Marhamchurch SPS (2023)
- Sherston S101a - First Time Sewerage Scheme (2023)
- Ballyronan WwTW (2024)
- Marchmont Road Flood Alleviation Scheme (2024)
- Hawkchurch STW (2024)
- Galmpton Catchment (2024)
(left) Flow control chamber showing overflow weir and Hydro-Brake® and (right) looking down into the 30m3 stormwater tank showing the float controls, pump, pump guides and sump - Courtesy of Galliford Try[/caption]
(left) All weather kiosk constructed off-site, containing the alarms, telemetry, pump return and mains in-comer and (right) access cover within the Manor House Car Park into the 30m3 stormwater tank all completed day before handover - Courtesy of Galliford Try[/caption]
Completed car park area day before handback - Courtesy of Galliford Try[/caption]
Google Earth image of Boherbue[/caption]
Inlet works preliminary treatment - Courtesy of Glanua[/caption]
Secondary aeration treatment - Courtesy of Glanua[/caption]
Cloth filter tertiary treatment - Courtesy of Glanua[/caption]
Sludge drying reed beds to process wastewater sludge naturally - Courtesy of Glanua[/caption]
Solar panels for clean, renewable energy - Courtesy of Glanua[/caption]
(left) Precast concrete aeration tanks reduced construction time and safety risks and (right) view of final clarifiers and cloth filters - Courtesy of Glanua[/caption]
Off-site fabrication of steel building, fully assembled as works have been completed (April 2024) - Courtesy of Glanua[/caption]
Activated sludge plant, interstage pumping station and blower building - Courtesy of United Utilities & Advance-plus[/caption]
BioMAg Magdrums - Courtesy of United Utilities & Advance-plus[/caption]
Burnley WwTW: ASP plant - Courtesy of United Utilities & Advance-plus[/caption]
Detention tank and pumping station - Courtesy of United Utilities & Advance-plus[/caption]
Sludge thickening area- Courtesy of United Utilities & Advance-plus[/caption]
Burnley STW: Chemical dosing area - Courtesy of United Utilities & Advance-plus[/caption]
Interstage pumping station and BioMag & blower buildings - Courtesy of United Utilities & Advance-plus[/caption]
Lindred Road detention tank during construction - Courtesy of United Utilities & Advance-plus[/caption]
Burnley WwTW: Odour control cover for PST4 from Corporate Engineering - Courtesy of United Utilities & Advance-plus[/caption]
Detention tank on water test - Courtesy of United Utilities & Advance-plus[/caption]
(left) Pipework within the shaft and (right) precast concrete segmental shaft rings - Courtesy of envolve infrastructure[/caption]
ECI was integral to the final design solution from the outset, close collaboration with Rhondda Cynon Taf developed a more efficient and reduced cost engineering solution to meet the project objectives, providing a cost-effective and value driven solution. ECI began with a partnership with Hydrock developing the detailed design. Envolve’s ECI strategy was to further investigate and interrogate the outline design, whilst minimising risk and embodied carbon through streamlining constructability and increasing operational efficiency.
The design and delivery team undertook a review of the design philosophy in tandem with Rhondda Cynon Taf’s conceptual design. A proposal was drawn up, identifying the benefits of a deeper wet well shaft in lieu of a smaller shaft with accompanying storage tank. This approach mitigated the requirement for a reinforced concrete retaining wall adjacent to the existing highway.
Further investigation into the most efficient shaft construction identified the benefits of constructing a ‘wet’ cassion, in lieu of a conventional ‘dry’ construction. This construction method mitigated potential subsidence risk to 7 local residential properties and the main B4275 carriage way as there would no longer be a requirement to lower the existing high water table by our selected engineering solution.
In enlarging the proposed shaft, envolve was also able to house the proposed pumping equipment within the shaft itself, significantly reducing the overall footprint of the facility.
The final visual impact of the project was prioritised to provide adjacent residents with the least impactful and sustainable reinstatement on completion of the project. In lieu of a large tarmac area, a sustainable permeable hard standing was specified.
On site ECI works undertook ground investigation to determine the classification of waste material for excavation arisings including sampling and laboratory testing.
Envolve’s design solution successfully met Rhondda Cynon Taf’s requirement for a 250m3 storage tank with an outflow of 200 litres per second, achieved via a 6m diameter and 11m deep shaft with incorporated pumping station, all within the minimal footprint of the land available.
This significant design improvement ensured the final engineering solution worked within the site boundaries, also providing Rhondda Cynon Taf with an £800k cost saving for the overall project.
In summary, the outputs of our ECI expertise resulted in the following improvements to the final project design:
(left) Birdseye view of the wet caisson shaft under construction and (right) precast concrete segmental shaft rings at the base of the shaft - Courtesy of envolve infrastructure[/caption]
Birdseye view of the construction site - Courtesy of envolve infrastructure[/caption]
Completed shaft and cover slab - Courtesy of envolve infrastructure[/caption]
School visit to site from Glenboi Primary School and the footpaths and outdoor learning facilities - Courtesy of envolve infrastructure[/caption]
Following this, further support was provided to the school with the offer to complete their woodland walk and outdoor learning facility with accessible footpaths connecting the outdoor classrooms. A prestigious opening ceremony was hosted by the school for the grand opening with fantastic poems and songs performed by the pupils – there was even a special cake baked in appreciation of the relationship envolve developed with the school over the lifetime of the project. The woodland learning facility will hopefully provide years of outdoor learning opportunities for the school and its pupils.
Envolve operate a successful apprenticeship programme which sees a handful of placements throughout the business each year, these roles span from Commercial through to Engineering. This project presented a unique opportunity for an Engineering placement and a person from the programme was allocated to the project for its duration as part of their development plan.
Construction work underway at Ballina - Courtesy of Shay Murtagh Precast[/caption]
New inlet works under construction - Courtesy of Ward & Burke[/caption]
New final settlement tank under construction - Courtesy of Ward & Burke[/caption]
Scope of works (continued)
New storm water tank under construction - Courtesy of Ward & Burke[/caption]
New outfall under construction - Courtesy of Ward & Burke[/caption]
Piling operations by Francis & Lewis International Ltd, for the construction of the pipe bridge substructure - Courtesy of Esh-Stantec[/caption]
Active Tunnelling constructing the new wet well shaft at Pity Me STW
Construction of new valve chamber and associated pipework at Pity Me STW - Courtesy of Esh-Stantec[/caption]
Aerial view of working area at Brasside STW - Courtesy of Esh-Stantec[/caption]
Construction of pipe bridge structure by Francis & Lewis International Ltd - Courtesy of Esh-Stantec[/caption]
(left) Works within the cofferdam in the Thames and (right) works ongoing within the cofferdam - Courtesy of Barhale[/caption]
Secondary lining works - Courtesy of Barhale[/caption]
(left) Commencement of shaft works, and (right) diversion works within Victoria Embankment -Courtesy of Barhale[/caption]
UV irradiation system at Slowhill Copse WwTW (December 2023) - Courtesy of Southern Water[/caption]
UV irradiation system at Millbrook (May 2023) - Courtesy of Southern Water[/caption]
Storm Shaft in Ashlett Creek (June 2024) - Courtesy of Southern Water[/caption]
Refurbishment of redundant storm tanks at Millbrook to provide 3,400m3 capacity - Courtesy of Southern Water[/caption]
Construction of the shaft at Woolston - Courtesy of Southern Water[/caption]
UV irradiation system at Millbrook (June 2024) post commissioning/FST under construction and (inset) UV irradiation system at Slowhill Copse WwTW - Courtesy of Southern Water[/caption]
(left) Millbrook UV pumping station and (right) MBR cassette capacity being increased in Woolston WwTW - Courtesy of Southern Water[/caption]
Landscaping over Woolston storm shaft - Courtesy of Southern Water[/caption]
Bulk excavation - Courtesy of BSG Civil Engineering Ltd[/caption]
Ards North WwTW - Inlet works overview - Courtesy of BSG Civil Engineering Ltd[/caption]
Inlet works side view - Courtesy of BSG Civil Engineering Ltd[/caption]
Screened raw sewage continues to the grit removal plant. The grit settles in a sump underneath the grit paddle. Any grit that settles in this sump is periodically aerated using the grit blower and then removed. From here the grit is transported out of the grit plant by the grit classifier and is deposited into the grit skip. From here it is removed off site for disposal.
After the wastewater has passed through the grit removal plant, flow continues to the FFT pumping station. Here influent is collected, and FFT of 48.2 l/s (summer) & 29.6 l/s (winter) is pumped to the PST flow splitting chamber.
(left) Ards North WwTW - Courtesy of NI Water, and (right) storm tanks tipping bucket installation - Courtesy of BSG Civil Engineering Ltd[/caption]
Aeration plant air manifold control valves and instrumentation - Courtesy of BSG Civil Engineering Ltd[/caption]
RAS/SAS pumping station - Courtesy of BSG Civil Engineering Ltd[/caption]
The thin sludge tank is equipped with an external mixer for the blending of the tank’s contents to feed the sludge thickening plant. A level ultrasonic with low and high-level floats are used in the control of the mixer.
Mixed sludge from the thin sludge tank is pumped to the sludge thickening plant via the two thickeners feed pumps. These pumps are progressive cavity pumps and are arranged in duty/standby configuration. The pumps are VSD controlled to allow the flow to the thickening plant to be controlled.
There are two sludge thickeners, with an individual throughput of 8.3 m3/hr @ 1.3% DS with a discharge of no more than 6%, based on a 5-hour day, 7-days per week operation at 100% of the maximum design load. The thickeners are arranged in a duty/standby configuration with two actuated isolation valves installed on the feed pipework allow this to be fully automated. If one thickener was to develop a fault, the standby thickener can resume operations without manual intervention.
Polyelectrolyte is made up on site to be added to the sludge fed to the sludge thickening plant. The addition of this chemical aids flocculation and makes thickening easier.
This plant is a liquid polymer set. The liquid poly is delivered within IBCs for the makeup process. The set mixes the poly from the IBC with water to a preset concentration rate and is then transferred to the poly storage tank. The duty poly dosing pump doses to the thickener’s sludge feed pipework from here.
Thickened sludge from the sludge thickening plant is transferred to the thick sludge tank. Here thickened sludge is stored for removal off site. A collection tanker removes the tank’s contents off site by coupling to the tank’s Bauer Coupler connector.
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PST No 1 & control building - Courtesy of BSG Civil Engineering Ltd[/caption]
The tank is equipped with a decant valve arrangement to facilitate settlement of the tank’s contents. The tank is also equipped with a level ultrasonic, low and high-level floats for level status and control of an externally fitted mixer for tank agitation.
The return liquors pumping station receives liquors from the following areas: inlet works drains, thin sludge tank decants and overflow, thick sludge tank decants and overflow, sludge thickening plant bund, FE and washwater drains and odour control plant drains. The station comprises of two fixed speed pumps, which are arranged in duty/standby arrangement. These return liquors to the activated PST splitting chamber.
Low level structures RC concrete installation - Courtesy of BSG Civil Engineering Ltd[/caption]
(left) Ballywhiskin TPS - Courtesy of NI Water, and (right) Carrowdore WwPS - Courtesy of BSG Civil Engineering Ltd[/caption]
(left) Sandycove WwPS and (right) Ballywalter Fowler Way TPS - Courtesy of NI Water[/caption]
NI Water, TetraTech, BSG Civil Engineering Ltd and Farrans along with local elected representatives to mark completion of the £18m Ards North Wastewater Improvement Scheme - Courtesy of NI Water[/caption]
Storm tank construction: (left) steelwork framework and (right) shuttering - Courtesy of Galliford Try[/caption]
Regraded operational land - Courtesy of Galliford Try[/caption]
(top left) Existing site prior to improvement works, (top right) site clearance, (bottom left) construction of temporary footpath and haul road to shaft and (bottom right) shaft cutting edge construction - Courtesy of Galliford Try[/caption]
(top left) Shaft collar constructed ready for sinking, (top right) shaft excavation with 27t excavator, (bottom left) first ring constructed ready for casting concrete jacking collar and (bottom right) shaft sinking in relation to public footpath - Courtesy of Galliford Try[/caption]
Ground conditions as identified in the borehole logs indicated a few meters of made ground and sub soil overlaying the Bude Metasandstone formation. The Bude formation had a reputation of being very hard and competent in places so Active Tunnelling Ltd opted to sink the shaft as a caisson with the option of underpinning if it could no longer be pushed down. Thankfully at this location the Bude formation did not prove too much for the excavators used to sink the shaft and it was successfully sunk as initially planned.
The arisings were removed from the shaft using an excavator mounted grab, before being loaded onto a tractor and trailer and tipped for drying further down in the field located adjacent to the pumping station.
One of the most challenging activities associated with the shaft was construction of a crane pad for the roof slab installation. A 180t mobile crane was needed to offload and install the various precast concrete panels which made up the shaft roof, however as the field was sloping steeply near the working area, a significant cutting around 3.5m deep had to be made in order to create an area level enough for the crane to set up on. Groundwater also became an issue at the cut edge into the hill and a drainage system had to be installed to divert the groundwater away from the crane pad to comply with the temporary works requirements on the design.
Directional drilling with slurry recycling operation - Courtesy of Galliford Try[/caption]
The river and A39 were not to only obstacles to overcome in this local area, there were sensitive fibre optic cables and also a medium pressure gas main. The chosen solution to overcome these obstacles was to directionally drill into the Bude Metasandstone and pass below everything at varying depths agreed with each stakeholder. Due to the location of the directional drill and also working on a flood plain next to a tourist ‘hotspot’, it was decided to minimise the construction site footprint west of the A39 as much as possible. To achieve this a slurry recycling plant was used to process drilling arisings with the processed arisings loaded straight into site dumpers and taken off to the tip.
The rising main itself was 180PE pipe which was butt fusion welded in advance of the drilling operation. The initial plan was to directionally drill the entire 486m of rising main however the Bude Metasandstone is a very strong rock and in places was less than 600mm below the field surface. The Gmac Utilities Ltd directional drilling team successfully drilled the road and river crossing at depth however the remaining section of rising main which was located at the interface between the sub-soil and the Metasandstone was almost impossible to control the drill line and level. It was therefore decided that traditional open cut excavation methods would be used to complete this section of the rising main.
(left) Shaft drop pipe and pump sump with baffle plate and (right) shaft fit-out - Courtesy of Galliford Try[/caption]
At pre-construction stage it initially made sense to locate the new pumping station on the western side of the existing building next to the existing wet well however this would have meant the felling of a very large and mature Ash tree (showing no signs of Ash die-back) and would have also resulted in around 2m of the new structure being visible above ground, due to its location on the downward side of the boat lift incline. Both the felling of a mature tree and the visual impact of a structure at this location was deem too significant to ignore and by moving the new pumping station location to the east of the existing building, constructability improve and therefore cost reduced.
An existing hedge bank and a few immature trees had to be felled in order to allow access to the site to undertake construction works. A replacement Cornish hedge bank was constructed to replace what was lost at the end of the project and replanted with native hedge and tree species with the aim of improving what was removed once the young plants had established.
Shaft crane pad construction - Courtesy of Galliford Try[/caption]
Through this close relationship, one of the landowners asked that a manhole cover be removed following abandonment of the soon to be redundant rising main and the site team suggested that they could fill in and re-profile a small depression left following the removal of an overhead power cable pylon. A few little gestures such as these went a long way with the landowner and were not underestimated by the site team.
(left) Schematic showing the route of the new gravity sewer and new rising main and location of the new SPS and (right), illustration from the Wessex Water leaflet to property owners showing responsibility split - Courtesy of Wessex Water[/caption]
Residents in Sherston applied for an FTS scheme due to this pollution, which led to an assessment by Wessex Water which concluded that a public FTS was viable and could be progressed to design and construction. Wessex Water carried this out using their in-house capabilities at a cost of £2m. Although only a few properties were causing environmental and public health issues, Wessex Water included as many properties as possible within the FTS scheme, taking into account the viability of doing so. As a result, 24 properties (estimated population equivalent of 60) currently on septic tanks will be able to connect to the new public sewerage system by July 2023. Wessex Water’s FTS policy is to construct the new public sewerage system up to the inside the property boundary, where it terminates within a demarcation chamber. This chamber denotes the boundary between the public and private drainage system.
Penstock ready to be installed over the outgoing pipe (on the left) within a manhole chamber upstream of the wet well - Courtesy of Wessex Water[/caption]
Several iterations of the design were undertaken to confirm the best route of the pumped rising main, location of the proposed new SPS and access road, as outlined below:
Connection to the existing sewerage network in Easton Town (B4040) - Option discounted
This solution provided the shortest route for the proposed new rising main and access track to service the new SPS. However, the rising main route would need to pass through a narrow driveway between existing houses.
Due to the depth of the excavation, an open cut construction method was discounted as it would be within the zone of influence of the building foundations and consequently had the risk of undermining and causing structural damage to these buildings. Trial holes indicated shallow rock which would have further exacerbated structural damage due to vibration when breaking out the rock.
Trenchless techniques were considered, however due to the rock, only micro-tunnelling would be suitable, and would require a reception pit within Easton Town road, which would cause significant disruption to the community. Micro tunnelling would have also resulted in the scheme becoming financially unviable.
Connection to the existing sewerage network in Sandpits Lane (access via Sandpits Lane) - Option discounted
This solution provided the next shortest route for the access track to service the new SPS, and although the rising main route was extended, it allowed for an additional gravity sewer to be laid within the same trench to connect four additional properties at minimal cost, which increased the cost viability of the scheme.
Prior to submitting a planning application for this option, Wessex Water consulted with the community. Significant public objections were raised due to the visual impact of the proposed new access track and SPS, particularly from those who were already on mains drainage and would not benefit from the FTS scheme. In addition, land purchase negotiations for the access track could not be resolved.
Connection to the existing sewerage network in Sandpits Lane (access via Tetbury Road) – Selected Option
The sewerage network for this option was similar to Option 2, however the access track route and SPS location changed to take into account the points raised from those objecting on the grounds of visual impact and land purchase issues.
This option was confirmed to be both technically and financially viable and no public objections were raised, which was valuable in securing planning permissions.
(left) Excavation of shallow rock for rising main and (right) internal view of the wet well before sump benching - Courtesy of Wessex Water[/caption]
(left) Shuttering around the wet well in preparation for pouring the final layer of concrete surround and installing dowels into the valve chamber and (right) construction of wet well - Courtesy of Wessex Water[/caption]
All pipework within the valve chamber was constructed in ductile iron DN80 and the rising main was constructed in MDPE pipe, SDR17, OD 110. The gravity pipework was constructed in PVCu Funke Gruppe pipe (100 mm and 150 mm internal diameter), which was selected to provide due to its light weight and construction durability compared to conventional vitrified clay pipework.
Penstocks were required so that incoming sewerage flows can be controlled, to allow isolation of the wet well for cleaning and maintenance. The penstock was designed to be located within the wet well, however concerns were raised by the site team that the proposed opening for the penstock spindle would be difficult to cast in the correct location during the off-site fabrication of the cover slab. To resolve this, the cover slab design was amended to remove the penstock spindle opening, and it was moved to an upstream manhole, where the penstock could be positioned within the clear opening of the manhole cover.
An overpumping connection allows for the temporary pumps to be installed and connected to the rising main via a Bauer coupling on the pipework from within the valve chamber. The valve chamber cover was designed to allow for the safe operation of the Bauer coupling by having a split walk-on grid over the coupling.
This allowed the operator to place the foot on one of the closed flaps, whilst the other flap is lifted, thereby allowing them to position themselves directly over the Bauer coupling. This avoids the operator having to lean over an opening or handling the tankering hose with one hand.
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Valve chamber cover, with split walk-on grid over the Bauer connection - Courtesy of Wessex Water[/caption]
(left) Q-bic system construction and (right) concrete slabs being cast over the crates to form the turning area - Courtesy of Wessex Water[/caption]
Public drop-in session and (inset) 3D model of the new sewage pumping station - Courtesy of Wessex Water[/caption]
All temporarily affected habitats were seeded with a species-rich grassland and wildflower mix, managed to avoid cutting during the late spring and summer to benefit invertebrates and other wildlife. Off-site biodiversity enhancement measures were also undertaken in Sherston Primary School, including planting of additional trees, wildflower meadow, and providing bird nesting pockets to students.
Close interaction with residents is a key feature of FTS schemes due to the work within private gardens. All residents were contacted prior to construction via face-to-face meetings and community drop-in session to give them the opportunity to ask any queries direct to the Wessex Water Project Team. A 3D model of the proposed sewage pumping station was created and used during the drop-in session to provide more clarity for the public on the proposed solution.
(left) Existing site on western shores of Lough Neagh, (top right) existing PSTs, and (bottom right) existing percolating filters - Courtesy of NI Water[/caption]
Early excavation works with compound set up - Courtesy of NI Water[/caption]
The contract delivery team worked in a collaborative manner with NI Water, project managers RPS, and key suppliers and subcontractors to deliver a robust, effective and modern treatment solution which allows for future growth in the catchment area and protects the environment by adhering to a tighter discharge consent.
Excavation of FSTs to depth of 5m - Courtesy of NI Water[/caption]
Bottom section of FSTs installed - Courtesy of GEDA Construction[/caption]
Make up of the FSTs from KEE Process - Courtesy of GEDA Construction[/caption]
Installation of RBCs - Courtesy of GEDA Construction[/caption]
Construction of inlet works, sludge tank & storm tank - Courtesy of NI Water[/caption]
Completed Ballyronan WwTW - Courtesy of GEDA[/caption]
Google Maps image showing location of the site[/caption]
Storm tank under construction - Courtesy of Paul Milligan & CWA[/caption]
Marchmont FAS project site - Courtesy of Paul Milligan & CWA[/caption]
Storm tank roof installation - Courtesy of Paul Milligan & Caledonia Water Alliance[/caption]
Customer information event - Courtesy of Scottish Water[/caption]
(left) Piling rig set up, (middle) piling reinforcement, and (right) piles cropped - Courtesy of Galliford Try[/caption]
(left) Base shuttered and wall starters, and (right) steelwork for base slab - Courtesy of Galliford Try[/caption]
(left) Jacopa wave screen in the storm tank, (top right) Inlet screen installation in the channel, and (bottom right) inlet screen in action - Courtesy of Galliford Try[/caption]
Aerial shot showing Galmpton STW on the right and rising main scar through the fields on the left - Courtesy of Galliford Try[/caption]
Galmpton stormwater storage tank following the installation of the flushing bell and air valve release pipework - Courtesy of[/caption]
Storm tank roof installation main beam lift - Courtesy of Galliford Try[/caption]
Galmpton storm tank with the precast concrete roof installed - Courtesy of Galliford Try[/caption]
Mini CS & Company News
- Hookstone Road CSO (SDS Limited)
- Alleviating Flooding at Beaumaris Castle
Alleviating Flooding at Beaumaris Ca...The project required the contractor to excavate within 25m of Beaumaris Castle – a UNESCO World Heritage site and one of the best examples of 13th and 14th century architecture in Europe attracting over 100,000 visitors last year. Faced with the challenge of installing 600m of 1.5m diameter polypipe in 6m sections between existing manholes, John Kelly Construction spent time researching the products available on the market, before finding that MGF’s High Clearance Trench Boxes were ideal for the job. [caption id="" align="alignnone" width="1200"]
Courtesy of MGF Ltd[/caption]
The 7m x 2.9m wide High Clearance Trench Boxes coupled with Top Boxes saved time and money to the contractor when compared to sheets and frames. The strength of the box allows suitability and capability of going to 5m depth and having high clearance struts on both ends of the box allows access at both sides – ideal for installing larger diameter pipes.
[caption id="" align="alignnone" width="1200"]
Courtesy of MGF Ltd[/caption]
Paul Cowen, Technical Sales for MGF commented:
“Beaumaris’ most recent floods in 2017 was the catalyst that something needed to be done regarding the surface water drainage system. MGF became involved to supply the excavation support equipment to alleviate the threat of flooding to protect the natural beauty and tourism trade in the area”.
MGF’s stock logistics team confirmed availability of the kit at our Dartford depot and coordinated transfer to the Astley depot before delivery to site with three 40ft articulated vehicles and two 15t wagons to ensure the order was met. [caption id="" align="alignnone" width="1200"]
Courtesy of MGF Ltd[/caption]
John Kelly, Managing Director of John Kelly Construction, stated:
"I was very impressed with MGF as a company as they were very quick to respond to our queries, provided designs and all equipment ordered arrived on site with no delays."
- Sector: Water & Utilities
- Client: Isle of Anglesey County Council
- Contractor: John Kelly Construction
- MGF depot: North West - Astley
- Products hired: High clearance trench box, top boxes & titan manhole box
For more information: MGF Ltd | +44 (0)1942 402700 | www.mgf.co.uk
- Intellistorm®: Smart Rainwater Management Systems
Intellistorm®: Smart Rainwater Mana...SDS Ltd has completed the installation of its latest smart rainwater management systems at homes in Forton, Lancashire, and Deal, Kent, as part of Water Companies’ ongoing efforts to reduce sewage spills into rivers and the sea. The company’s Intellistorm®-equipped rainwater harvesting tanks use smart technology to retain and release their contents automatically, thereby increasing, by several times over a standard water butt, their capacity to protect the sewers from being overwhelmed by excess surface water from heavy rainfall. More than sixty systems have already been installed by agreement with homeowners by SDS in January and February 2023 for United Utilities and Southern Water. The two Water Companies have committed to deploying several hundred tanks over the next few weeks, including at properties served by United Utilities at Wrea Green in Lancashire, and by Southern Water at homes in its “Pathfinder” locations in Kent and the Isle of Wight. Intellistorm® works by releasing water from the tank prior to rainfall. By analysing weather forecast data the system calculates how much water to release based on the roof size and the size and location of the tank. This ensures that there is always water available for homeowners to use, for example in their gardens, but also sufficient spare capacity in the tank to accommodate the next rainstorm. A typical water butt fills once in the winter and then remains full and overflows until water is taken out by the homeowner, often only when summer has arrived. Consequently, a standard butt contributes little to holding back water from sewer networks during the wettest months of the year. SDS has carried out an assessment of the performance data supplied by the initial 25 tanks at Forton after their first month of operation. Extrapolated across 12 months, and using average rainfall statistics, it has been established that the tanks could hold back up to 75 times their nominal volume, equivalent to each tank holding back 30,000 litres of water a year from the combined sewer at times of peak flows, which is when sewers typically overflow. In Forton alone this equates to a surface water attenuation volume of up to three quarters of a million litres of water per year*. That water is then released once the rain event has passed and the sewers can cope. [*based on average rainfall accumulations – these figures will vary if the weather is drier or wetter than the average]. Johnny Phillips, Surface Water Strategy Development Manager for United Utilities, said:“We’re delighted to be launching this initiative in Forton. Having looked at a number of areas, we think the smart water tanks will make a real difference in the village and help to increase capacity in our sewer network and deliver local environmental improvements, and the early findings are backing this up.”
Dr Neil Sewell, Director of New Technology Services at SDS, said:“We’ve made exciting enhancements to the Intellistorm® technology since our early projects with South West Water, Anglian Water and Severn Trent Water and we’re pleased to show how the latest version of the tanks begins to deliver some really strong performance in Forton and Deal.”
These projects show that Intellistorm®-equipped smart tanks have the potential to be a really valuable tool for Water Companies in the battle against sewer overflows and flooding, particularly when they are coupled with other sustainable drainage systems and sewer network improvements. They have the added advantage of providing a supply of non-potable water for homeowners, thus reducing the demand for mains-supplied, drinking-quality water for purposes for which its high level of treatment is not required, whether that’s for watering the garden and washing the car or even flushing the toilet and supplying the household washing machine. It is also a great way for local people to get involved with helping to solve flooding and pollution, thereby improving water quality in our rivers and bathing waters, as well as protecting the country’s declining natural water resources from over-abstraction, in order to feed a growing and increasingly water-dependent population. Thanks to their multiple benefits SDS is seeing significant interest from Water Companies in its Intellistorm® systems.
For more information: SDS Ltd | +44 (0)1934 751303 | www.sdslimited.com
- RAF Lossiemouth Stormwater Attenuation
RAF Lossiemouth Stormwater Attenuati...RAF Lossiemouth in Moray, north-east Scotland, is one of two RAF Quick Reaction Alert stations, whose aircraft and crews are on continual high alert in order to scramble and intercept unidentified aircraft approaching UK airspace. The MOD has committed to a £3bn investment for the transformation of the base, which is staffed by more than 3,000 military and civilian personnel. SDS was required to implement a drainage scheme that enabled sustainability principles at every stage of the project, with the objective of dispersing water quickly and efficiently from the air-side paved surfaces of the base. The project ensured that the operational capabilities of the air base are not compromised by flooding from heavy rainfall, and future-proofed the RAF base for the introduction of Boeing P-8A Poseidon Maritime Patrol Aircraft.Project scope
SDS designed, manufactured and installed a Weholite® tank, measuring 90 metres square, constructed predominantly of 260 individual pipes of 14 metres in length, and 50 pipes of approx. 7 metres in length, all with a 1.2 metre diameter. In excess of 4.4 kilometres of 1200mm diameter 4K pipe, together with 10 manholes, have been manufactured and installed by SDS, with a combined bill of materials weight of over 300 tonnes. Special attention has been paid to the potential flood risk due to the coastal location of the site in an area of Scotland which is known for its wet and harsh weather, particularly in Winter when snow melt can create significant volumes of standing water. The system complies with the Water Environment (Controlled Activities) (Scotland) Regulations 2011 (CAR) which have made SuDS a requirement for all new developments constructed after April 2007. [caption id="" align="alignnone" width="1200"]
The Weholite stormwater attenuation tank[/caption]
Results
All stormwater attenuation is situated below ground due to the restriction of having open bodies of water in close proximity, which might attract unwanted birds to the airfield. Due to site levels and the relatively high water table, soakaways were deemed unsuitable for stormwater discharge, therefore the flow rate is restricted to 5 litres per second per hectare of impermeable area before discharging into the drainage system. Oil interceptors located between the drainage system and the neighbouring Covesea Burn help to prevent any contaminated runoff from the runway from entering the natural environment. Malachey Doyle, Project Manager, Lagan Aviation & Infrastructure commented:“Safe, tidy and impressive work rate by all within our Central and Eastern section at RAF Lossiemouth. Works have comprised a new wastewater treatment works, 90m x 90m oversized attenuation tank, roads, drainage and associated Infrastructure.”
Lagan Aviation & Infrastructure have delivered over 60 airport projects worldwide and operate out of two main offices, Belfast in Northern Ireland and Washington in the USA. They have established a network of trusted contractors and supplier organisations of which SDS is proud to be a part. [caption id="" align="alignnone" width="1200"]
RAF Lossiemouth © Crown copyright 2021[/caption]
Project summary
- Project purpose: To prepare and future-proof the RAF base for the introduction of Boeing P-8A Poseidon Maritime Patrol Aircraft.
- Project objectives: To disperse surface water quickly and efficiently from the air-side paved surfaces of the base.
- Project requirements: To implement a drainage scheme that enables sustainability objectives to be met at every stage of the project.
- Brief to SDS: To ensure the full operational capabilities of the air base are not compromised by flooding from heavy rainfall.
- Timing: Autumn Winter 2021/22.
- Project background information: RAF Lossiemouth in Moray, north-east Scotland, is one of two RAF Quick Reaction Alert (QRA) stations, whose aircraft and crews are on continual high alert in order to scramble and intercept unidentified aircraft approaching UK airspace. The MOD has committed to a £3bn investment for the transformation of the base, which is staffed by more than 3,000 military and civilian personnel.
- Client: Lagan Aviation & Infrastructure.
- End customer: Defence Infrastructure Organisation (DIO).
- Supplier of Weholite® wastewater storage tanks, manholes & conveyance piping: SDS Ltd
For more information: SDS Ltd | +44 (0)1934 751303 | www.sdslimited.com
