Winter 2015:16 by Relbon Limited

The on-line magazine for the water management industry

and its environment

Winter 2015

Clearing large amounts of debris from the Mitford dam in Morpeth after the floods

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Contents

FLOOD RISK

Could Desmond, Eva and Frank top the cost of the 2007 storms?

Environment Agency Chairman Sir Philip Dilley resigns

New ‘Homeowners Guide to Flood Resilience’

Flood defence time for a “Complete rethink”

The cost of Desmond, Eva and Frank

Changes to our rivers and floodplains have exacerbated flooding A new flood partnership in Cumbria and a national resilience review will help to steer flood defence improvements MP's warn that funding cuts must not put flood protection at risk Strategic flood response in Denmark A ‘soft approach’ to flood defence

Scotland's first national flood risk management plan

A unique funding solution for flood alleviation scheme

Time for a rethink?

A million FloodSax … and still counting!

STORMWATER & SuDS

RIVER RESTORATION & MANAGEMENT

16 - 17 21

26 - 27 29

31 - 32

Automatic weedscreen cleaner that ticks all the boxes

36 - 37

Atlantic Salmon return to River Don after 150 year absence

34 - 35

38 - 39

40 - 41

To advertise in Managing Water or list your company on FADS, Contact Mike by email at mike@fadsdirectory.com or Telephone: 0845 2 575 575

General Enquiries content@managingwater.co.uk Tel: 0845 2 575 575

De-silting programme minimises environmental impact

Contact

Return of the Salmon after 150 years

12 - 13

DIRECTORY

SuDS Manual updates gain approval from industry experts

Piling - Sustainable meets practical

Strategic flood response in Denmark

SuDS Technology in action

8-9

Move Flood Defences Upstream with Farmers’ Support

Gloucester services achieve project sustainability requirements

Changes to floodplains exacerbated flooding

6-7

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Published by: Relbon Ltd, Company Reg 07488993 Relbon House, 3, Lake Way, Huntingdon, Cambs, PE29 6SU, UK, admin@relbon.co.uk

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Could Desmond, Eva and Frank top the cost of the 2007 storms? Liz Truss, the UK environment secretary, has announced that the December storms that battered Northern England caused flooding to around 16,000 properties.

Storm Desmond brought flood damage to approximately 7,000 homes and businesses in Cumbria after record rainfall early December and storm Eva resulted in flooding to around 9,000 properties on the 26th December across Yorkshire, Lancashire and Greater Manchester . The Environment Secretary was keen to point out though that flood defences did protect over 20,000 properties from flooding and that since the passing of the storms there has been a huge focus on helping Yorkshire and Lancashire get back up and running.

funds and reinsurance cover being inadequate to meet outgoings. In that event, insurers would be required to make up the difference in the near term, but would then pass on the cost to all households through an increase in annual premiums. To date the Government has pledged close to £200 million towards the cost of recovery. By 9th December £60 million had been pledged by the government to support households and businesses affected by the first devastating floods in Cumbria and Lancashire. £60 million of help for local residents, businesses and farmers with the first payments to local authorities just 3 days after Storm Eva struck.

Clearing debris afetr the floods

The latest estimate by the consultancy firm PwC suggests that the economic cost of the damage could be between between £2bn and £2.8bn, however, £2bn and with flood warning still in place these estimates could £2.8bn rise even further. The current cost of Insured losses incurred through Storms Desmond, Eva and Frank is likely to be up to £1.5bn.

Bank UBS revealed that insurance companies RSA, Direct Line and Aviva are set to make estimated losses at £150million to £308million leading to poor performances on the London stock market, with share prices down 4.2 per cent for Aviva, down 3.6 per cent for RSA Insurance and down 3.1 per cent for Direct Line.

Fitch Ratings have said that the floods are likely to result in an increase in flood defence spending but that failure to keep up the spending could lead to higher-thanexpected claims for the, soon to be launched, Flood Re scheme. A longterm increase in the number of properties at significant risk of flooding could result in Flood Re's

£40 million will be provided via the Department for Transport to help fund repairs to transport infrastructure after roads and bridges were washed away.

£40 million for repairing defences, including £10 million on upgrading the Foss barrier with new pumps to ensure that it can cope with higher volumes of water. The other £30 million will be spent repairing defences on the Wharfe, Calder, Aire, Ouse and Derwent. This will include repairs to pumping and barriers and clearing blockages in rivers. www.fadsdirectory.com

Repairing a flood embankment in corbridge

Flood Risk & Drainage

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Flood defence Time for a “Complete rethink”

Following the widespread flooding the industry experts are saying that a complete rethink on flood defence is is required.

David Rooke, Deputy chief executive, said recently that there must be a review of the way the UK prepares for flooding and protects against flooding. Flood defence spending will not be enough on it’s own, properties must be made more flood resilient and there must be improvements to the flood warning systems so that, in the event of defences being breached, people have time to take action. Professor Dieter Helm, Chair of the Natural Capital Committee and government adviser, has issued a report titled: Flood defence: time for a radical rethink

On the role of the Environment Agency he says that flood defence needs to be put on a stand-alone basis, allowing the EA to focus on environmental protection, structurally seperating out operational, project management, catchment management, regulation and catchment planning functions. Establish new flood defence companies created on a catchment basis (within a single overarching structure or replicating the catchment model that the NRA inherited from the water authorities pre-privatisation).

“flood defence needs to be put on a stand-alone basis”

Dieter Helm

“properties must be made more flood resilient”

David Rooke.

“EA methodolgy can create perverse incentives for developments”

Dieter Helm

The current response to flood events is to use “sticking plasters” instead of genuine reforms to the system and this fails to address the core issues and will only provide a temporary respite.

The economic approach to flood defence

The report suggests that a new approach should be based on the costs and benefits of flood defence investments, discounted back to 6

Dieter Helm, Chair of the Natural Capital Committee and government adviser

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the present. It incorporates risk and uncertainty, and recognises that this optimal level is very unlikely to protect all properties from inundation.

The EA’s methodology is not an economic one. Its risk management strategy focuses on those properties at most physical risk, but this does not provide a sensible way of evaluating what resources should be deployed where and to whose benefit. He says that the EA’s methodology can create perverse incentives. The consequences of the physical most “at-risk” approach are considerable in determining the incentives created for house building and other developments. If buildings are placed at high-risk flood locations, even if advised against then the EA should - on its own methodology - prioritise these new properties for flood risk mitigation.

He adds that house building location can also be incentivised by subsidised flood risk insurance. More attention would be paid to development location if new house-owners faced the full costs of both flooding to themselves, and flooding risk increases to others. Availability of emergency aid, for the same reasons, also encourages the selection of inappropriate locations. The need for explicit planning regulation is all the greater as the government targets a major house building programme. The current planning system allows new houses and other developments to be built in the wrong places, and once built will present a long term and continuing flood management problem. Agricultural policies should also be addressed as they pay little attention to flood risk. In the

Flood Risk & Drainage

Somerset Levels case, the changing farming practices directly contributed to the silting of the two main rivers, and there were demands for dredging to deal with the consequences. Upstream farming practices have contributed to the more recent flood events too. The three step approach:

Step one is to urgently replace the EA’s current appraisal methodology with one based on economics, and thereby shape the incentives for house building and agricultural practices. Flood defence then becomes an integral part of the economics of (natural) river catchments. Step two is to put together an assets register of flood defence investments, and to create a balance sheet. This is precisely what the water industry has had to do, following privatisation. The utilities can borrow against their assets – as long as the debt and equity liabilities do not excess the asset values. The creation of a flood asset balance sheet for each river catchment is a necessary condition for pay-whendelivered investments, and the supporting borrowing. It also helps to identify capital maintenance – to keep the assets in good order.

Step three requires a fundamental organisational restructure. The EA was created with the explicit purpose of providing “Integrated Pollution Control”. Yet ended up being a conglomerate dominated by water and floods. The widely recognised result has been an often poorly managed and poorly focussed organisation.

So where could the funding come from?

Dieter suggests that there are just three possible main answers, with the second and third the more likely:

• The taxpayers. • A river catchment charge - add a flood levy that could be included with water bills. • Insurers and developers - directing funds towards the reduction of risks or offering different premium rates to householders on the basis of the risk avoidance measures taken.

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Environment Agency Chairman Sir Philip Dilley resigns

Sir Philip Dilley has resigned from his post as chairman of the Environment Agency, saying he was not able to meet the “inappropriate” requirements of the part-time job.

Sir Phillip had been the role for just 18 months and came under intense pressure when he failed to appear in public after Storm Eva hit the UK over Christmas. Environment Secretary Elizabeth Truss said that she had accepted Sir Philip Dilley’s resignation and that he has ably led the Environment Agency through some challenging times, leaving it a much better organisation. Chief Executive Sir James Bevan will continue heading up the operational and day-to-day running of the organisation and the current Deputy Chairman, Emma Howard Boyd becomes Acting Chairman with immediate effect. In a statement issued today, Sir Philip said:

I am well qualified to carry out this role, and had much to contribute. I fully support the Secretary of State’s reform agenda to deliver efficiency as well as a better, more joined-up service to our stakeholders and the public, and so I am disappointed that I will not now see through delivery of these reforms.

My reason for resigning is that the expectations of the role have expanded to require the Chairman to be available at short notice throughout the year, irrespective of routine arrangements for deputy and executive cover. In my view this is inappropriate in a part-time non-executive position, and this is something I am unable to deliver. Furthermore the media scrutiny focused on me is diverting attention from the real issue of helping those whose homes and businesses have flooded, as well as the important matter of delivering a longterm flood defence strategy. This same media attention has also affected and intruded on my immediate family, which I find unacceptable.

I want to be clear that I have not made any untrue or misleading statements, apart from approving the statement about my location over Christmas that in hindsight could have been clearer.

The Environment Agency is an extremely competent and well-run organisation, and the many employees I have met are passionate about what they do because they really care for the environment and the communities we work to enhance and protect.

I retain the full support of the board, which I know has a strong breadth of knowledge and experience, and with Sir James Bevan as the newly appointed Chief Executive the future of the Environment Agency is in strong hands.

To read the full report click here

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Flooded, embanked tributary of the River Eden in Cumbria. Credit: Neil Entwistle

Changes to our rivers and floodplains have exacerbated flooding

By , Neil Entwistle, Lecturer in Physical Geography, University of Salford and George Heritage, Honorary Research Fellow, University of Salford (originally published on The Conversation)

The recent and ongoing flooding of urban areas in northern England and the Scottish borders has in part been caused by unprecedented rates of rainfall. However, this is only one of the factors that contribute to the development of a flood wave passing down a river. Centuries of alteration to how our river catchments (or drainage basins) function has undoubtedly exacerbated the risk of downstream flooding in every river area in Britain.

Rivers are inherently variable, but those with floodplains tend to flood in these areas every couple of years with deeper more extensive flooding occurring less frequently. Sometimes riverbeds also deepen as part of a natural adjustment and in these cases flooding would also be less frequent. Most often, though, floodplain inundation has been reduced deliberately through dredging, embanking, straightening and clearing, which concentrates flood flows in a main channel.

These alterations to the landscape have fundamentally altered surface and subsurface flow processes. They include a strategic network of drains and ditches cut by landowners and managers (often with government grants) to improve floodplain land for agriculture to prevent surface flooding and waterlogging, and dredging and embanking which helps to contain flow within a river. Improved drainage in our upland moors through the cutting of a network of drainage channels means that upland precipitation or snow melt is also now concentrated into channel networks more quickly and flows downstream into river valleys faster. 8

All of these interventions move water more quickly downstream instead of capturing it in the soil or naturally inundating valley bottom areas where it flows more slowly. Government plans to relax current rules will see this drainage network extended and improved to the detriment of the main river flood regime and those living and working downstream.

Natural management

Natural flood risk management includes measures to store and slow flow in catchments more effectively with the aim of reversing the long-term trend of moving water downstream as quickly as possible and restoring some functionality to beleaguered uplands and floodplain areas.

No more floodplain as the River Caldew flows into Carlisle. Credit: Neil Entwistle

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It would make sense to try to restore some of the storage function that catchments used to perform before they were so expertly drained. Keeping water in the catchment area for longer means that the flood wave in the river will be longer but at a generally lower level than we currently see during heavy rainfall. This effect has been known from early studies in catchments such as Plynlimon in Wales, and Coalburn and Balquidder in Scotland. The recent floods in the north-west were linked to record rainfall figures – Cumbria, for example, saw 341.4mm of rain in 24 hours. The flooding that occurred in Carlisle in December 2015 surpassed the 2005 event which generated a flood peak that exceeded the one in 200year event that is the standard of protection for the city and followed extreme rainfall in the River Eden catchment area. Rapid deployment of an sUAV (a Small Unmanned Air Vehicle) after the event captured imagery and evidence of the flood’s extent. It revealed that the entire floodplain along the main river and its tributaries was active during the heavy rainfall, along over 60km of surveyed watercourse. This has obvious implications when evaluating the value of natural flood management measures for an event of this magnitude. Small storage measures and obstructions erected in channels, including bed raising and feature restoration such as removing or relocating banks, will have slowed and stored water even though it eventually reached capacity. It is critical that flow on the floodplain is slowed relative to the main channel and it appears from the morphological activity and infrastructure damage across floodplain areas that this was minimal.

Urban flooding

The role of the floodplain would seem obvious in controlling downstream flooding yet it did not prevent flooding in Carlisle. It seems that in big events, attempts to increase the natural physical storage of water in the catchment is not going to stop urban areas flooding – but does this mean that natural flood risk management is ineffectual when it comes to preventing urban flooding during extreme events?

Sadly, we still don’t have answers for this. We simply do not know how much land compaction caused by livestock and farm machinery and poorly-timed planting and cropping has increased surface runoff, how significant or even how extensive our surface and subsurface land drainage network is in relation to flood wave generation, or just how dysfunctional our river floodplain system is.

Data collection

One thing is certain. The floods have left a vast amount of evidence and information in the Eden and other catchments impacted by the recent flooding and we must act to capture these data before they are lost. And national and local government, insurance companies and funding agencies must seriously consider the following as part of their response: The Environment Agency must release all of its flood image archives to allow the role of catchment floodplain inundation to be quantified for all recent and historic floods. This will tell us whether, like the Eden, the floodplain is being fully utilised during extreme events or if physical capacity remains to store and slow floodwater. We need improved flood models that provide a fully integrated whole river and floodplain understanding of flooding. The capacity and data to develop 2D flood models now exist. Such a model would allow for a realistic simulation of catchment interventions such as natural flood risk management.

The impact of land management must be rapidly evaluated across catchments impacted by the recent floods. Drainage efficiency is clearly visible in the catchment areas as they recover from the flooding: compacted soils show signs of erosion and waterlogging; patterns of redistributed sediment shows how flows were concentrated; and we can see how efficiently soil has drained from rapidly drying fields. These data can form a spatial map of areas that can impact the generation of flood flow and could allow the strategic deployment of alternative land management measures. Small-scale, piecemeal natural flood management measures are not the answer to controlling the flooding in Carlisle, and the Eden catchment is evidence of the ever present risk of extreme events. However, large-scale, long-term management of the catchment is exacerbating problems for urban areas downstream. Government ministers talk about appropriate catchment and floodplain management, but this can only realistically be achieved through the development of evidence-based mapping. This offers a clear and focussed way forward that will allow holistic planning of flood reduction measures. We have a near unique and certainly time-limited opportunity to gain a greater understanding of these impacts and must take targeted and immediate action to gather this information before it is lost.

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Flood Risk & Drainage

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The Know Your Flood Risk campaign has launched a new version of its ‘Homeowners’ Guide to Flood Resilience’. The free guide provides advice on how to determine your flood risk, how to plan against flooding, as well as offer guidance on flood resistance measures, appropriate property level flood products and community-based measures.

The guide, which is written especially with the homeowner in mind, hopes to reduce the worry about what property level flood products to use, and illustrates the variety of ways a home can become resilient to being flooded.

Mary Dhonau OBE HonRICS HonDSc, Chief Executive of the Know Your Flood Risk campaign said: “This time exactly 15 years ago, I had flood water in my home – the second flood in only just a few weeks – so I know exactly how dreadful being flooded is, and to be flooded at Christmas time makes it all the more appalling.

Know Your Flood Risk launches new ‘Homeowners Guide to Flood Resilience’

Concludes Mary: “Sadly, flooding is set to get worse and it is essential that we not only know our own flood risk, but prepare in advance and take moves to make our homes more resilient to being flooded. We hope that by launching the new guide it will help inform homeowners as to what can be done to reduce the impact a flood can have and in turn reduce the misery that being flooded brings with it.” Since 2000, Mary Dhonau has vociferously championed flood awareness, preparation and resilience and is a passionate advocate of empowering communities to recognise and take responsibility for minimising their collective flood risk. Mary was awarded an OBE for services to the environment in the Queen’s Birthday Honours list in 2009. In December 2014, she was awarded Honorary RICS (HonRICS) status, in recognition of her high profile in standing-up for the public’s interest regarding flooding. Mary was also given the ‘Voice of the Customer

The Know Your Flood Risk Campaign’s mission is to raise awareness of the risk of flooding from all sources. It is one of the UK’s leading online resources for helping people find out the flood risk related to their current or future homes To download a copy of its free guides visit www.knowyourfloodrisk.co.uk.

A free-to-download Flood Risk mobile app is also available to quickly assess whether a postcode is considered to be at risk of flooding. To download the app from iTunes, click on: https://itunes.apple.com/app/id94161 2469 For more information, visit www.knowyourfloodrisk.co.uk or follow the Know Your Flood Risk campaign on Twitter.

A free-to-download Flood Risk mobile app is also available to quickly assess whether a postcode is considered to be at risk of flooding.

With the announcement of grants for those newly flooded, this guide will be an excellent resource for those thinking about trying to reduce their risk. The prospect of trying to reduce flood risk to your home can be a baffling one, with many people not knowing how to go about this other than resort to the humble and extremely inefficient sandbag. This Homeowners’ Guide is here to help. In addition, for those thinking about installing flood resilient repair, we have an excellent case study, which details the types of interventions that can be made.” 10

‘award and the CII Public Interest Awards 2015 and an Honorary Doctorate from the University of the West of England in July 2015.

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Flood Risk & Drainage

A new flood partnership in Cumbria and a national resilience review will help to steer flood defence improvements

A new Cumbrian Floods Partnership group has been set up to consider what improvements to flood defences in the region may be needed, look at upstream options for slowing key rivers to reduce the intensity of water flows at peak times and build stronger links between local residents, community groups and flood defence planning. The group, who will publish a Cumbria Action Plan next summer, will be chaired by Floods Minister Rory Stewart and made up of local authorities, the Environment Agency and community flood defence groups.

Cumbria bore the brunt of Storm Desmond which led to the flooding of thousands of home but despite the devastation Cumbria would not be beaten and continued with a Christmas Fair in Carlisle and a food festival in Cockermouth.. The group was announced by Elizabeth Truss who said:

“After seeing first-hand the impact of the flooding in the north of England it is clear that the growing threat from more extreme weather events means we must reassure ourselves, and those communities at risk, that our defences, our modelling and our future plans are robust.” The Environment Secretary also announced a National Flood Resilience Review to better protect the country from future flooding and increasingly extreme weather events.

She outlined how her department would look afresh at how we calculate flood risk, in light of recent events, to be delivered by a new cross Government team. This will see Government updating ‘worst case scenario’ planning, considering the future impacts of climate change and carrying out a risk assessment of critical infrastructure, like electricity substations.

The review, also to be published next summer, will be led by the Chancellor of the Duchy of Lancaster Oliver Letwin and include the Government’s Chief Scientist, Defra, DECC, DCLG, HMT and the Chief Executive of the Environment Agency.

The National Flood Resilience Review and the Cumbria Floods Partnership give Government, the Environment Agency and community groups the forums to review and ensure we are directing our resources to protect people most effectively.

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MP's warn that funding cuts must not put flood protection at risk Defra’s budget for day-to-day spending is to be cut by 15% over the next four years. This will be difficult to achieve since total budget reductions of about a quarter during the last Parliament have already identified easily achievable savings and removed the more obvious inefficiencies across the Defra family. Defra is one of the smaller government departments, with Exchequer funding of just over £2 billion, but it performs vital functions. The challenges facing Defra are first whether the reduced budget available to it is sufficient for its task, and second how to make the correct policy choices so as to allocate smaller funds effectively. EFRA, the Environment Food and Rural Affairs Committee has warned that the reduction in DEFRA's budgets over the next four years must not affect vital flood protection work. The MPs want Defra to produce a plan showing how it will deliver vital services in the face of further cuts which will reduce administration budgets by over a quarter and overall resource budgets by 15%. Funding for flood defences

Defra's funding plan relies on the Government being able to secure £600 million from external contributions – of which only £250 million has so far been secured, with only £61 million from the private sector. Committee Chair, Neil Parish MP:

"Defra’s budget reduced by around a quarter in the previous Parliament and the department now faces a further 15% cut by 2020. Savings have to be made, but the Department must prioritise frontline work like flood protection. We have asked the Secretary of State for a clear strategy outlining the impact of Spending Review cuts on vital services. We welcome Defra’s commitment to a six-year capital flood defence programme and its pledge to protect maintenance funding for activities such as river dredging. This is prudent investment since flood damage may cost more to repair than to prevent. But the increasing risk of more extreme flood events will stretch these budgets thinly."

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Flood Risk & Drainage

Strategic flood response in Denmark content@managingwater.co.uk

The people of Denmark understand, better than many, the perils of being a low-lying island. Denmark consists of the Jutland peninsula and more than 400 islands. The whole of the country is lowland and the coastline has a length of more than 7300 km. To protect low-lying land against flooding and storm surge, dikes and permanent installations have been built along about 1800 km of the coastline but much remains open to flooding.

The EU Directive on the Assessment and Management of Flood Risks, which took effect in 2007, stipulates that for every designated area, flood maps showing the extent of damage, inhabitants effected and potential economic and environmental damage must have been in place by end 2013. These maps form part of the flood risk management strategy that had to be drafted by the end of 2015 setting adequate targets for managing flood risks. The Danish Emergency Management Agency (DEMA), is the Danish governmental agency under the Ministry of Defence, with overall responsibility for disaster management. DEMA has six national fire and rescue centres that provide assistance to the police and fire and rescue services in major personnel-intensive emergencies or in situations requiring special equipment. Each centre has 60-65 conscripts and 40-100 volunteers.

For major flood incidents, DEMA can rapidly upgrade its strength with up to 1150 conscripts, officers and volunteers so a straight forward system, training and information flow is vital.

In 2014, as part of the national flood response programme, DEMA invited companies from across to Europe to tender for the national framework contract for the supply of temporary flood protection.

DEMA requirements in brief

DEMA required mobile flood barriers capable of operation over a broad variety of ground conditions to be used in both rural and urban environments – any barrier must operate over kerbs, inclines and dips and be able to bend through 90o.

Key features for DEMA: • Must retain up to 80cm of flood water • Multi-terrain operation • Ease of handling and storage • Portability • Rapid installation within set time constraints • Comprehensive training

DEMA awarded the framework contract to AquaDam Europe, supplier of AquaDam, which satisfied all requirements and in December 2014 ordered the first kilometre of AquaDams. The AquaDams are flood optimised 80cm MFD (Maximum Flood Depth) in 25m lengths for ease of handling and can be joined to form single length barriers if required. All pipes and connectors are pre-inserted ready for immediate response and rapid installation.

Whilst DEMA holds it’s own stock of AquaDam all authorities under the Danish Ministry of Defence and the Municipal Fire and Rescue Centres can stock their own supply under the framework agreement. The first kilometre was delivered in January 2015 and was immediately called into action. The AquaDams proved instantly successful and DEMA have since ordered a second kilometre of 25m dams along with several 50m AquaDams and training dams.

Night time deployments in freezing conditions by a team of responders

DEMA’s portfolio of AquaDams are stored in a variety of locations on storage racks ready for deployment.

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Flood Risk & Drainage

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DEMA recognised the key attributes of AquaDam and have worked closely with AquaDam Europe in the development of the training methods and manuals which has resulted in an extremely effective flood response mechanism.

Training and understanding is key

DEMAâ&#x20AC;&#x2122;s training dams ensure that flood responders across the country have the benefit hands on practical training as well as classroom training.

DEMA AquaDams in use

DEMAâ&#x20AC;&#x2122;s AquaDams have been deployed on many occasions with great success. DEMA have developed an effective response strategy to deal with the regular threat of flooding using AquaDam as their chosen solution. Preparation is a key factor that enables the Danish emergency response mechanism to operate so efficiently and effectively to flood threats. Day or night, in wet and sometimes freezing conditions, the required number of AquaDams are dispatched to threatened locations and the, well trained, deployment teams are called to action.

The Danish flood response plan provides an excellent template for use across any country or region that suffers from flooding. Combined with a barrier system that is straight forward, reliable, flexible and adaptable, positive steps can be taken to minimise disruption and damage.

AquaDam Europe works with all AquaDam users to maintain a high level of product knowledge, undergo periodic practical training and share their experiences with other AquaDam users to best serve communities at risk of flooding.

For more information onAquaDam go to: www.aquadam-europe.com/floodprotection.html

The same AquaDam could be in a field one day and protecting commerce and business in a town on the next

Flood alert!

When called upon, the Danish emergency response leaps into action, like a well oiled machine. AquaDam Installation Plans detail the number of AquaDams, number of pumps, the locations and the teams involved are put into action.

Each deployment team knows where the AquaDams are going, how to prepare the site, what limitations or restrictions they may face and how to deploy the dams quickly and effectively. Deployments teams can operate in small numbers with one trained operative.

The ability to quickly respond to changing events is essential

Deployment in a rural location ready to hold back flood waters

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AquaDam being deployed over Christmas 2015

The tactical solution for flood water control

For over 25 years AquaDam have been manufacturing and supplying water-filled dams for ...

• Flood Diversion

• Flood Containment & Retention • Perimeter Flood Protection • Highway Flood Protection • Tactical Flood Response In bespoke lengths for flood depths up to 1.8m

AquaDam Europe Ltd

+44 (0) 1793 251 700 sales@aquadam-europe.com www.aquadam-europe.com Aquadam Europe Ltd is the European distributor for AquaDam.

Flood Risk & Drainage

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Liniar’s Log Piling has provided the perfect solution to prevent flooding on this Devonshire property.

A ‘soft approach’ to flood defence After a horrendous storm left his Devon property flooded and damage-strewn, Paul Nickels faced the task of finding a solution to prevent the catastrophe ever being repeated – but was determined to take the ‘soft approach’ in doing so.

After long consultations with the Environment Agency, Paul agreed to allow a man-made stream to run through the outskirts of his property and into the River Otter, therefore preventing a repeat of the devastating flood. In order to do this Paul needed to build a retaining wall and began researching piling on Passivhaus, initially looking to use timber. It was during his investigations that he came across plastic piling and was immediately impressed by its lightweight, easy to handle qualities. Delving further, Paul discovered Liniar’s 100% recycled, lead-free range and made contact to enquire further. It was in conversation with sales director Mark Sims that Paul was informed of Liniar’s newly-launched Log Piling product and quickly realised that this would be the best way forward to meet his particular needs and would be much more aesthetically pleasing.

The fact that it had a ball-and-socket joint, allowing enough movement in the intersections to make installation much easier, sealed the deal and he put in his order.

After personally redesigning the Environment Agency’s original plans for the stream, Paul began work on constructing the 1.1 metre high retaining wall and for additional strength filling each tube with concrete.

Paul explained,

“The log piling solved the problem nicely, It’s a flexible, yet tough, product so it’s worked perfectly for my purposes.

I wanted to sort out the issue using a ‘soft approach’ rather than build a concrete wall. Timber isn’t the product it once was, unless you pay top prices, and the plastic log piling is perfect because it doesn’t rot.” Liniar’s Log Piling is unique in its construction. Unlike many other piling solutions it’s designed to be fitted above ground rather than being driven in and timber or metal stakes can be driven through the hollow tubes and into the ground to provide stability.

Manufactured in the UK from 100% recycled plastic, the Log Piling is resistant to rodent and marine borer attack, it can be easily cut or bored, is resistant to the majority of chemicals, isn’t affected by salt water and, being lighter than steel, is easy to handle and transport. All-in-all, Liniar’s Log Piling is an ideal solution to a wide variety of piling problems while offering a much more appealing, natural appearance.

Liniar can be found at www.liniar.co.uk and contacted on 01332 883900.

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Flood Risk & Drainage

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Scotland's first national flood risk management plan Environment Minister Aileen McLeod has launched a £235m flood risk management plan for the next 5 years in Scotland. The management plan includes a separate strategy for each of the 14 identified Plan Districts in Scotland.

The strategies explain what causes flooding in high risk areas as well as the impacts when flooding does occur. They will coordinate the efforts of organisations that tackle flooding and concentrate this work to where the risk of flooding and the benefits of investment are greatest. Through this risk-based and plan-led approach the strategies aim to improve flood management for individuals, communities and businesses at risk in Scotland. Environment Minister Aileen McLeod said Dr McLeod said:

“Having met with many people who have seen their homes and livelihoods damaged due to flooding over recent weeks, I am all too aware of the devastation that flooding can cause. “This shows exactly why Scotland’s first national flood plan is an important and necessary step forward. Our plan is designed to improve the way we tackle the risk of flooding across the country – protecting more homes, businesses, communities and livelihoods.

“For the first time, we have a nationwide plan, informed by local communities to tackle flooding. This will be at the heart of our efforts to prevent flooding and there is no doubt it will make a lasting contribution to flood risk management in Scotland.

The first national flood risk strategy for Scotland identifies 42 flood protection schemes that will help protect up to 10,000 properties. The 42 schemes identified are as follows:

Arbroath - Angus Council The proposed river flood protection scheme will address flood risk from the Brothock Water and include improvements to flood defences and the construction of two flood storage areas. Coastal flood protection works will be phased in by the council. The scheme will provide a 1 in 200 year standard of protection.

Bridge of Allan - Stirling Council The scheme would consist of flood embankments and sheet piling to protect properties from the 1 in 50 year event. Broughty Ferry - Dundee City Council The scheme will include new sea walls and set-back embankments, sand dune replenishment and rock armour. It will provide a 1 in 200 year (plus climate change) standard of protection.

Broxburn Liggat Syke - West Lothian Council This scheme would complete the Broxburn flood prevention scheme. It would consist of two flood storage basins in the catchment of the Liggat Syke and provide a 1 in 100 year standard of protection. Callander - Stirling Council The scheme would consist of flood embankments and protect the Meadows car park and residential properties from the 1 in 50 year event. Camlachie Burn - Glasgow City Council The proposed work includes diversion of extreme flows and watercourse restoration to remove a

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substantial network constraint close to Biggar Street. The flood mapping for the Camlachie Burn should be revised to include all elements of the scheme to understand any remaining residual risk now and in the future. Campbeltown - Argyll and Bute Council Feasibility studies indicate that the scheme should include temporary storage of flood water on two burns plus a relief culvert in the town to a standard of 1 in 200 years. There have been a number of floods in Campbeltown in recent years including incidence of sewer flooding which the scheme should contribute to reducing. The detailed design should also include consideration of runoff reduction (woodland planting, land management techniques) and the creation of wetlands and ponds. Caol and Inverlochy - Highland Council This scheme is undergoing detailed design work with a 1 in 200 year standard of protection, including an allowance for climate change. The scheme includes sections of embankments, sheet piled and concrete retaining walls, and rock armour revetments along the embankment to reduce wave overtopping and to protect against erosion.

Comrie - Perth and Kinross Council This scheme would reduce the combined flood risk from the Water of Ruchill, River Earn and River Lednock. It would consist of flood defences and flood storage areas and provide a 1 in 100 year standard of protection.

Flood Risk & Drainage

Dalry, Kilbirnie and Glengarnock - North Ayrshire Council It is recommended that the council progress work on the proposed flood protection scheme on the upper River Garnock. The proposed scheme, consisting of storage and direct defences, would provide protection to properties in Dalry, Kilbirnie and Glengarnock from the River Garnock, Powgree Burn and Rye Water. Drumnadrochit - Highland Council A flood protection scheme in the form of direct defences is under development for Drumnadrochit to reduce flood risk from the River Enrick. The scheme is being designed to a standard of 1 in 200 years. It will be complemented by further investigations of the potential for natural flood management on the tributaries upstream of Drumnadrochit.

Dumbarton Gruggies Burn - West Dunbartonshire Council It is recommended that the council progress preparation work on this scheme. Further design work is required to refine the preferred option for the scheme, which at present is to maximise upstream flood storage and construct defences from Hunter's Burn to Castle Street, and downstream of Castlegreen Street, to address coastal flooding. In addition to these actions the use of property level protection within the scheme should be investigated. Dumfries - Dumfries and Galloway Council It is recommended that the council progress work on the Whitesands scheme. Further work on the design of the scheme is still being carried out. The identified design should look to promote the most sustainable combination of actions, enhance the local amenity value of the river while taking account of the local concerns including construction of flood defences along the River Nith.

Dundee - Dundee City Council The scheme will include set-back walls and flood defences. The construction work to raise the sea wall at the Central Waterfront is to start in 2015/16. The scheme will provide a 1 in 200 year (plus climate change) standard of protection.

Edinburgh (between Balgreen and Longstone and Veitch's Square and Murrayfield) - The City of Edinburgh Council Flood protection works have been proposed for Edinburgh to further reduce flooding from Water of Leith. The proposed works will likely include Coltbridge, Gorgie and Saughton. Grangemouth - Falkirk Council This would include the River Carron, Grange Burn, River Avon and the Forth Estuary shoreline. The scheme would consist of flood defences, sediment management, tidal barriers/ gates and natural flood management and would provide a 1 in 200 year standard of protection. Implementation of this scheme is likely to span a 10 year period from 20172027. Greenock Coves Burn - Inverclyde Council The work would involve a number of conveyance modification actions including: upgrading of culverts, construction of a new connection chamber and tidal valve. Greenock Bouverie Burn - Inverclyde Council Work should be progressed as per the Greenock Flood Protection Scheme. The work involves a number of conveyance modification actions, along the Bouverie Burn.

Haddington - East Lothian Council This would reduce flood risk from the River Tyne. The scheme would consist of flood defences, possibly in combination with natural flood management. Hawick - Scottish Borders Council The scheme would consist of flood defence walls and embankments to provide protection to the town from flooding from the River Teviot. Scottish Borders Council is also looking at flood-proofing specific buildings and the provision of storage and pumping of seepage flows. The scheme would provide a 1 in 75 year standard of protection.

www.managingwater.co.uk Huntly - Aberdeenshire Council A flood protection scheme has been confirmed and is being progressed to construction on site to reduce flood risk from the River Deveron and the Meadows Burn. The scheme includes a combination of improved conveyance using replacement culverts, construction of embankments and temporary flood water storage and has been designed to a 1 in 200 year standard of protection including an allowance for climate change. Kilmacolm Glenmosston Burn - Inverclyde Council The works include upgrading a culvert at Market Place and a new overflow pipe at Gowkhouse Road. A separate natural flood management study is being carried out in the area which may identify additional actions that could be included within the flood protection scheme.

Kirkintilloch Park Burn - East Dunbartonshire Council The works will include the profiling of the channel and provide scope to improve the ecology and morphology of the River Kelvin in addition to the flooding benefits. The proposed works could offer protection up to a 1 in 75 year flood. Kirkwall - Orkney Islands Council A flood protection scheme is under development for the perimeter of the harbour in Kirkwall. The scheme will complement existing defences to reduce the flood risk. The scheme includes the construction of direct defences and is being designed to a 1 in 200 year standard of protection including an allowance for climate change. Langholm - Dumfries and Galloway Council The Langholm Flood Risk Assessment has been completed which identified potential works within Langholm, including construction of flood defences along the River Esk and Wauchope Water.

Millport Coastal - North Ayrshire Council A flood risk assessment and economic appraisal have been developed which have identified options to manage flooding in the area. The current option includes the creation of a breakwater with flood walls. These will also protect against wave overtopping and erosion. Millport Mill Burn - North Ayrshire Council Initial remedial work has helped to reduce the level of risk in the area however further analysis should be carried out to establish the remaining level of risk and the most sustainable combination of actions to manage this risk. Milnathort - Perth and Kinross Council This would address surface water flooding. The scheme would consist of pumping stations and provide a 1 in 100 year (plus climate change) standard of protection.

Musselburgh - East Lothian Council This would reduce flood risk from the River Esk. The scheme would consist of flood defences and earth embankments and would provide a 1 in 200 year standard of protection.

New Cumnock - East Ayrshire Council Previous flooding and the New Cumnock Flood Study have shown a risk of flooding in the area and identified actions that would help mitigate the risk, including construction of flood defences along the Afton Water and Connel Burn and sediment management along the Afton Water.

Newmill - The Moray Council A flood protection scheme has been confirmed and is being progressed to construction on site. It includes a network of ditches to the north of Newmill, a cascade, flood walls and a replacement bridge. It has been designed to a 1 in 200 year standard of protection including an allowance for climate change. Newton Stewart - Dumfries and Galloway Council The Newton Stewart Flood Study identified potential works, including construction of direct defences along the River Cree and Penkiln Burn. The study is being further refined to consider actions that increase the level of protection offered. This includes raising of a

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footbridge over the River Cree in combination with increased direct defences.

Quarriers Village - Inverclyde Council It is recommended that the council looks to progress the flood protection scheme proposed for the Gotter Water in Quarrier's Village. Inverclyde Council have completed a study which investigated the creation of embankments on the south bank of the watercourse upstream of Quarrier's Village, with flood defence walls downstream of the embankments on both banks along the reach.

Scone - Perth and Kinross Council A flood protection scheme has been proposed for the Annaty Burn in Scone. The preferred option consists of raising existing footbridges and constructing riverside defences. The scheme would provide a 1 in 200 year standard of protection.

Smithton and Culloden - Highland Council This scheme is undergoing detailed design and consists of the replacement of culverts, sediment and debris management and temporary flood storage. The scheme will protect communities affected by flooding on a number of occasions in recent years and is being designed to a 1 in 200 year standard of protection including an allowance for climate change. South Fords - Comhairle nan Eilean Siar This scheme aims to reduce flood risk on South Uist as well as the southern coast of Benbecula. The scheme will likely include the construction of embankments, beach recharge at Gualan Island, sand dune/machair restoration and may also include property level protection for any residual risk. The flood protection scheme would be constructed to a standard of 1 in 100 years (locally 1 in 200 years) and will include an allowance for climate change. An option to relieve flooding by creating larger openings in the South Fords causeway is also being considered by the local authority. South Kinross - Perth and Kinross Council This would address flooding from the South Queich, Gelly Burn and Clash Burn. The scheme would consist of flood defence walls and provide a 1 in 200 year (plus climate change) standard of protection. St Andrews - Fife Council This scheme has been proposed for the Kinness Burn in St Andrews. The scheme requires detailed study and design. Stirling - Stirling Council The scheme would consist of flood embankments and would provide a 1 in 200 year standard of protection. The scheme has a low benefit to cost ratio, but has been identified as the only option for Stirling.

Stonehaven - Aberdeenshire Council A Flood Order was published in July 2015 with a flood protection scheme undergoing detailed design to reduce flood risk to Stonehaven from the River Carron and Glaslaw Burn. The scheme will include a combination of new culverts and alterations to bridges, removal of weirs and installing trash screens and the construction of direct defences. It is being designed to a 1 in 200 year standard of protection including an allowance for climate change.

Stranraer - Dumfries and Galloway Council The Stranraer Flood Protection Works is split into different items. The first will help to alleviate flooding to properties in the Ochtrelure area, by increasing hydraulic capacity issues at the head of the system. The favoured option includes diversion of flows. The second item of work is concerned with flooding on the Town Burn mainly downstream of the railway culvert. The preferred option for the Station Road area is to regulate flow passing through the railway culvert and therefore alleviate flood risk in this area. White Cart Water - Glasgow City Council This scheme is an extension of the existing defences, and will increase the level of protection to a number of properties along parts of the Auldhouse Burn and White Cart Water. The proposed scheme includes building flood walls in locations where properties are still identified to be at risk.

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Flood Risk & Drainage

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Flood Risk & Drainage

A unique funding solution for flood alleviation scheme

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In February 2014, flooding caused damage to 79 properties on the Willows Estate, Aylesbury. The event was the result of a combination of surface water and flooding from the nearby brook.

The 79 residents, entitled to receive £5,000 payments towards flood proofing their properties, decided to pool the funds in order to fund a scheme to fund a large scheme that the whole community of 450 homes would benefit from.

A steering group was formed, chaired by County councillor for Aylesbury West, Liberal Democrat Steve Lambert and made up of residents, county, district and town councillors, council officers, Thames Water and the Environment Agency. An emergency flood defence barrier that stretches for almost half a mile and which can be deployed by residents, has been bought with a £340,000 repair and renewal grant from the government. The temporray barrier solutions were provided by AquaDam Europe, a water-filled temporary flood barrier complete with all pumping equipment and Watergate flood barriers.

Six mobile pumps, supplied by SPP Pumps, two of which will clear enough water to fill 120 bathtubs every minute, will be kept on standby at the county council’s nearby Griffin Lane depot. A large metal trash screen has already been installed across nearby Stoke Brook to catch debris flowing downstream that could cause a blockage.

Strategic Flood Manager, for Buckinghamshire County Council, Alex Back explains:

“Normally, we wouldn’t be in a position to make such a capital investment in equipment but when the Willow residents backed our proposal to pool the fund, it gave us the ability to give our whole area protection and not just the properties that flooded in 2014. Steve Lambert Chair of the Steering Group

The conditions that caused the floods, a combination of river levels and surface water, are probably a one in 30 year occurrence but it’s good to know that if the same event happens again we have the equipment on hand to give our residents the protection they need.”

Steve Lambert, who chaired the steering group said: “Everyone more than pulled their weight to work together to reach a good solution.

“Permanent flood defences would have been prohibitively expensive, but I believe we’ve got the best emergency defences for the money available. “I believe we were the first to ask the government whether we could pool the individual repairs and renewals grants to each of the 79 householders, so that the whole community of 450 homes would benefit.”

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Flood Risk & Drainage

content@managingwater.co.uk

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Councillors have approved a sandbag policy which says the council will NOT provide sandbags to protect private property.

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“People need to be prepared. Councils will not come to their aid but many people still think they will and when that realisation hits home it’s then too late.” 22

The Grimsby Telegraph recently reported that North East Lincolnshire Council has warned residents and business owners they must do more to protect themselves against flooding.

The move follows the flood events of summer 2014 which affected much of Grimsby. Clr Dave Watson says the council did not have a clear policy on issuing sandbags, leaving people confused.

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to supply sandbags and owners are legally responsible for protecting their own property from flooding.” Steven Coe, the council’s land flood risk management officer, said: “A better approach is to inform people what their flood risk is and what measures they can take.”

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It’s time to change the paradigm of flood defence thinking and move more fluvial flood defences upstream.

As the grey clouds start to clear, I would urge some ‘blue sky’ thinking that takes a holistic approach to flood defence planning. In low-lying towns and cities, such as many of those hit in the recent floods, it’s already too late when water from the surrounding uplands has raced down highland slopes to the valleys below. As a review begins into the effectiveness of flood defences that were unable to fully protect thousands of homes from flooding, one reliable and innovative technology is already helping to shield flood-prone communities using an approach that challenges conventions. Hydro-Brake® flood alleviation technology holds back river water in the hills above low-lying towns and cities could help prevent future misery as climate change makes severe and intense events more likely. Precision-engineered upstream schemes are already successfully protecting downstream communities from flash flooding.

In the first week of the New Year, UK Environment Secretary Liz Truss and Neil Parish, Chair of the EFRA committee, both seemed to suggest that providing positive rewards for farmers for managing temporary flood storage areas upstream of vulnerable areas could be encouraged as part of a review of flood defence thinking. (BBC News: Farmers in England could be paid to let land flood ; ITV News West Country MP argues for famers to be paid to store water. )

Environmentalists have long argued for more tree planting and green solutions upstream, but alone they may be insufficient to cope with flash floods like those experienced this winter. Proven vortex technology such as that used in the White Cart Water flood alleviation scheme in Glasgow is already helping to protect vulnerable communities, by using an upstream solution that uses no power, requires minimal maintenance and creates wetland biodiversity.

I make no apologies for being proud of Hydro-Brake® Flood Alleviation technology. We should be prepared to shout passionately about the best infrastructure engineering knowledge already available to alleviate flooding misery.

Move Flood Defences Upstream with Farmers’ Support Defences based on Hydro-Brake® Flood Alleviation technology have so far prevented over £200million of flood damage to 6,000 properties. When combined with a range of measures as part of an integrated catchment approach, holding back floods upstream makes perfect sense. Innovative engineered solutions can be combined with natural features to avoid flash flooding downstream. At the time of planning the White Cart scheme, it was recognised that just building defences along the river’s urban banks alone would have required flood walls over two metres high, which would have been a hugely disruptive construction project and have closed down the natural river system in the some places.

Instead, three upstream flood storage areas were constructed on agricultural land in the highlands above Glasgow with a capacity to hold up to 571 million gallons of flood water. At the same time they provided 90,000m2 of wetland habitats. As part of the scheme design, plans were made to enhance biodiversity and wildlife habitat of the area with the creation of woodland, scrub, and species-rich wet grasslands, shallow scrapes and ponds and other artificial habitats.

The flood storage is held back by three dams using Hydro-Brake® Flood Alleviation vortex flow controls, which can be designed to precisely calculate the capacity and reach of upstream storage areas. While the Glasgow scheme is the largest, housing the world’s largest Hydro-Brake® Flow Controls, many other smaller schemes around the country are using the same principle to hold back river and watercourse flooding successfully. One of the biggest advantages of the cone-shaped vortex flow control technology is that it comes into operation automatically as the river levels rise. There is no power needed, no-one needs to be there to operate the flood defence in an emergency, and there are no moving parts or electrical systems that could fail. Another advantage is that the custom design and performance characteristic of the Hydro-Brake® Flood Alleviation flow control can reduce the volume of flood water to be stored by up to 30% compared to fixed orifice controls; reducing land take during storm events. Let’s galvanise our efforts and harness science and technology to work in harmony with nature.

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

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Stormwater & SuDS

ACO HELPS GLOUCESTER SERVICES ACHIEVE PROJECT SUSTAINABILITY REQUIREMENTS

Notorious as functional fuel stops, Gloucester Services is seen to be raising the bar for motorway services; it provides a means of creating sustainable income, which goes back into the local communities. With sustainability high on its agenda, ACO Water Management’s surface water management products have helped create a sustainable drainage system that controls rainwater runoff while providing a high quality habitat for wildlife to flourish.

ACO worked with project designers BWB Consulting Engineers, and Principal Contractor, Buckingham Group Contracting Ltd. to deliver a sustainable drainage system that is able to cope with extreme weather events, while enhancing the environment through maximising biodiversity and creating amenity areas to be enjoyed by all.

The manufacturer became involved with developing the design of the parking and access areas, as well as the landscaping which serves as attenuation for rainwater; supplying a selection of products including Kerbdrain and its acclaimed Qmax slot drainage system. 26

Tim Jones, the Principal Engineer for BWB has described it as the best project he has ever worked on, and commented: “I've been lucky enough to work on a number of prestigious projects in my time at BWB, but my favourite project so far would have to be the proposed Gloucester Gateway Motorway Services Area off the M5 which is nearing the end of construction.

GGMSA is a beautiful scheme on the edge of the Cotswolds with an extensive array of sustainable drainage, with features including green roofs, swales, bio-retention areas, filtration strips ultimately discharging to a proposed pond and wetland area. As far as motorway service areas go this has to be one of the best.” The drainage strategy took a holistic approach, which linked together an extensive array of sustainable drainage features. For this, the solution has encompassed not just an integrated selection of standard and modified drainage solutions, but also a continuing involvement with the consultation and design process. The latter began back in May 2013 when the

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Buckingham Group supplied drawings to the manufacturer, requesting a site visit. This followed on from the two companies’ successful cooperation on the Michaelwood Service area, also on the M5.

Responding to the extensive scale of Gloucester Services and its SUDS system, ACO Water Management supplied 87 one metre long sections of its widely specified Kerbdrain, a combined kerb and drainage system, plus a further 720 of its matching 500 mm units, plus rodding eyes and gully tops.

Specifically designed and developed to form an integral part of any modern, sustainable surface water management solution, Kerbdrain is the first of its kind to use recycled materials and be independently certified and Kitemarked to BS EN 1433: 2002. The one-piece system is suitable for a wide range of applications including major and minor highways, car parks, and commercial and urban landscaping. For this project, the product was installed in the car park of the service station.

The design also called for 150 metres of ACO’s revolutionary Qmax 350 drains in two metre lengths, with integrated Ductile Iron Edge Channels. These were supplied with four Qmax 225/350 outlet chambers and five Swale inlets. There were specially adapted connections from the back of the Kerbdrain sections at intervals into the swale, and outlets to feed planters used to green the public areas around the service facilities.

Gloucester Services northbound opened during the summer of 2014 with the southbound MSA having opened this summer. The two facilities have been developed at a cost of £40 million and create play, picnicking and dog exercise areas as well as offering 265 car parking spaces plus 35 HGV bays. The project has created hundreds of jobs for local people and will serve local produce. For more information on ACO Water Management www.aco.co.uk.

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Stormwater & SuDS

SuDS Manual updates gain approval from industry experts REVISIONS to the CIRIA SuDS Manual, the so-called UK ‘bible’ for Sustainable Drainage System design and delivery, have been welcomed by industry experts for heralding a more pragmatic approach that could help to get more SuDS schemes delivered in future. The update is a significant step forward, particularly in the way it has realigned the use of proprietary treatment devices as a fullylegitimate member of the SuDS component toolbox. In the 2007 edition, manufactured treatment devices that remove pollutants through processes such as hydrodynamic vortex separation were classed only for use in ‘pre-treatment’; this distinction led to restrictions in the way they could be applied in schemes across the country.

“Precision-engineered solutions are not the enemies of Green Infrastructure, they can enable it. The more balanced, pragmatic approach represented in C753 recognises the valuable contribution that manufactured devices make, helping to bring about a ‘can do’ approach to getting SuDS schemes built.

“In particular manufactured devices can help to define and implement more predictable maintenance and service approaches for SuDS that can facilitate adoption and ownership; issues that have been a barrier to progress. “Just as important is the need to change perceptions that land-take and construction cost limitations stand in the way of delivering effective schemes. By creating precision-engineered solutions using a range of components, developers can achieve the best of both worlds, retaining valuable space for building and still engineering drainage pathways that work as nature intended. It can be done. “A management train of appropriately engineered components such as Hydro International’s Downstream Defender® advanced hydrodynamic vortex separator, can mimic natural pollutant removal processes - as the key principles of SuDS dictate. The solution could even improve on nature, especially where the ground conditions are unfavourable to infiltration or natural treatment solutions”

Mark Goodger, Stormwater Regional Technical Manager for Hydro International and member of the project steering group

Speak to us about our

CWF Storm Flush self regulated storm tank flushing technology A storm tank cleansing system which provides a cost effective solution for the removal of sedimentation by the use of automatic, self regulated flushing technology. Before flushing • Cleans ecologically, without external power, without external water supply and without controls • Flushes even after partial fillings • Fully self priming and flushing operation • Suitable for new tank and existing tank retrofit • Suitable for both open and below ground installations • No moving parts. Intrinsically safe. Any shape tank • Utilises storm water for the flushing process • Retains total volume of storm tank • Final flush polishing stage utilises settled storm water • Synchronised flushing of multi unit installations within larger tanks

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After flushing

Stormwater & SuDS

Technology in action

Hydro International hosts the Engineering Nature’s Way website which shares many examples of innovative, sustainable surface water management projects and technologies. Visit www.engineeringnaturesway.co.uk or click on the links to relevant projects below. The Hydro-Brake® vortex flow control was invented and developed by Hydro International more than 30 years ago and has become an industry-standard method of flow attenuation. Increasingly, it is being used as a lowerimpact technology for upstream attenuation flood defences, with the largest schemes controlling flows in excess of 33 m3/s and holding back millions of cubic metres of water.

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Hydro-Brake® flow controls have been installed installed in a flood alleviation scheme at Northallerton, North Yorkshire. They enable excess water to be held back in specially built flood storage basins in agricultural land on the outskirts of the town, protecting 170 properties.

Super-Sized Flood Protection

Super-sized Hydro-Brake® Flood Alleviation flow controls are protecting thousands of homes and businesses in pioneering and award-winning projects.

Hydro-Brake® vortex flow control technology is an environmentally-sustainable technology used extensively to prevent surface water and watercourse flooding. It is well proven and completely scalable from small schemes protecting a few properties to giant fluvial dams that protect major urban conurbations.

Hydro-Brake® Flood Alleviation installations form part of Scotland’s award-winning and largest flood alleviation scheme, the White Cart Water Flood Prevention Scheme where 1,750 urban and suburban properties are protected, including commercial and residential. The flow controls hold back water behind three dams creating temporary storage areas on agricultural land in the highlands above Glasgow. The water is released downstream at a controlled rate so that it does not overspill flood defences protecting properties downstream.

A scheme in the valley of the River Douglas in Wigan protects 610 properties from flooding in the nearby city centre. Smaller communities from 70 to 300 homes have also benefited, for example at Portpatrick, Argyllshire, once devastated by flash floods through its streets, Weedon Bec in Northants and Devil’s Bridge near Sheffield.

Nature’s perfect curve

Hydro-Brake Optimum® There is no equivalent Inspired by Nature and engineered with a perfect curve. There is no equivalent to Hydro-Brake Optimum® when it comes to achieving the best possible hydraulic performance. Call: 01275 337937 Try the Design Tool at: www.hydrobrakeoptimum.com

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River & Wetland Management

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River & Wetland Management

De-silting programme minimises environmental impact Wardown Park was created in the early 1900’s as a recreational area for Luton’s expanding population and is still enjoyed as a green refuge within walking distance of the town centre.

Its outstanding feature is an extensive oxbow boating lake some 480m long created by channelling the River Lea within retaining walls and a concrete bed around 1m below the water surface. Previous de-silting has required damming, the removal of fish and waterfowl and complete drainage to allow access to tracked excavators.

“Besides watercourses, the Conver is perfect for cleaning silt from Lakes, Lagoons, Ponds and wide stretches of open water” explains Michael Reeve, General Operations Director of ADC. “There is no need to drain the lake or remove the fish stocks as they survive quite happily around the

de-silting operation. We monitor oxygen levels continually as we work and suspend operations to allow water to re-oxygenate if required”. The silt is pushed to a suitable location by the silt pushers and is allowed to stand for a short time to

But technology moves on and ADC the drainage specialists have commenced de-silting the lake with a much more environment friendly approach.

They have deployed their two Conver silt-pushers: the C86S with 8.2m wide silt blades and the compact C86XS, a 4.7m wide machine for less accessible locations. www.fadsdirectory.com

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allow any fish in the area to leave, before it is removed from the river by clam shell bucket into a fluid separation unit – first stage where any debris is removed before pumping to ADC’s de-watering containers – second stage.

A water soluble polymer is added to facilitate efficient separation of silt from water in the de-watering containers. This results in clear water which is returned to the lake and the silt is then taken to Biogenie*.

fish, birds and public have hardly noticed!

*ADC’s de-watering facilities can also treat soils which have been classified as WAC failing hazardous waste. These wastes are treated rather than disposed to landfill and the resulting

River & Wetland Management

soil is re-used beneficially for restoration and landscaping. The service is exempt from landfill tax, delivering significant cost savings as well as a sustainable alternative to clients over disposal to landfill.

Each de-watering containers can be filled in with up to 40m³ an hour, with up to 16 tons of silt remaining after de-watering. The lake has been divided into 5 zones for de-silting. The first was completed in 2014 as a trial when 1000 tons of silt was removed. ADC use their own hook loader lorries to convey the skips to the waste facility.

Luton Borough Council has expressed their total satisfaction with the operation and, as importantly, the

adcdrainage.co.uk

See us at the Flood Defence & Prevention Expo

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

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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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River & Wetland Management

Following a 150 year absence, Atlantic Salmon finally return to the River Don

“2015 has been a fantastic year for South Yorkshire’s rivers with salmon leaping in Rotherham and confirmation of spawning salmon in the River Dearne. Barbel have also begun breeding in the river following an extensive restocking programme we carried out between 2007 and 2011.”

Jerome Masters, Environment Agency fisheries officer

“It’s fantastic to see salmon at Aldwarke, so soon after our new fish passage was opened. Whilst generating renewable electricity is our number one priority, we also wanted to see salmon safely navigate upstream towards Sheffield. It’s wonderful that they are now doing so, and we hope that we will see a lot more fish up and down the River Don.”

The new fish pass at Thrybergh weir

Atlantic salmon are returning to the River Don following an absence of around 150 years, with the leaping fish now being seen at Aldwarke weir on the eastern edge of urban Rotherham.

Extraordinary footage capturing the fish’s efforts to jump the weir was taken by 18 year old Oscar Downing, whose father, Anthony, is an environment officer at the Environment Agency. Having heard that there had been sightings of salmon in the river, Oscar thought he would try his luck at getting one on film. Only 20 minutes after setting up his camera the iconic fish made its appearance.

Mark Simon, Chief Executive Barn Energy

Salmon were once so common on the River Don that they provided an affordable meal and formed a staple part of the local diet.

But in the 18th Century a number of weirs were built along the river for industry or to regulate water levels for boats. These prevented salmon, lamprey and eels from migrating, and any coarse fish like barbel that are washed over a weir during high waters cannot return back upstream. There are over 200 weirs in the River Don catchment with 19 between Sprotbrough and the centre of Sheffield. Pollution from industry during the 19th and 20th Centuries then made the river uninhabitable for most wildlife.

The presence of salmon at Aldwarke has been made possible by the new hydropower scheme, built and run by Barn Energy, four kilometres downstream at Thrybergh weir. www.fadsdirectory.com

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River & Wetland Management

Opened in October 2015, the scheme includes a specially designed passage to enable salmon, other fish and eels to swim upstream. Due to dramatic improvements in water quality over the last 20 years our rivers are the healthiest they have been in modern times, and we are working hard to maintain what we have achieved so far and to further improve water quality and biodiversity. This includes building a series of fish passes through the weirs that have blocked the passage for fish. Migratory fish such as salmon and sea trout are now able to swim freely as far upstream as Rotherham. Another recent example is completed ÂŁ500,000 fish and eel pass at Sprotbrough Weir, near Doncaster, (above) allowing fish to migrate upstream as far as Rotherham, and also into the River Dearne.

The Sprotbrough fish pass is part of a wider programme of work which will improve the river for coarse fish and eel and also return salmon to the centre of Sheffield. There are 14 further weirs between Sprotbrough and Sheffield, and five of these are already passable to fish.

Sprotborough fish pass, completed in 2014 The Sprotbrough project was funded by the Environment Agency, supported by income from rod licence fees, plus a significant contribution from Lafarge Tarmac through the Landfill Community Fund. The fish pass will be maintained by the Canal & River Trust, which owns the weir and has supported the delivery of the project, along with the Don Catchment Rivers Trust and the Don Gorge Community Group.

Hadfield Weir fish pass www.fadsdirectory.com

The Hadfield fish pass (below) was completed in 2013, at a cost of ÂŁ300,000, on the River Don at Meadowhall.

The Environment Agency and organisations including the Canal and River Trust, Don Catchment Rivers Trust, Sheffield City Council and Yorkshire Water are currently working on further fish passage and habitat improvement projects that will enable these iconic fish to return to their historic spawning grounds within and upstream of Sheffield.

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River & Wetland Management

Automatic weedscreen cleaner ticks all the boxes CW Group of King’s Lynn held an open day for IDBs and other specifiers to meet newly appointed management and inspect the latest CW 5000 Automatic Weedscreen Cleaner which has undergone major upgrades to meet current and future industry needs and environmental advancements.

Guests were able to meet and discuss their specific needs with newly appointed specialists Andy Spooner (Operations Director) and Paul Millard (Engineering Director), who bring additional expertise regarding electrical and engineering to move the CW Group forward for the benefit of their customers. In addition to providing technical information, the event gave clients and suppliers the opportunity to share experience and knowledge in an ever challenging and changing environment.

The CW weedscreen cleaner has consistently evolved to meet customers’ needs. ‘It is important that the industry is aware of upgrades we have made to ensure the reliability of the machine, the technical advances from our supplier chain and our customer care support system’ said Tony Jolley, Managing Director. The CW 5000 Automatic Weedscreen Cleaner demonstrated at the event is part of a project for Drax Power Station on the River Ouse between Selby and Goole, the only coal fired station in the UK to have been

converted to wood chip biomass fuel. JBA Consultancy has specified the project on behalf of the local IDB. Advances in electronic components and software programming have enabled us to develop our popular weedscreen cleaner... The key developments include

• Electronic shear pin in the main panel to prevent overloading while an electrical junction box (IP66) has been amounted onto one of the unit’s legs to bring the machine up to current legislation position the junction box above potential flood level. • We have added a 9 core catenery cable to the main

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 & Wetland Management

beam wiring loom to accommodate new requirements for control sensors and future advances.

• A broken Tecreel spring electrical fault switch has been added to prevent damage occurring in fully automatic mode. A Tecreel cycle counter added to Magelis control panel will facilitate simple replacement of Tecreel spring at end of cycle life.

• Electrical fault switch will detect a broken rope or slack rope.

• Automatic surface clean electrical switch now enables the machine to shadow the water level as it rises and falls, ensuring the removal of heavy surface weed in both flood and seasonal variations. The new Pulsar Ultrasonic differential level probes are fully submersible.

Up-rated red fault beacon allows the beacon to operate independent of the sounder. The sounder is now controlled from the Magelis unit and can be turned on and off from there.

• New trolley motor thermal snap switch detects overloading of the trolley motor.

• Fault history retrieval system added to the Magelis controller permits more accurate diagnostics when fault finding. Single or twin

• Low oil level switch now allows us to utilise a small hydraulic reservoir and prevent environmental oil spills as the machine shuts down.

•All switches now sensor tagged to aid fault finding and identification on the drawings.

maintenance platforms are now available.

Operation & Maintenance manuals have been up dated to accommodate all changes and break down and yearly inspection service improved. We now offer an inspection service and written report for CW machines. This service is now also available for other makes of weedscreen cleaners and automatic trash rakes. Please contact CW Group for details and prices.

Specialists in bridge replacement, bank protection and fencing.

Talk to Lattenbury Services about your next waterside project: bridges, board walks, fishing platforms etc. Besides a full design service we have access to machinerryy and equipment suited to the job in hand. See our website for projects and testimonials. Godmanchester . Huntingdon . Cambs . PE28 9PA . Tel: 01480 830 224 . lattenburysevices.co.uk www.fadsdirectory.com

River & Wetland Management

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Sustainable meets practical Natural looking solutions that don’t compromise principals or appearance Practical preservation of natural beauty

Liniar is a very well-known brand in the caravan market for its extensive range of decking and fencing used throughout the UK. What’s not such common knowledge is that they also manufacture a range of plastic piling retaining systems - and these proved invaluable for one caravan park…

When the environmentally-conscious owners of a prestigious caravan park were confronted with various maintenance projects they were faced with a dilemma - finding practical solutions while preserving the natural beauty of the surroundings.

Claylands Park in Cabus, Lancashire, was established in 1959 as a small 14 acre farm set on the banks of the River Wyre and overlooking The Trough of Bowland, an area of outstanding natural beauty.

It proved to be the perfect canvas for the owners to create a landscape masterpiece over the next 55 years. Planting over 5,000 indigenous trees in that time, Claylands Park has become a natural haven for squirrels, foxes, deer, rabbits and 85 different species of bird life.

So, when one of their four fishing ponds started to leak in 2012, it was vital to the owners that they could fix the problem without compromising the principals and appearance of the park.

Liniar’s log piling has also been used on the site including a bank retention project. 38

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Andrew Brewer, a partner of Claylands Park, explains:

“Whilst browsing through a Liniar brochure that we had been given, the plastic piling caught my eye as we needed a product that was going to be manageable and easy to use, but also maintenance free and that wouldn’t rot or rust in the water and this seemed a perfect solution. “The fact that it’s made from 100% recycled materials and manufactured in the UK only added to the appeal. “The pond bank was being eroded and causing it to leak. The plastic piling proved perfect for us to be able to retain and reinforce the banking, stop the erosion and to tidy it up. We were delighted with the end result.”

River & Wetland Management

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Putting the fun into bank stabilisation

As a company, Liniar has a strong belief in being environmentally friendly - so when asked to take part in a sustainability project in South Yorkshire the team was delighted to offer assistance. The Carillion Rail-organised Sustainability Week concluded with a day of events at the beautiful Manvers Lake in Rotherham, with a team of managers working alongside students from Sheffield Hallam University and Dearne Valley College in a variety of team building activities. As well as various fun events, such as canoeing, kayaking, dragon boat race training and some rather dodgy raft building, the voluntary work also included clearing out an overgrown culvert, filling in pathways to eliminate tripping hazards, clearing vegetation to extend the slalom pond, and preventing embankment erosion. And this is where Liniar came in. Liniar sales director Mark Sims swapped his suit for scruffs for the day and arrived with a van full of plastic piling, two piling caps and a huge rubber mallet, fully prepared to get stuck in and to help the volunteers to protect one of the eroding banks around the lake.

Because Manvers Lake is so big, waves have started to erode the section of bank in question and vital work was needed to prevent this from getting any worse.

Liniar’s plastic log piling was spotted by the event organiser, Carillion Engineering Manager Becki Finch, at the recent RailTex exhibition at the NEC, and she immediately identified it as the ideal product for the job.

Because of its lightweight properties and ease of installation, log piling is perfect for any kind of retention task. The fact that it’s manufactured in the UK from 100% recycled material, doesn’t rot, rust or leach chemicals into the ground, meant that it would be ideal for an event of this kind. It’s also covered externally with a timber composite finish to give it a natural look and enable algae or moss to grow on it – so that it blends in beautifully with the natural habitat.

Mark Benton, chairman of Manvers Lake Trust, stated that: “The team has achieved more in one day than we would have been able to achieve ourselves in nine months.” Protect and repair Event organiser Becki Finch thanked Liniar for its involvement: “We’re very grateful to Mark and his team for assisting with this worthwhile project. The plastic piling they’ve donated and helped to install has gone a long way to repairing and protecting the banks of this gorgeous lake. “The fact that the Liniar piling is made from 100% recycled PVCu and is friendly to the environment means that it was the only choice for a sustainability event such as this. “Not only that, but the log pile blends in superbly with the natural surroundings. We couldn’t be happier with the finished job.” For more information on Liniar’s range of plastic piling go to: www.liniar.co.uk/our-products/plastic-piling, email: sales@liniar.co.uk or call: 01332 883900

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