Managing water summer 2016

The on-line magazine for the water management industry

and its environment

Working on the Leeds Flood Alleviation Scheme Courtesy of WM Planthire

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Summer

2016

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Contents Flood Risk

Failing to protect communities at risk of flooding

5

Recovery continues in Yorkshire six months on from floods

10 - 11

Repairs complete and a new long term flood plan for Cumbria

Cumbria flood plan - 6 months on

6

Phase two of £32 million Exeter flood defence scheme begins Leeds Flood Alleviation Scheme taking shape

Trade body concerns over flood assurance standard FloodEX - a huge success

Surface Water & SuDS

10

Keeping Rivers Cool

26

21

28 - 31

Flow Controls Deliver SuDS Design for Challenging Llanelli Housing Development

Hydro-Brake® Flow Control Series Launch Delivers Comprehensive Toolbox

27

32 33

Shady Characters Needed To Cool Our Rivers

35 - 36

New fish pass opens up 34km of River Witham

38

ADC add amphibious workboat to their equipment list

Directory

Contact information Luton Airport SuDS Scheme

18

Luton Airport installs ground breaking new water management system

World fish migration day highlights successes

16

16 - 17

25- 26

River Restoration and Management

Model and mapping catchment processes

12 - 14

SUDS – a Matter of Definition?

Hydrok pipe work welding, design and fabrication

Report into the Foss Barrier failure

6 -9

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3

Flood Risk

Flood Risk

The Government is failing to protect communities at risk of flooding The Environmental Audit Committee has published a report finding that the Government is failing to protect communities at risk of flooding.

allocated based on a “political calculation”. This could lead to inefficiencies in flood investment, poor decision making and, potentially, regionally unfair outcomes.

With regards to funding for flood defences the Committee warns that a reactive approach to funding for flood defence exposes the Government's lack of long-term strategic planning to manage flood risk. The Committee found that funding fluctuates year-on-year. During the last Parliament funding was initially cut and only increased after the winter 2013/2014 floods.

While there is national policy in place to plan for flood prevention, the number of local flood plans and strategies under the NPPF is worryingly low and the Government does not seem to be supporting local authorities to develop them.

Flood defence funding

Mary Creagh MP, Chair of the Environmental Audit Committee, said:

"We know that flooding is projected to get worse and occur more frequently because of climate change, so it just isn’t good enough for Government to react to flooding events as they occur. Communities at risk deserve certainty from Government."

Critical flood defences in declining condition

The Committee also found that the condition of critical flood defences was in decline. The independent Worsfold review demonstrated a relationship between flood maintenance spending and the good condition of critical flood defences. As the money required to maintain these defences was cut, the number of defences which met the Environment Agency's required condition also declined.

Mary Creagh said:

"The Government needs to put money into the upkeep of existing flood defences as well as investing in new defences. Failure to do so can have terrible consequences for residents and businesses when defences fail.

"Any decline in the condition of critical flood defences represents an unacceptable risk to local communities in flood prone areas. We urge the Government to go beyond its current target and aim to have virtually all its critical assets meeting the Environment Agency's required condition by 2019."

The Committee learnt that, while most government flood spending would be allocated according to strict economic criteria, a significant proportion of the new funding announced in this year’s Budget - £700 million - would be

Too few local flood plan and strategies

The Committee is concerned that the Government does not know how prepared local authorities are for mitigating future flood events or whether their flood plans (if they have them) are fit for purpose. The extent to which the Environment Agency’s advice on whether, or how, to build in high flood-risk areas, is not systematically monitored, reported or followed up through the planning system.

Mary Creagh said:

"Local Authorities are not receiving the support they need to prepare for, and mitigate, the impacts of flooding."

Varying degrees of flood preparedness

The Committee found that infrastructure companies are adopting varying degrees of flood preparedness. There is a lack of Government vigour to ensure a consistent and robust approach is taken to protecting essential services.

For public confidence, infrastructure companies should be mandated to report their target flood resilience level, why this target is appropriate and what progress they are making to achieve it.

The MPs were disappointed by the lack of transparency demonstrated by the Government’s failure to publish the results of past reviews and to track in an open way how it has implemented them. The Committee recommends that the Government produce an annual national flood resilience review accompanied by an action plan. It suggested that the Government’s current National Flood Resilience Review would be a good place to start.

Mary Creagh MP said:

"It is critical the Government undertakes its current review in an open and transparent way to allow stakeholders, including Parliament, to monitor its progress and hold it to account."

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5

6 months on from the floods in Cumbria

Flood Risk

Repairs complete and a new long term flood plan In the months since Storm Desmond hit Cumbria the emergency repairs to defences have been completed and over 30,000 tonnes of gravel have been moved.

Repair work at Kendal

Ivestigations are well underway to pin point the cause and extent of flooding. The findings will mean that the Environment Agency have the evidence needed to ensure the right work can take place in the right areas to create the best protection for the people of Cumbria.

The data gathered by the investigations will be used to update the mapping modelling and flood warning service.

Kathryn Tanner, Recovery Manager, for the Environment Agency, said:

Since December, the Environment Agency has been working hard to protect local communities. We’ve been tackling the emergency repairs needed and clearing debris from channels washed down by the winter floods. This work will continue throughout the summer so that we’re ready for winter 2016.

We’ve also employed a number of flood and engineering experts to support our investigations of the cause and extent of the December floods. They’ve helped us to identify what worked and what didn’t, what

additional actions could help with future floods and also how to better work with, rather than against nature and the existing landscape to reduce the risk of future flooding.

The findings of these investigations will inform the Flood Investigation Reports being produced by Cumbria County Council, which we can then use to inform community flood risk management plans and future spending on flood defences.

These will form part of the whole river catchment action plans which Cumbria Flood Partnerships are developing. These draw together and identify additional actions required to reduce flood risk from source to the sea.

Keswick glass panel repair

River Derwent

8 recovery projects have been completed including Pumping station repairs, wall replacements at Cockermouth and Maryport, as well as embankment repairs at Southwaite Mill. 14 repair projects including flood defence repairs, Keswick glass panel and asset repairs, embankment repairs, rebuilding flood defences at Barepot, gravel removal and the stabilisation of a landslip are currently being carried out, with a further 5 projects in the planning stages.

Amy Heys, Catchment Director for the Derwent, said:

I’m investigating what organisations and communities can do to reduce the risk of flooding in the Derwent catchment. I’m speaking to communities, organisations, landowners and farmers to consider what we can do upstream to slow the flow of water, and what needs to be done downstream to protect homes, businesses and infrastructure.

I’m working with the NFU and Farmers Network to discuss with farmers in the area the possibilities of using upstream mitigation measures to reduce flood risk.

I’ve earmarked Braithwaite and the Above Derwent Parish as the location for a pilot that will trial a more inclusive community based

6

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Flood Risk

approach to flood risk planning.

I’ve also been speaking to the Environment Agency, who have commissioned modelling and are working with United Utilities and Keswick Flood Action Group to better understand the impact that Thirlmere has on flood risk in the upper Derwent.

River Eden

10 recovery projects have been completed including pumping station and storage basin repairs at Durranhill, repairs at and around Little Caldew pumping station, flood defence and culvert repairs at Appleby as well as the Crosby on Eden embankment repairs.

12 repair projects including floodgate replacements, embankment, channel and wall repairs are currently being carried out, with a further 3 projects in the planning stages.

Jim Ratcliffe, Catchment Director for the Eden, said:

Since January, I’ve been speaking to partner organisations and local communities to identify what is already being done across the Eden river catchment to reduce flood risk and what we can do in the future.

This process has helped us identify locations for 2 pilots where we’ll trial community led projects to reduce local flood risk. In Stockdalewath, organisations like the Environment Agency and Eden Rivers Trust will help the community Roe and Ive Water Management Group deliver their plan to use natural flood management measures, such as allowing more water to soak into fields through sub-soiling.

And in Glenridding and Patterdale we will support the local community as they develop a community flood action plan so they know what to do when there’s a risk of flooding, and know how to support one another.

I’ve also been having discussions with local landowners, farmers and their representatives to look at how water could be temporarily slowed down in the Eden catchment during

storms to reduce flood risk. This work will run over a longer period of time, and initially focus on the smaller subcatchments of the Eden.

I’m also identifying options for improving the flow of water in local rivers, considering how bridges impact upon flood risk and how best to manage river gravel at key locations.

These investigations will help us pinpoint the right solution for the right place, and then it will be up to local communities and organisations to get behind the plan and deliver it together.

Rivers Kent and Leven

So far 7 recovery projects have been completed including flood wall replacement at Ambleside and Burnside, work to deal with the River Sprint landslip and large scale gravel and debris removal at a number of sites. 11 repair projects including embankment repairs at Brigsteer Beck, flood basin and channel repairs at Stock Beck, channel repairs at Kendal and repairs to the industrial estate embankment at Mintsfleet are progressing with a further 7 projects in the planning stages.

Celia McNally, Catchment Director for the Kent & Leven, said:

I’m working closely with communities, organisations, farmers, businesses and landowners in the Kent and Leven catchment in South Cumbria to identify actions already being taken in the area to reduce flood risk.

I’m also considering what else can be done along the whole river catchment, from source to the sea, so we can develop a longer term plan.

The first version of our Cumbria Flood Action Plan is due for publication this summer, and I hope it will inspire communities and organisations to work together to reduce flood risk across the whole county.

By working with landowners, NFU and farming communities we’re also beginning to capture local knowledge and identify opportunities for www.fadsdirectory.com

managing land in a way that supports their business and reduces flood risk downstream.

I’ve been able to identify Staveley as a suitable pilot location. This will help us work out how organisations can work with local people to reduce and manage flood risk in a way that best suits their community and reflects the specific characteristics of their catchment.

I’m involved in discussions for the creation of a new Lyth Valley Water Level Management Board. A group of local people, landowners, farmers and environmental groups are working with the Environment Agency to develop a proposal that reflects the needs of the area; socially, economically and environmentally.

They then aim to share their proposal for consultation in early 2017.

I’ve also been working with United Utilities to understand if the redundant Birds Park Reservoir and adjacent land could be used to reduce flows into one of the Stock Beck tributaries and reduce flood risk in Kendal.

This process has helped us identify locations for 2 pilots where we’ll trial community led projects to reduce local flood risk. In Stockdalewath, organisations such as the Environment Agency and Eden Rivers Trust will further help the community Roe and Ive Water Management Group deliver their plan to use natural flood management measures, such as allowing more water to soak into fields through subsoiling. And in Glenridding and Patterdale we will support the local community as they develop a community flood action plan so they know what to do when there’s a risk of flooding, and know how to support one another.

Cumbria Floods Partnership

At the same time, the Cumbria Floods Partnership, led by Floods Minister Rory Stewart, is reexamining the river catchments in Cumbria from the source to the sea, to make sure that money spent on the environment, farming, and water supply contributes to flood protection.

Their aim is to identify ways to 7

manage and reduce flood risk at the same time delivering wider benefits to the local economy, landscape, wildlife and water quality. The partnership is investigating what actions can be taken upstream to reduce river flows, such as treeplanting and the use of flood storage basins, to supplement downstream actions such as gravel-removal and the construction of flood defences.

The partnership consists of community groups, environmental groups, farming representatives, the Environment Agency, Defra and local authorities. Over 100 communities across Cumbria have been consulted as the partnership drafts the first version of a 25 year action plan that will combine the expertise and flood modelling capacity of the Environment Agency with the local knowledge of those working the land or living within affected communities.

Flood Risk

The Long-term action plan to reduce flood risk in Cumbria The Cumbria Flood Action Plan sets out the short-term actions that will see 4,300 homes in the region better protected, as well as the long-term actions that will see local organisations and communities working in partnership to develop better ways of managing rivers and the land.

The Government has already invested over £150m in Cumbria through repairs to infrastructure, direct payments to flooded households and business, removing debris and gravel and funding to match the tremendous generosity shown in charity appeals.

This plan shows how Government along with others will continue to Catchment management in Cumbria – long-term vision

boost Cumbria’s resilience to flooding by: • Better protecting at least 4,300 Cumbrian homes from flooding using up to £72 million of government funding – this is £4m more than previously announced.

• Restoring 350 hectares of peatland to hold water upstream for longer at several sites around the Eden, Derwent and Kent/Leven catchments.

• Working with United Utilities to explore changing the way local reservoirs are managed to provide more storage during the winter.

Operate public water supply reservoirs so that they help to manage flood risk and provide secure water supplies.

Use uplands to slow the flow by planting trees, installing woody dams and restoring peatland.

Floods Minister Rory Stewart said:

We owe a huge debt of gratitude to Cumbrian communities, to volunteers and to officials. It’s fantastic that since Storm Desmond hit last December, Environment Agency teams have undertaken a Herculean task with a £10m flood defence repair programme across Cumbria. And it’s great news that the government has committed a further £68m to flood defences in Cumbria, better protecting more than 3,500 homes across the county.

Work with farmers and landowners to manage farmland to reduce run-off and restore meandering rivers.

Protect our villages and towns by building flood defences, maintaining the flow under bridges and making existing and new buildings safe and resilient.

The Cumbria Floods Partnership is at the heart of managing flood risk in the future. We are looking at how we manage flood risk from source to sea with new Catchment Directors using the best local expertise and knowledge to better protect our communities.

8

Collaborative working with communities and partners across water and land-management issues to form and deliver innovative solutions.

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Actively manage gravel to ensure it does not increase flood risk.

Flood Risk

• Working with 4 small communities to agree how the way the land managed above the villages can be changed to reduce risk to residents, whilst also maintaining benefits for farmers and landowners.

• Making sure that all future planning permission granted in Cumbria takes account of learnings from Storm Desmond.

• Considering how we can reduce flood risk along the 3 catchments most severely impacted by Storm Desmond – the Eden, Derwent and Kent & Leven. Measures will include tree planting and restoring river bends as well as more traditional engineering solutions such as flood walls in towns.

The plan strikes a balance between our investments in flood defences and other Government investments in the environment, farming and water quality.

This is a significant part of the Government’s new 25 year environment plan which will have a

powerful and permanent impact making Britain a safer, cleaner and greener place to live and work.

Floods Minister Rory Stewart said:

This plan is what Cumbria needs to help protect its businesses, people and infrastructure from flooding – now and over the longer term. This is largely thanks to the incredible spirit of the Cumbrian people, with local groups, local authorities, the Environment Agency and landowners all working with us to find the best answers for every area.

The government has committed up to £72 million to protect Cumbria from flooding and this plan uses local expertise to identify where that money will be best spent to benefit communities, by re-examining river systems from source to sea.

Read the The Cumbria Flood Action Plan.

This action plan represents a step change in the way we manage flood risk in Cumbria. It sees local

Secretary of State for the Environment, Food and Rural Affairs, Elizabeth Truss, has appointed Maria AdebowaleSchwarte to the Board of the Environment Agency as natural environment lead.

The appointment will take effect from 1 July 2016 for three years.

All appointments to the Environment Agency Board are made on merit and political activity plays no part in the selection process. The appointments comply with the Code of Practice of the Commissioner for Public Appointments.

The development of the long-term plan relies on continuing to work with the communities and farmers who live alongside these rivers and have experienced flooding at first hand.

This is your opportunity to get involved and help make Cumbria more resilient to flooding.

Environment Agency Flood Risk Manager Andy Brown said:

Urban renewal expert appointed to the Board of the Environment Agency

Board members provide nonexecutive leadership challenge and support to the executive through regular Board meetings, committees and groups. They also undertake individual lead roles on relevant issues and with local operational teams.

communities at the heart of the process, working with organisations to reduce flood risk along the length of Cumbrian river catchments, from the Fells to the coast.

Biographical details of Maria Adebowale-Schwarte

Maria is an urban renewal expert, focusing on the environment, local economic and social prosperity, green spaces, cross-sector collaboration and community participation. She is currently the www.fadsdirectory.com

Director of Living Space Project, an urban place making and green space think tank and consultancy.

Maria is also an adviser to charitable foundations and grant makers.

Maria was the first recipient of the Clore Social Leadership Environment Fellowship and her prior appointments include Commissioner of the UK Sustainable Development Commission and a Commissioner of English Heritage.

She has served on a number of advisory committees for Defra, CLG, Natural England, Big Lottery, Joint Ministerial Task Force on Climate Change, and Nesta.

Maria is a patron of the UK Environmental Law Association, a trustee of the Trust for Conservation Volunteers, an ambassador of the Women’s Environment Network and Chair of the Heritage Lottery Fund, South East Committee.

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Flood Risk

Recovery continues in Yorkshire six months on from floods The Environment Agency is embarking on a significant programme of repairs to flood defences damaged by flooding.

It’s now six months on since the devastating floods of December 2015 and the Environment Agency is embarking on a significant programme of repairs to flood defences damaged by the flooding.

More than 9,000 householders and businesses across north and west Yorkshire were affected by the flooding and have spent much of this time dealing with its effects.

Over the last six months the Environment Agency has conducted a massive recovery operation assessing and repairing damaged flood defences, walls and structures so that they can continue to protect communities.

They’ve checked nearly 8,500 assets in total and had completed all the emergency repairs by the end of February. Field teams and contractors have worked tirelessly to build temporary defences and clear obstructions such as collapsed bridges, buildings, thousands of tonnes of gravel, debris and vehicles from rivers to reduce further flood risk at 150 locations.

Teams ‘working tirelessly to restore protection’

Phil Younge, major incident recovery manager at the Environment Agency said:

10

The floods of December 2015 had a terrible impact on peoples’ lives, homes and businesses across the county.

Sadly, some residents and businesses are still feeling the effects such flooding events can bring.

Teams are working hard to get defences back in a condition they were prior to flooding. We are on track to achieve this huge challenge, and our teams are working tirelessly to restore protection to communities.

Building resilience in those communities badly affected last December is key and we have been working closely with risk management authorities, local communities and other partners to form a collaborative approach for these areas.

Programme of work begins

While work continues to clear many more sites the Environment Agency is beginning its programme of work to tackle the larger scale repairs to damaged flood defences.

This week they are rebuilding walls near Shade School and behind the market in Todmorden, which collapsed in the floods. Debris and gravel is also being cleared from the channel to improve the flow of water near the school.

Further gravel removal works are being planned across Calderdale in the coming weeks, as well as wall repairs.

Flood bank and wall repairs are being done on the River Aire, from the lower reaches of the catchment at Airmyn,

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Flood Risk

all the way through Leeds and up to Skipton, where defences have slipped or been damaged by the floods.

On the River Wharfe, work is about to start to repair a bank slip at Collingham near Wetherby, which was another community affected by the Christmas floods.

The target is to restore assets back to pre-winter 2015 standards by the end of September 2016.

Another important area of Environment Agency work has been supporting those affected by the flooding. They’ve visited around 150 communities, providing support in a variety of ways including holding community events, advising on flood resilience measures and sharing plans for future flood alleviation schemes.

Asset recovery and engagement work has been a priority for the Environment Agency over the last six months, but it’s only part of the story.

Since December 2015:

• Government announced £115 million for flood defence investment in Leeds, York and the Calder Valley

• Work to upgrade the Foss Barrier Pumping Station began in April and is progressing well. Three temporary pumps have been installed as well as a temporary elevated platform on which to house all the equipment while work to install new equipment progresses

• The Foss Barrier investigation report was published, which looked at the events leading to the opening of the barrier on Boxing Day 2015 • The Leeds Flood Alleviation Scheme scoping report was launched, which sets out options to reduce flood

risk to the city centre and Kirkstall Road, along with an initial timetable for delivery.

• The action plan for Mytholmroyd was launched which sets out the programme that will be implemented to further reduce flood risk to the town along with the anticipated timescales for delivery.

• A flood information centre was opened in Mytholmroyd

• The Calderdale Catchment Partnership has been formed to provide a collaborative process for the production of the Calderdale Catchment Plan.

• Worked with partners and communities to gather information to produce the flood extents of the December 2015 flood event.

By December 2016:

• All damaged assets will have been repaired to a preDecember 2015 standard by the end of September 2016.

• Subject to planning, the main flood alleviation work in Mytholmroyd will be underway • Catchment plans for York and Calderdale will have been produced putting forward options for managing flood risk.

• New, high capacity pumps will be installed and operational at Foss Barrier Pumping station

• The December 2015 flood extent maps will be available on GOV.uk from 1 November 2016.

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Flood Risk

£17m upgrade to prevent a repeat of Foss Barrier failure The Environment Agency has published an independent report commissioned to investigate how water got into the Foss Barrier Pumping Station in York on 26 December 2015.

On Boxing Day, more than 600 homes and businesses were affected when exceptionally high rainfall and river levels led to extensive flooding in the city of York.

Consultants, CH2M, were instructed to look into how water got into the structure and what steps would need to be taken to minimise the risk of it ever happening again.

The report provides a summary of the facts relating to 26 December 2015 when water entered the building at the Foss Barrier, including a full sequence of events. It also makes recommendations for minimising the risk of water entering the building in the future.

The report’s findings confirm that:

• The peak flow in the Foss on 26 December was extreme, equating to an event with a 0.5% (1/200) probability of occurring each year.

• All eight pumps at the Foss Barrier were working that day at full capacity but the water levels in the Foss continued to rise, by approximately 140mm an hour.

• The Environment Agency’s decision to raise the barrier on the evening of 26 December prevented even more widespread flooding; and delayed the peak water levels on the River Foss by some 18 hours.

Environment Agency staff opened the barrier after water entered the building, forcing them to turn off the electricity supply and the pumps. The report found that a build up of water in the barrier’s underground service tunnel, combined with water flowing through the drainage system, filled the service tunnel until water emerged from the floor access points inside the pumping station building.

service tunnel and new pumps with an increased capacity which will be installed by winter 2016. By the end of 2017 the pumping station will have been raised to ensure the barrier is more resilient in the long term.

Sir James Bevan, Chief Executive of the Environment Agency, said:

I was in York in the immediate aftermath of the Boxing Day floods. I know that every house and business flooded is a personal tragedy. We can never prevent all flooding, but we can and will do everything we can to help reduce the risk to householders and businesses.

I welcome this report, which will help us make the Foss Barrier even more resilient in future to extreme floods and greater flows on the River Foss. The upgrade work, which began in April, will see the pump capacity increase, providing a higher standard of protection for local people.

Work on the Foss Barrier is just one component of a wider programme of work, following the Government’s announcement of £45 million for York. We are taking a catchment wide approach to improve flood resilience in the city, looking at how we can slow the flow in the upper reaches of the Ouse and Foss catchments as well as new flood defences.

Click to read the full report

The report concludes that most of the water that entered the building did so via the service tunnel drainage system through a combination of a leaking construction joint and an access cover which had been opened to pump water out of the service tunnel. The report makes a number of recommendations to minimise the risk of water entering the facility in future.

The Foss Barrier has been fully operational since the end of December. A £17 million upgrade is now underway which will address all the recommendations made in the report. This includes addressing water leaks in the 12

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Flood Risk

Phase two of £32 million Exeter flood defence scheme begins

Phase 2 of Exeter’s multi-million pound scheme to reduce flood risk to 3,200 homes and businesses is now underway after the completion of the first phase.

The £32 million scheme is a partnership between the Environment Agency, Devon County Council and Exeter City Council and will see construction activity around the city over the next 2 years.

The Environment Agency is working with contractor BMM to minimise disruption and is encouraging those who live and work in Exeter to sign up to Exeter City Council’s email updates to find out what is happening and when.

Richard Cox for the Environment Agency said:

This is fantastic news for the city.

Inevitably this will cause some disruption but we hope people understand we need to carry out this work to reduce flood risk to people and properties in Exeter. We will be building the new flood defences in a way which minimises disruption to those living, working and visiting here.

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Construction work started in the Countess Wear area of the city. In order to gain access here, a temporary track across Northbrook Golf Course is going to be built. This means that we can avoid using School Lane and Mill Road and will also reduce how many of our construction vehicles use Bridge Road. The land will be reinstated to its original condition when the work is completed in 2018.

Temporary fencing will also be put up through the Riverside Valley Park to separate vehicles from the public.

This will allow the material excavated during phase 1 works (currently stored on Bromham’s Farm playing fields) to be transported to locations throughout Exeter where we are building new flood embankments.

The majority of the park will remain open to the public during the work this summer.

Investigation work is also being carried out at the Quay to check the precise location of utilities such as power cables and gas pipes.

Construction work on new demountable flood defences will then start in November – avoiding the busy summer season.

Added Richard:

We recognise the Quay is a popular place for residents and visitors which is why we have been keen to plan our work to avoid the busiest time.

Councillor Rachel Sutton, Exeter City Council’s Lead Councillor for City Development, said: We’re pleased that the next phase of the Exeter flood defence scheme is about to start, which will protect over 3,000 properties within the city limits when complete. Working together, the Environment Agency, Exeter City

Flood Risk

Council and Devon County Council have developed plans so that the scheme can be built with minimal disruption to residents and local businesses. Our council officers have been heavily involved with this next phase of the project to ensure the works are in keeping with the city.

The success of partnership working has been seen within the first phase of the project which has provided a haven for people and wildlife within the Trew’s flood relief channel, whilst reducing flood risk to the Quay area.

Councillor Andrew Leadbetter, Devon County Council Cabinet Member for Economy and Growth, said: The scheme has made excellent progress to date and every effort is being made to ensure that this next phase causes as little disruption as possible. The access road off the local highway network will reduce the amount of movements on our roads, which should help to keep Devon moving. The phase 2 work will ensure we have a flood defence scheme which will improve protection for homes and businesses in the city, which is why it was a priority for Devon County Council to invest £3 million in the scheme.

Phase 1 of the scheme got underway in 2014 and saw construction work just downstream of Exeter Quay. The Trew’s flood relief channel and the side spill weir at the top of the channel have been lowered. This increased the flow capacity of the flood relief channel, which will help reduce flood risk during high river flows. The check weir at the downstream end of the flood relief channel will be removed later in 2016 to increase flow capacity further.

Exeter City Council and Devon County Council each contributed £3 million to the scheme. £6 million has come from government growth funding and the remainder is being funded by flood defence grant in aid.

The project offices are located in Bromham’s field behind the changing rooms. People are welcome to visit the offices if they have any questions or would like to meet the site team.

14

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Flood Risk

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15

Flood Risk

CASE 13 tonne long reach excavator working on temporary works for moveable weir structure

Protection against floods in Leeds a First in UK Flood Alleviation

Since the summer of 2015 long reach excavator specialist, WM Plant Hire, has been part of the team tackling the Leeds Flood Alleviation scheme (FAS) assisting its long standing client BAM Nuttall. BAM Nuttall have formed a joint venture with Mott MacDonald (named BMMJV) who have been employed by Leeds City Council to deliver the project.

The Flood Alleviation Scheme

The £45million scheme is one of the largest river flood defence schemes in the country. This will see the provision of flood protection for the River Aire designed to protect against a 1 in 200-year flood event, with construction work in the city centre and Holbeck, extending 4.3km between Leeds train station and Thwaite Mills.

Over recent years a number of ‘near miss’ flooding events have occurred along the River Aire through the city centre of Leeds, West Yorkshire, but on boxing day 2015 Leeds was hit with a significant flood event. The flooding has caused significant disruption to transport networks, resulted in evacuation of residents from waterfront properties and led to considerable economic 16

losses to the regional economy. With no formal flood defences along the River Aire the delivery of this scheme has now become a real priority.

A First in Flood Alleviation in the UK

The Leeds FAS includes a ground-breaking first for the UK with the installation of moveable weirs at Crown Point and at Knostrop, that can be lowered in flood conditions to reduce river levels and the threat of river flooding.

The water flow is regulated by inflating or deflating air bags anchored to the river bed which alter the height of the weirs. Being able to drop the weirs will mean the height of water in Leeds itself can be controlled by letting more water through when required.

The alleviation scheme including these weirs will provide defences for over 3,000 homes and 500 businesses with protection against flood events from the River Aire and the Hol Beck. It will also protect 300 acres of development land and open up key regeneration opportunities in the South Bank area.

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Flood Risk

WM Plant Hire Reach Out

BAM Nuttall selected WM Plant Hire for their specialist long reach equipment back in 2015 to assist with the phase of the works at Knostrop. Their machines were involved with the construction of the new weir including temporary works such as the piling and the placing of rock armour. Following the removal of the existing weir and a section of the island at Knostrop Cut that separates the river and the canal, there was a requirement to reprofile the new watercourse to create a navigable channel with greater water holding capacity.

Mounting the long reach machine on a pontoon was the preferred option given the considerable access constraints.

In April 2016 an additional machine was mobilised for the dredging of the main river channel. Weighing around 30 tonnes this machine had a maximum reach of 18 metres and was fitted with GPS dig profiling equipment to ensure the accuracy of the excavation. With surveys showing more material washed down during the winter floods, it was decided to use a larger machine to increase production. This time a 60 tonne CAT long reach machine with a 20m reach was selected, working from a larger pontoon to load hopper barges. Powerful river tugs would move the barges to an existing wharf structure to be offloaded into dumptrucks and taken to a nearby tip.

Click to view the Crown Point Weir Demonstration

For more information visit WM PLantâ&#x20AC;&#x2122;s website at www.wmplanthire.com

The project is making good progress and is on schedule to be completed in March 2017.

Dredging works in progress at Knostrop Cut

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17

Flood Risk

Trade body concerns over flood assurance standard In February this year BSI announced that they had extended the Kitemark for flood protection products to also cover the installation of Kitemark flood protection products.

The Property Care Association (PCA), the trade association for property level protection measures, along with a wide range of organisations, including the National Flood Forum, has raised concerns that householders could be misled over the capability of flood protection products being fitted to their properties.

A new British Standards Institution (BSI) Kite Mark Installation Scheme ‘fails to provide the necessary assurance to homeowners’ says Steve Hodgson, chief executive of the PCA.

He went on: “The scheme has been written in such a way that it can be interpreted to mean that the installation of a flood protection product can then make the whole property protected with the Kite Mark standard.

“But in truth the scheme can only assure homeowners that a product tested and approved under the Kite Mark scheme has been fitted properly. The scheme cannot reassure homeowners that their homes are protected from flooding.

“As a result, we believe the scheme and the promotional material supplied by BSI is misdirecting consumers who are using government money to buy flood protection that may not work.”

Many manufacturers and installers of flood protection products have their own accreditation systems for the work that they do. This is to ensure that the people installing their products do so properly.

The BSI Kite Mark Installation scheme implies that it is an industry wide scheme, but in fact it has been designed with just one manufacturer, rather than the whole industry. It also implies that a property that has been fitted with these products everywhere is fully protected.

However, it is simply not possible to make these assertions. In the last few months we have seen perfectly good schemes and products overtopped. Where flooding has lasted several hours water has found its way in to a 18

building. One supplier’s products will never be suitable for all eventualities and it is important that people choose measures that best deal with the flood risk, the building construction and the lifestyle of the occupants.

It is also likely that other measures will be required, such as ensuring that water can’t get in to the building through cable entry points or poor pointing.

Like flood defence schemes, flood protection products can never guarantee that a property will not flood, however good the scheme.

So what next?

The PCA says its approach to BSI to address the situation has so far drawn a blank. Mr Hodgson said: “We have made BSI aware of these issues, including the safety risks associated with families thinking they are safe from flooding when they are not, yet nothing has been done to remove the potential for confusion. For the sake of consumer confidence, we call on BSI to clarify the situation.”

Paul Cobbing, Chief Executive of the National Flood Forum said: “BSI standards are meant to provide people with the assurance that they are getting what they think they are paying for. Unfortunately, in this instance the wording is inappropriate; it’s all too easy for people to think that they will be fully protected from flooding, when in reality they are not.

“People who are trying to better protect their homes and businesses have often recently been flooded, are suffering enough stress and trauma already and are vulnerable. BSI knows the problems that this scheme is causing and needs to change its approach.”

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Flood Risk

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The first FLOODEX was a huge success with many exhibitors already committed to exhibiting again in 2017.

An extraordinary 72% of visitors, from the pre-registration questions, stated that they either influenced or made the final purchasing decisions.

FLOODEX is the trade event for flood defence and the water level management (WLM) sector looking at flood defence, prevention, mitigation and drainage.

You can capitalize on two days of networking opportunities, with Floodex bringing together leaders in the Local Authority, Internal Drainage Board (IDB), designers, consultants, contractors and planners with the supply chain and service providers.

www.floodex.co.uk

FLOODEX is not just about flood prevention, but covers WLM holistically, as many believe an integrated approach is needed to future proof Great Britain against the devastating effects of large scale flooding

This is your chance to meet dozens of specialists in the supply chain that deliver products, services and technological solutions to control the increasing risk of flood and future proof against the disastrous effects of flooding.

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Surface Water Management

Surface Water Management

Alex Stephenson,

Alex has 40 years experience in stormwater drainage design and related issues.

As well as being the UK Stormwater Director with Hydro International he is also Chairman of the British Water SuDS focus group. He is ideally situated to keep you up to date with the industry changes and legislation.

If you asked a developer, a planning officer and a consulting engineer for a definition of SuDS, do you think you would get the same answer?

I have a suspicion that their answers might well be significantly different. In a recent parliamentary inquiry into future flood resilience, it was suggested that we have a problem with the definition of SuDS.

If this is true, then how can we hope to use SuDS effectively to protect our infrastructure, property and our environment from flood risk and water pollution, when those who regulate, design and deliver SuDS have different impressions of what they are? Not to mention environmentalists, politicians, academics, proprietary equipment manufacturers like ourselves, landscape architects and so on.

The point was made during an oral evidence session on 25 May to the Environment, Food and Rural Affairs (EFRA) select committee’s inquiry into Future Flood Prevention by Steve Wielebski, speaking on behalf of the Home Builders Federation. He said: “SuDS is 4,000 years old.

There is nothing new about it.” He continued: “The view that we have always taken as engineers others might disagree - is that SuDS just about embraces everything. It can be above ground. It can be below ground.”

In his evidence to the committee Philip Barnes, Director for Land and Planning, Barratt Developments Plc, suggested there could be a “definitional issue”. He pointed out that 67% of Barratt schemes involve some above-ground drainage solutions. “The policy is clear that that is where we should go.” The reasons for not doing so might be because it was not technically possible, or because the planning authority might actually prefer a below-ground solution that enabled more houses to be built, he said.

“A below-ground solution is still sustainable drainage in Barratt language, because we use hydro breaks [sic] to hold back the water from either a natural watercourse or the ground or the public sewers, which is very rare for Barratt. It is still sustainable in the sense that it does not involve any more run-off than the predevelopment condition.”

SUDS – a Matter of Definition?

I acknowledge that these are just short extracts from a thorough and far-reaching inquiry with many expert contributions, which has still to publish its conclusions. However the comments did make me stop to think for a moment about what exactly we mean by “sustainable” in the context of drainage.

Do we mean a drainage scheme is sustainable if it ensures that no more water is discharged from a site than the predevelopment or greenfield rate? In this sense, sustainable means they avoid unnecessary discharge to our already overloaded sewer network.

Or should sustainable be interpreted principally as the use of ‘natural’ or ‘green’ above-ground structures and techniques? Or is a sustainable drainage scheme better described as one that closely mimics natural drainage paths and processes? We might describe this as “Engineering Nature’s Way”, in fact.

At Hydro International, we believe our proprietary stormwater products, such as Hydro-Brake® Flow Controls and the Hydro StormTrain® Series contribute to this process and are sustainable, not least because they do not need power and require minimal maintenance. They can also be used to enable soft-engineered above-ground features.

To look elsewhere for a balanced definition, we could turn to the four pillars of SuDS, as defined in The SuDS Manual (CIRIA C753), suggesting SuDS should aim to achieve not just water quantity, but also water quality, amenity and biodiversity.

To me, the four pillars are the right aspirations for a sustainable outcome, with which few would disagree, although it may not be possible or necessary to achieve that outcome in each case.

However, using the best means to achieve that outcome is an entirely different matter. Seeing SuDS only as above-ground or ‘natural’ can be very limiting and could restrict our ability to encourage their wider use. Equally using only hardengineered, below-ground components may miss opportunities for making our urban environments

Contact Alex by:email: alex.stephenson@hydro-international.co.uk Telephone: 01275 878371

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25

Surface Water Management more liveable, as well as promoting green spaces and wildlife in our towns and cities.

So, a toolbox of components and approaches must be available according to site-specific opportunities, the soil and ground conditions and the topography of a site. There may also be hard choices to be made in terms of land-take and construction costs to avoid making a development unviable.

The Government’s commitment to review SuDS delivery in England was prompted during the progress of the Housing and Planning Bill after pressure to reinstate previously-ditched proposals to remove the developer’s right to connect to the sewer.

But if SuDS are to be mandatory without exception – according to exactly what definition? On the basis of the sustainable outcomes they achieve, or according to the components used?

So, should the Government provide a cast-iron definition as part of its review? Should we have much more detailed and prescriptive technical standards to regulate the use of SuDS components of techniques? (so far the devolved regions all have different responses to this) Should we have more regulation - or less, leaving more to the the judgement of local communities?

It feels like these issues are still not completely resolved. Could it be that addressing the need for a more robust long-term solution to ownership and maintenance for SuDS might be the missing link in achieving a framework that will make matters clearer?

For further details of the EFRA enquiry visit the Future Flood Prevention Inquiry page on the parliament website.

If we get the definitions wrong, there is a danger we could end up applying above-ground SuDS inappropriately without fully understanding their engineering performance and thereby compromising flood resilience.

Contact Alex by:email: alex.stephenson@hydro-international.co.uk Telephone: 01275 878371

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HydroSlide Rivers Flow Control Regulators A proven cost effective technique for controlling flows and alleviating flooding: • • • • • • •

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Surface Water Management

Hydrok pipe work welding, design and fabrication Hydrok / Hydra(SW) have a history of providing engineering solutions for the Water Industry. Our manufacturing services operate within purpose built modern facilities using up to date machinery and include tool room facilities occupying around 8,000 square feet to provide every aspect of precision engineering, with CNC lathes, machining centres, surface and cylindrical grinders, spark eroding, and skilled personnel.

Pipe work manufacture in the Hydra factory

Our general fabrication area occupies over 10,000 square feet, allowing for very large structures to be assembled on the premises. An additional 2,000 square feet is devoted to the production welding of thin wall stainless steel pipe.

Using the latest CNC controlled automatic welding plant Hydrok can rapidly produce welded pipe assemblies to a consistent high quality with full penetration and smooth profile. This area is fully equipped with the most up-to-date welding plant, CNC guillotines, CNC press brakes, rollers and manipulators and overhead cranes.

Hydraâ&#x20AC;&#x2122;s design engineers are equipped to size and specify the pipe work to enable all of our pipe to be manufactured in house utilising the highest quality stainless steel sourced from Outo Kumpu.

In addition Hydrok use extended chassis vehicles built specifically for the transportation of fabricated pipe. Pipe is racked in specially manufactured stainless steel spillages that reduce offloading time, and protect the pipe from impact damage and cross contamination from other types of restraint

Autowelder in operation

Pipe work in specially designed spillage ready to be transported

Should our customers require the production of precise engineering drawings, our in house engineering and design staff are available. These designs are then utilised to produce the final product by our team of skilled craftsmen and coded welders.

For any requirements please contact Hydrok / Hydra (SW) on 01726861900 or sales@hydrok.co.uk

Stacked pipe work at the factory ready for delivery www.fadsdirectory.com

27

Surface Water Management

London Luton Airport installs ground breaking new water management system Paul Tittle, Marketing Manager, SDS Limited “Secretary of State for Transport Patrick McLoughlin MP has praised the £110m transformation of London Luton Airport and the role it will play in meeting the immediate demand for air travel in London, the South East and South Midlands”

London Luton Airport is the first establishment in the UK to be equipped with ground breaking new stormwater treatment equipment, which is set to transform the way in which airports, and indeed all other major infrastructure projects, are able to manage surface water runoff.

SuDS best practice

Sustainable urban drainage systems, or SuDS, are now considered best practice to maximise the many benefits of surface water management, specifically the ways in which water quantity and quality, biodiversity and amenity can be managed together. Through recognising surface water as a valuable resource that can be harnessed, rather than solely as a problem that must be dealt with, SuDS provide real benefits to society and the environment, as well as helping to safeguard against flooding from storm events.

More recent legislative policy, including the 2015 Water Framework Directive (WFD), 2010 Water Management Act and River Basin Act, has placed increasing importance on the ability of SuDS to achieve prescribed Environmental Quality Standards (EQS) on water quality.

Over the course of the next 10 years, the UK Government has put in place milestones by which a series of stringent EQS requirements should be met.

Latest SuDS guidance requires planners to incorporate the management of water quality into their designs, through specifying proprietary devices that enable proactive scheduled maintenance to be carried out.

To date, the primary response to these water quality demands has been to integrate into a “stormwater management system” a series of mechanisms which collectively fulfil a controlled sequence of water collection, treatment, storage and release practices. Above ground, water capture devices such as swales, ponds and wetlands, that provide both enhanced visual appeal and 28

ecological benefits, are combined with underground devices that can further treat, store and control the flow and release of excess water volume to prevent flooding at the surface.

In its latest ‘SuDS Manual (C753)’, the Construction Industry Research and Information Association (CIRIA) recommends the use of such devices in their capacity to limit the amount of silts and attached pollutants from building up in the upper layers of the SuDS system and to mitigate against the ability of pollutant bioaccumulations to remobilise in the event of a surge of water, for example after a torrential downpour.

CIRIA has defined a risk assessment procedure whereby the designer of the water management system will assign risk levels of pollution, which are set according to key criteria such as the type of site into which the system will be installed and the sensitivity of the receiving waters; similarly, each SuDS device will be assigned a mitigation factor. The sum total figure of pollution risks should then be measured against the sum total mitigation figure in order to define the series of devices required. This is the first time that guidance has stipulated the use of proprietary SuDS devices on their own to address and remedy water quality issues.

However, as standards for these devices have not yet been defined and published in the UK, the Environment Agency recommends that their performance is verified against standards which are already widely used in the United States, in the form of the New Jersey ‘CAT/DEP’ and European ‘DIBt’ protocols.

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Surface Water Management

Installation of SDS Aqua-SwirlTM: ‘Due to its light weight and robust build the SDS Aqua-SwirlTM hydrodynamic separator could be lifted and manoeuvred easily into position using excavation plant already on site.’

NJCAT, NJDEP and DIBt

The New Jersey Corporation for Advanced Technology (NJCAT) and New Jersey Department of Environmental Protection (NJDEP) respectively provide a verification and certification process, based on particulate removal rates, for technologies used in the treatment of stormwater in order to meet the legislature and the regulatory requirements of the State of New Jersey, USA. DIBt (Deutsches Institut fuer Bautechnik) is the German Approval body that grants technical approvals for non-regulated construction products and types of construction.]

SDS SuDS

Last year, SDS launched a range of water separation and filtration devices that have been tested and approved at both NJDEP and NJCAT levels. Most notably, these devices are largely of high strength HDPE plastic construction, thereby providing a light weight and low cost alternative to the concrete devices which until now have been the only option available.

In the UK, therefore, SDS’s Aqua-SwirlTM Separator is unique in achieving NJDEP field certification, having been proven to achieve reliable and sustainable performance through both field and laboratory based testing programmes.

Luton Airport surface water drainage strategy

As part of its long term surface water drainage strategy defined in September 2014, London Luton Airport Operations Limited (LLAOL) commissioned Veolia Water Projects Ltd, supported by Mott MacDonald, to develop a surface water management strategy which would address the prerequisites to achieve planning consent for the airport’s further expansion.

LLAOL has subsequently embarked on a systematic programme of facilities and services development that ensures the Airport is able to comply with all current and anticipated future environmental regulations; this will prevent surface water and groundwater pollution in accordance with the objectives of the Luton Local Plan and the National Planning Policy Framework.

Data collected from water quality monitoring conducted at the Airport between 2005 and 2012 identified the main pollution risks from the Airport as oil spills and de-icing chemicals, for which oil interceptors and first flush drainage systems were considered the most appropriate pollution mitigation assets.

As well as providing storage and flow balancing to deal with contaminated surface water runoff, the Airport’s drainage scheme also includes methods to manage acute and chronic pollution events and techniques to continuously monitor the quality and quantity of surface

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Surface Water Management

water runoff from all points of discharge to either groundwater or surface waters.

The measures that have been adopted are based on sustainable mitigation, which balances environmental, social and economic factors. Hazardous substances are prevented from entering controlled waters, whilst nonhazardous substances may enter but should not cause pollution.

The water resource receptors, into which any contaminated surface water may flow, are identified as Luton Hoo Lake (via a Thames Water surface water sewer) and the River Lea, to which UK/EU Environmental Quality Standards have been applied, along with an underlying Principal Chalk aquifer which is monitored against UK Drinking Water Standards for Groundwater.

Luton Airport new SuDS system

Phase 1 of the Airport’s new development programme has included the resurfacing and expansion of car parking areas, extensions to buildings and the construction of a new dual carriageway.

In addition to a known flooding problem that already existed on Airport Way, which provides main access to and from the airport, the main impact of this first phase of development has been the increased risk of flooding caused by multiple new impermeable areas, due in the

main to a new road layout and the construction of a second carriageway. The removal of pre-existing soakaways, installation of additional piping and the diversion of manholes required that a new SuDS system should not only prevent the increased risk of flooding but also protect habitat and amenity by improving water quality.

In late April 2016 SDS installed a new SuDS system to handle surface water runoff from Luton Airport’s extended medium term car park. Five SDS GEOlight® attenuation tanks have the combined capacity to store up to 4,277 cubic metres of water which has first been cleansed by each of two SDS Aqua-SwirlTM hydro dynamic vortex separators, designed to remove approximately 90 to 95% of the total pollutants in the surface water runoff volume.

The system has been designed to series 500 of the specification for highways works and sewers for adoption and follows engineering consultancy Mott MacDonald’s flood risk design for a 1:100 year storm event including an allowance for an additional 20% due to climate change. Surface water drainage is managed in accordance with the ‘Design Manual for Roads and Bridges’ (‘DMRB’), the ‘Manual of Contract Documents for Highways Works’ (‘MCHW’) and ‘Sewers for Adoption Seventh Edition’. Future publications of ‘DMRB’ will recommend SDS Aqua-SwirlTM as the first water treatment system of choice.

How does SDS Aqua-SwirlTM work?

SDS Aqua-SwirlTM separators use gravitational forces to separate out of suspension a diverse range of particulates that are typically found in surface water runoff, in the process removing attached pollutants such as free floating oil, poly-aromatic hydrocarbons and heavy metals. Inspection chambers provide direct access from the surface to the sediment and oils that accumulate in the reservoir enabling their simple and effective long term maintenance.]

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Surface Water Management

Benefits of SDS Aqua-SwirlTM

As well as providing the site with essential control over water quality, of particular benefit to the infrastructure drainage contractor, Whitemountain, has been the robust build and light weight of the SDS Aqua-SwirlTM treatment device which could be lifted and manoeuvred easily into position by excavation plant that was already in use on site and without the need for heavy machinery. Site Engineer at Whitemountain, Brian Fegan, explains: “The installation of a system comprising a device of concrete construction, until now our only option, would have required the use of a 350 tonne crane and most likely, due to the massive inconvenience not just to us but to the airport and local road network, would not have been feasible at all. The Aqua-SwirlTM’s versatility meant that we could design the devices for the specific requirements of this site, without the need for any bends in piping, whilst their inherent strength allowed us to save on time and cost through not requiring a concrete surround. Their compact size and small footprint, together with the lifting supports and straps provided, meant installation was very quick and simple and final placement could be done manually; we needed only a single day in which to dig, position, connect up and back fill.”

Additional benefits of SuDS system

An additional benefit of the SuDS system has been the reduction, to a great extent, in the frequency and volume of the flooding that occurred in the neighbouring Airport Way underpass. Whilst the flooding hazard for both carriageways continues to remain categorised as ‘significant’ for a 1 in 100 year storm event, the severity of flooding across the access route in a 30 year event has been reduced to the category of ‘moderate’ for one carriageway whilst, for a 1 in 10 year event, the second carriageway is deemed entirely clear. Furthermore, for all return periods the hazard remains in place for a maximum of only 2 hours, thereby significantly reducing the duration of restricted access, whilst the installation of a pump, which is able to transfer flows to the SDS GEOlight® tanks, ensures that emergency access can still be gained at all times.

About London Luton Airport

London Luton Airport is the UK’s 5th largest airport carrying over 12 million passengers in 2015, an increase of almost 17% on the previous year. £110 million has been invested over the next 5 years to improve access and passenger facilities both inside and outside the terminal, including rail shuttle bus connections and new and upgraded car parks. This expansion will create circa 10,500 new jobs over the next 15 years and see passenger volumes rise to 18 million. At its current rate of growth, the Airport, which already supports £1.3 billion of economic activity and 27,000 jobs, is anticipated to contribute £2.3 billion to the economy by 2030.]

About SDS

Widely acknowledged as the UK’s leading manufacturer and supplier of SuDS, SDS specialises in engineering innovative and costeffective water management systems and equipment that enable the efficient control, treatment, storage and distribution of water within the storm-, waste- and industrial cooling- water industries.

The company’s expertise lies in delivering water management solutions that recognise both the value and the problems that water can bring, whilst ensuring compliance with legislation and accordance with policy.]

Future SuDS developments

Sufficient capacity exists within the underground storage facility landside to accommodate excess airside surface water runoff, the first flush of which will be highly contaminated with substances such as de-icing chemicals and will be diverted to the Thames Water foul system for treatment. Whilst airside and landside runoff have more typically been considered two entirely separate wastewater streams, LLAOL is developing plans to manage holistically all sources of surface water, including the control of their dispersal, in the most environmentally friendly / ecologically conscious way.

For further information contact

Paul Tittle, Marketing Manager, SDS Limited Mob: 07921 396871; Tel: 01934 751303 Email: paul.tittle@sdslimited.com

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Surface Water Management

Flow Controls Deliver SuDS Design for Challenging Llanelli Housing Development Engineers took a pragmatic approach to designing surface water drainage at Taylor Wimpey’s new Parc-y-Strade housing development on the outskirts of Llanelli, South Wales. Using Hydro-Brake® vortex flow control technology to engineer distributed surface water storage and attenuation across the low-lying, flat site, the development infrastructure satisfies Sustainable Drainage Systems (SuDS) principles.

The high-density development of 355 homes is situated in a coastal plain that could be prone to flooding. The consulting engineers QuadConsult Limited specified 29 Hydro-Brake® Flow Controls to control surface water and manage underground storage across the site.

The area, on the western side of Llanelli town centre, is located near the River Loughor inlet with extensive coastal wetlands and could be threatened by flooding. As a result of the flat topography, drainage flow is a major concern.

To help improve this, the whole site was built up by circa 900mm. Even so, the invert levels of the discharge points are three metres or more below development levels.

Situated on the historic former Llanelli Scarlets Rugby Football Club stadium pitch, the Parc-yStrade site is being built in three phases, each phase discharging separately to the receiving watercourse – the Cille Stream, which was deculverted as part of the development to provide an effective flood mitigation measure for the area as a whole.

Consulting engineer Richard John of QuadConsult developed the detailed drainage solution for the development site:

“It’s a typical coastal plain location with a high water table due to the tidal range and the estuary. Rainfall is about 1150 mm a year, peaking in winter, so an 8.7 hectare site with numerous access roads and impermeable areas will have a considerable amount of water to deal with,” he explains.

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“In such a high-density, flat site, with many hard surfaces, achieving the desired attenuation with a predominantly soft scheme using many ponds would have been difficult and would also have occupied valuable building land.

“In addition, maintenance and adoption of such features can pose a problem to the relevant authorities, who are happier with the known characteristics of engineered drainage.

“We specified the Hydro-Brake® Flow Controls to provide distributed storage and attenuation throughout the site and maintain discharge volume within the planning consent limits.

Hydro-Brake® Flow Controls with their low maintenance requirements are accepted for adoption by Welsh Water, so were the obvious choice.

“The final flow control is a Hydro-Brake® Optimum, which offered the best storage volume to discharge ratio with a limited 450 mm sump depth, allowing us to minimise storage requirements while meeting the 100-year storm event planning criteria, even with 30% added in for climate change.”

Storm water attenuation structures (box culverts and over-sized pipework) have been installed within the adoptable sewer network in order to accommodate the 30 year return period storm event.

A number of modular block storage tanks collect surface water from private roads, roofs and driveways. They are sized to accommodate rainfall events greater than the 30 year return period storm up-to-and-including the 100-year return period event (including an allowance for climate change) and are located under nonadoptable areas.

The storage discharges to the adoptable sewer network via a total of 28 76 mm Hydro-Brake® Flow Controls with a maximum design flow of 3 l/s. The adoptable sewer network collects the surface water and conveys it to the adoptable attenuation structures for temporary storage where a Hydro-Brake® Optimum attenuates the final discharge to the receiving watercourse at a maximum 13.9 l/s/ha to meet the planning requirements.

For more information about the Hydro-Brake® Optimum and other stormwater management products please call 01275 337937, email enquiries@hydro-int.com or visit www.hydroint.com.

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Surface Water Management

Hydro-Brake® Flow Control Series Launch Delivers Comprehensive Toolbox Hydro International is launching The Hydro-Brake® Flow Control Series, a versatile toolbox of precisionengineered devices for surface water, watercourse, foul and combined sewer network control.

Building on Hydro International’s leadership in flow control technology for more than 35 years, the launch unites each product in the series with the reputation for quality and repeatable, high performance embodied in Hydro-Brake® brand name.

Comprising Hydro-Brake® Flood Alleviation, Hydro-Brake® Optimum, Hydro-Brake® Agile and HydroBrake® Orifice, the Hydro-Brake® Flow Control Series provides sustainable, performance-optimised water attenuation and control, whatever the project.

Alex Stephenson, Market Development Director for Hydro International said:

“The name Hydro-Brake® has always been synonymous with rigorous research and continuous product development. The HydroBrake® Flow Control Series now offers designers, developers and contractors scalable, precision flow

control performance for every site and budget – from flows of just a few litres per second up to major flood defence schemes of many thousands of litres per second.

“In all parts of the UK, new regulations and technical guidance are driving forward the implementation of Sustainable Drainage Systems (SuDS) and improved flood defences, while water and sewerage providers are finding their networks stretched beyond the capacity for which they were first designed and constructed. Choosing from the Hydro-Brake® Flow Control Series will help problem-free progress though planning consents, construction and adoption.

“Choosing a Hydro-Brake® flow control means you can be sure of a device that is optimised for throughlife value, to deliver buildable, predictable and maintainable projects.”

The Hydro-Brake® Flow Control Series comprises:

• Hydro-Brake® Flood Alleviation, a highly sustainable, precisionengineered vortex flow control for flood defence from small dispersed schemes to major watercourse control.

Hydro-Brake® The Element of Control

• Hydro-Brake® Optimum, Hydro International’s flagship passive flow control device, independently accredited by both the BBA and WRc, the only vortex flow control for which the head and discharge relationship can be custom www.fadsdirectory.com

engineered for each design, saving space and costs.

• Hydro-Brake® Agile, a floatactivated flow control that achieves a constant rate of discharge, and therefore the minimum upstream storage over a wide range of heads, particularly suitable for constrained sites.

• Hydro-Brake® Orifice, a precisioncut orifice plate that delivers costeffective, precise flow control.

Hydro-Brake® Flow Controls can be supplied pre-fitted in precast, reinforced concrete chambers for quick and easy installation, with the potential to significantly reduce CDM (Construction (Design and Management) Regulations 2015) risks on site.

Designers and developers need to adapt their drainage designs to meet increasingly varied planning and environmental stipulations. Hydro International’s technical team is available to advise on correct flow control selection and design and ensure flow rates and upstream storage requirements are balanced to provide the best-possible drainage performance over the duration of a storm.

For more information about the Hydro-Brake® Flow Control Series, call the Hydro-Brake® Hotline on 01275 337937, email hydrobrake@hydro-int.com or visit www.hydro-int.com.

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River & Wetland Management

River and Wetland Management

Image credits WTML/Edward parker

Shady Characters Needed To Cool Our Rivers Fish in Britain’s rivers are under threat from warmer waters. Cold-water species such as Atlantic salmon and brown trout, are struggling to cope as climate change brings significant increases in temperature.

Today there’s a call for urgent action to Keep Rivers Cool by planting broadleaf native trees alongside river banks, creating dappled shading and stopping water from warming up.

Shade can reduce temperatures in small rivers by on average 2- 3C compared to un-shaded streams; and by more on hot summer days.

Now Keeping Rivers Cool is calling for action. Speaking on behalf of the KRC partnership Diane Millis, from the Woodland Trust said:

“We’re asking people who value our rivers to survey their local river bank, and look at specific areas which may need shade. Landowners, Rivers Trusts, anglers, farmers and ecological groups can all help. “

The KRC partnership is asking groups working in catchment areas to take up the challenge using a practical guide for planting along river margins, available on the Woodland Trust website. The manual gives step by step instructions for planting, species selection and location, ensuring the right balance of shade for fragile river ecosystems.

The Keeping Rivers Cool partnership can provide

landowners and groups working in catchment areas with first hand specialist advice; and the Woodland Trust can also offer generously subsidised trees. Shade maps showing locations along English rivers which are at risk from direct sun and may need more riparian shade can be accessed here via The Rivers Trusts

Brown trout start to die when water temperature hits between 22C – 25C for more than 7 consecutive days.

In hot summers, a small number of sites in the New Forest, have recorded maximum water temperatures over 31 C - warmer than many heated swimming pools.

Some climate predictions indicate water temperatures will exceed the safe thresholds for river fish; and trees alongside riverbanks are a crucial part of the biodiversity of our waterways.

The Trust’s Diane Millis warned:

“Figures show that stocks are already decreasing and if we don’t start taking the temperature threat seriously, iconic fish like salmon, will face even more serious decline. Rivers, and the ecosystems they support, are one of our most valuable natural resources. “

Salmon are already under pressure, from sediment and pollution run-off, barriers to swimming up-river, lower flows and changes in habitat. The annual fisheries report from the Environment Agency show a continued decline in salmon populations, with over 90 % of stocks in England’s principal salmon rivers assessed as being at risk, or probably at risk. At sea, marine survival of salmon

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has nearly halved over the last 20 years; making it more important that their freshwater habitat is improved, and protected.

River and Wetland Management

Already Keeping Rivers Cool schemes are underway in Northumberland, Hampshire, the South east and the North West of England.

Itâ&#x20AC;&#x2122;s not only shade thatâ&#x20AC;&#x2122;s important; woody debris which drops into streams creates cooler patches under the water, which protect fish, invertebrates and plants.

Trees planted alongside rivers also bring other benefits to the natural environment, they help stabilise banks, reduce and slow the flow of flood waters downstream, and improve water quality by filtering agricultural run-off from nearby land. Currently only 17 % of English rivers meet good ecological water quality standards.

Maps & catchment areas

Shade Maps can be found at the Rivers Trust Mapping Portal http://arcg.is/1RlT25H.

From here you can zoom right in on locations (to river level) to see areas of red (least shade). Further information on the fish and ecological status of the river is available by clicking on the patch of red.

The Keeping Rivers Cool partnership is supported by the following organisations: Angling Trust Environment Agency Freshwater Biological Association, Forestry Commission, National Trust, Natural England, The Rivers Trust, University of Birmingham, University of Nottingham Woodland Trust.

Click the cover to view the che guidanace manual 36

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River and Wetland Management

World fish migration day highlights successes

Now in its second year, World Fish Migration Day has gained rapid momentum, with over 1000 organisations around the globe getting involved, and a huge range of events. There will be over 400 events in 60 countries.

Migration is important because many species of fish need to migrate to reproduce, feed and complete their life cycles. They also make up a crucial link in the food chain and play an important role in healthy river systems.

Many migratory fish species are severely threatened. The main are obstacles like dams, weirs and sluices, which disrupt the natural flow of rivers and prevent fish moving along rivers.

More than 20,000km of England’s rivers have been opened up to improve fish migration over the last 4 years – the equivalent distance of London to Rio and back – the Environment Agency reveals on World Fish Migration Day (21st May).

Almost 200 obstructions have been overcome – this means fish passes installed or weirs removed. Migration is important because many species of fish need to migrate to reproduce, feed and complete their life cycles.

Weir removals and fish passes create ‘fish highways’ making a faster, easier route from the sea right up to the upper reaches of rivers. This work benefits coarse fish that spend their entire lives in the river, as well as the species that migrate between the river and the sea, such as eel, salmon and sea trout.

Young eels make an incredible journey more than 5,000km across the Atlantic Ocean from the Sargasso Sea to rivers all over Europe – and adult fish make the return journey to spawn.

It’s not always possible to remove all weirs – for example, many are still being used and can’t be removed if buildings, walls or bridges could be damaged, where the risk of flooding would increase or if there is heritage interest. In these cases fish passes are the solution.

Sarah Chare, Head of Fisheries at the Environment Agency, said:

After considerable investment, rivers in England are the healthiest for 20 years. This is down to more than a decade of hard work to improve the health of England’s rivers.

But there is more to do and opening up our rivers to help fish migrate is a crucial part of this. By working with partners we can play to different organisations’ strengths, make our money go further and deliver more.

The Environment Agency has been working with partners on projects all over the country. One recent success of removing a barrier to migration is a new fish pass on the River Tyne. Here the Tyne Rivers Trust worked with Northumberland County Council and the Environment Agency to build Hexham fish pass which opens up access to many kilometers of spawning and juvenile habitat.

In Yorkshire, the Environment Agency has worked with partners and made significant additions to Yorkshire’s ‘fish highways’ – removing 2 weirs on the River Don in Sheffield and a weir on the River Aire in Leeds. Both rivers are now returning to a natural series of shallow, fast sections separated by deeper pools – which provide a better habitat for the coarse fish, grayling and brown trout that live there and for the invertebrates that they feed on.

In Dorset it is now easier for salmon and sea trout to migrate up some of the county’s best-known rivers thanks to the efforts of a unique partnership that has been working to boost fish numbers by removing man-made obstacles such as hatches and weirs. Improvements at 10 sites on the Rivers Frome, Piddle, Asker and Brit have made it possible for fish to swim upstream to spawning grounds for the first time in many years.

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River and Wetland Management

New fish pass opens up 34km of River Witham A new pass has opened up 34 kilometres (21 miles) of the River Witham for fish and eels, making it easier for them to migrate and spawn.

The £100,000 project took 3 months to complete and was installed after the Aubourn weir, which serves no flood defence purposes, was decommissioned.

The project was completed by Environment Agency framework contractors Balfour Beatty (in conjunction with their sub contractors A&V Squires, WaterCo and Forest Farm Tree Services).

Coarse fish and salmonids like brown trout will have access to more of the river, helping link up isolated fish populations and making spawning easier.

Improvements have also been made to the habitat, providing fish and invertebrates a refuge from high flows and predators.

This work will help boost fish populations and benefit the wider ecology of the river.

Previously, fish could swim freely up the 14km of the River Witham from Stamp End in Lincoln to the Aubourn weir south of the city. But now that the weir has been

removed and a fish pass installed, they can also swim up the next 20km between Aubourn and Claypole.

Nearly 1,000 tonnes of stone – mostly Leicestershire granite – was used to complete the rock ramp, considered the best and most natural means of passage at this location. Boulders and carefully-placed smaller stones form bars across the channel to make it easier for fish and eels to get upstream, with three rows of piling keeping the stone in place.

Your partner in water management and flood control

The CW Group Hamlin Way, Hardwick Narrows, King’s Lynn, Norfolk PE30 4NG T: 01553 775565 E: info@cw-engineering.co.uk www.cw-grp.co.uk

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River and Wetland Management

Bedford Pumps Launches New Improved Website Bedford Pumps Ltd, one of Europe’s leading manufacturers of large submersible and conventional pumps to the water and wastewater industries, is delighted to announce the launch of its brand new website.

The site provides clear navigation and functionality providing users with an enhanced browsing experience. Full information is provided on the company’s range of pumps, accessories and applications, and users are able to download technical data and an array of case studies showing the pumps in operation.

Lucy Ogden, Marketing Manager for Bedford Pumps Ltd comments “The website has been designed to provide an enhanced experience for our current and prospective clients. The new website is faster, much easier to navigate and extremely user friendly.”

To view Bedford Pump’s updated website please visit www.bedfordpumps.co.uk.

For further information please contact Lucy Ogden at lucyo@bedfordpumps.co.uk.

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39

River and Wetland Management

ADC add amphibious workboat to their equipment list Cambridgeshire based drainage specialists ADC have acquired their first Truxor amphibious workboat to extend their services to reed bed control and other tasks beyond the reach of conventional land or water based machinery.

The Truxor DM 5045 is an amphibious vessel with high performance but quiet turbo diesel motor which provides more power to the machine and its various tools, enabling It to cut and collect aquatic weed and reed growth, dredge, excavate, clean up oil spills and more.

Low ground pressure allows it to operate in sensitive areas with minimal impact on the environment making it ideal for work on wildlife reserves and other sensitive areas normally inaccessible to conventional machines.

Being able to simply travel from land to water is a great asset in wetland conservation management.

For more details please contact ADC on 01945 430247 or visit www.adcdrainage.co.uk

adcdrainage.co.uk

Truxor DM 5045 amphibious vessel now available for maintenance work.

THE SPECIALIST DRAINAGE COMPANY

CCTV SURVEYS . JETTING & TANKER OPERATIONS . SILT CLEARANCE RELINING & EXCAVATION . PREVENTATIVE MAINTENANCE ADC EAST ANGLIA LIMITED . Victoria House . Bonnetts Lane . Marshland St James . Wisbech . Cambs . PE14 8JE .

Tel:01945 430247 . Fax: 01945 430737 . info@adceastanglia.co.uk

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®

Water-Filled Dams for river, lake and pond work

Budget Range

For water depths up to 0.7m • Culvert works • Pollution control • Fluming • Shallow channel work

Standard Range

For water depths up to 1.8m • Lake works • Weirs • Locks • Bridge works

VL Range

For water depths up to 3.3m An alternative to sheet piling

AquaDam Europe Ltd

+44 (0) 1793 251 700

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For more information on any of the companies listed please click the link Bio-Engineering

AGA Group

Bio-engineering, Aquatic Consultancy > MORE INFORMATION

Dredging & Silt Removal

ADC (East Anglia) Ltd Drainage service, silt dredging, channel maintenence

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Erosion control & Piling

ABG Ltd

High performance geosynthetic systems for eroion control, stormwater and ground protection > MORE INFORMATION

The Fen Group

Aquaclear Water Man Truxor Weed harvester importers and suppliers

Bio-engineering, Aquatic Consultancy

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Water management, flood protection and civil engineering services

AGA Group

Salix Bioengineering

Bioengineering solutions for erosion, inland dredging, civil engineering, wetlands and habitat creation projects > MORE INFORMATION

Fish & eel Passes

Kingcombe Aquacare

Hytex

Water Management for Landscapes, Fisheries, Leisure and Conservation.

Water Management for Landscapes, Fisheries, Leisure and Conservation.

Geosynthetic and biodegradable materials.

Erosion control, stabilisation

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Land & Water

Kingcombe Aquacare

marine based civil engineering, dredging and remediation projects.

marine based civil engineering, dredging and remediation projects.

Water Management for Landscapes, Fisheries, Leisure and Conservation.

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Flow control, Flood barriers, fish passes, weed control

Ponds UK

construction and management of ponds, lakes, rivers, water courses, reservoirs and water features > MORE INFORMATION

Salix Bioengineering

Bioengineering solutions for erosion, inland dredging, civil engineering, wetlands and habitat creation projects > MORE INFORMATION

Mastenbroek

Herder flail cutters and Conver weedboats and silt pushers > MORE INFORMATION

W M Plant Hire

Long reach plant hire, dredging, engineering and maintenence and restoration projects > MORE INFORMATION

Plastic Pile manufacturers and suppliers > MORE INFORMATION

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Fish pass surveys and installations

Flood Protection barriers

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Floodsax

Flood protection - sandless sand bags

IBS Engineered Products

supply and installation of flow control and flood protection equipment. > MORE INFORMATION

Lakeside Flood protection Property flood protection, barriers, air bricks etc

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Aquatic Control Eng

Flow control, Flood barriers, fish passes, weed control

The Flood Company

Specialist, insuranceapproved suppliers of flood protection products > MORE INFORMATION

AST Floodwall Systems Property level flood protection solutions. Doors, vents, airbricks > MORE INFORMATION

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Flood Control Int

Demountable and permanent flood barriers doors and gates

Fishway Engineering

Ponds UK

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Flood management solutions

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construction and management of ponds, lakes, rivers, water courses, reservoirs and water features

Aquobex

CW group

Designers and manufacturers of weedscreen cleaners

Master Pile

Plastic piling for bank protection and erosion control

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HL Plastics

Suppliers of temporary water-filled flood barriers and coffer dams

Aquatic Control Eng

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Land & Water

AquaDam Europe Ltd

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Kingcombe Aquacare

Directory

Directory

Directory listing is free of charge to FADSâ&#x20AC;&#x2C6;subscribers Flow Control & Pumping

Aquatic Control Eng

Flow control, Flood barriers, fish passes, weed control > MORE INFORMATION

Bedford Pumps Ltd Submersible and conventional pump manufacturers

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ACO Water Management Drainage and water management systems

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CW group

Designers and manufacturers of weedscreen cleaners > MORE INFORMATION

The Fen Group

Water management, flood protection and civil engineering services > MORE INFORMATION

Hambaker Adams

comprehensive range of flow control equipment > MORE INFORMATION

Hydro International

stormwater, wastewater and combined sewer overflow management. > MORE INFORMATION

Hydrok

Land & Water

Flow control and surface water management solutions

marine based civil engineering, dredging and remediation projects.

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IBS Engineered Products

Ponds UK

supply and installation of flow control and flood protection equipment.

construction and management of ponds, lakes, rivers, water courses, reservoirs and water features

JKH

Sweeting Bros

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leading manufacturer of steel reinforced pre-cast concrete products

Land drainage and watercourse maintenance contractors

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Obart Pumps

W M Plant Hire

Water pumps and flood accessories > MORE INFORMATION

Polypipe

manufacturer of surface water drainage, sewerage systems and water management solutions > MORE INFORMATION

River, Lake & Wetlands creation & Restoration

The Fen Group

Water management, flood protection and civil engineering services > MORE INFORMATION

Kingcombe Aquacare

Water Management for Landscapes, Fisheries, Leisure and Conservation. > MORE INFORMATION

Long reach plant hire, dredging, engineering and maintenence and restoration projects > MORE INFORMATION

Surface Water Management SuDS

ABG Ltd

High performance geosynthetic systems for eroion control, stormwater and ground protection > MORE INFORMATION

ACO Water Management Drainage and water management systems

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Hydrok

Aquaclear Water Man

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Flow control and surface water management solutions

Polypipe

manufacturer of surface water drainage, sewerage systems and water management solutions > MORE INFORMATION

Temporary Cofferdams

Truxor Weed harvester importers and suppliers

Mastenbroek

Herder flail cutters and Conver weedboats and silt pushers > MORE INFORMATION

Ponds UK

construction and management of ponds, lakes, rivers, water courses, reservoirs and water features > MORE INFORMATION

AquaDam Europe Ltd

Suppliers of temporary water-filled flood barriers and coffer dams > MORE INFORMATION

Spearhead

Vegetation management equipment > MORE INFORMATION

W M Plant Hire

Long reach plant hire, dredging, engineering and maintenence and restoration projects > MORE INFORMATION

Vegetation Management

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Hydro International

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