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The on-line magazine for the water management industry

Spring

2016

Alleviate lowland flooding with upland restoration

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Contents Flood Risk

Extra Funding for flood Defence

5

Yorkshire Floods 100 days on

6

DEFRA appoints new EA Acting Deputy Chair

LGA puts Winter flood costs to councils at close to £250m

8

The aims of National Flood Resilience Review

LGA puts Winter flood costs to councils at close to £250m Reduce flood risk by restoring healthy ecosystems Flood Re NOW LIVE

FloodSax answers prayers as flash floods hit South African church The Flood Company declares WAR on backflow

Are the current UK Standards for flood barriers high enough? Model and map catchment processes

Trees and river restoration alleviates flooding

Reduce flood risk by restoring healthy ecosystems

10

The Belford natural flood defences

Revitalising natural landscapes to reduce flood risk New Scottish National Centre for Resilience Essential flood defence works in Somerset

Surface Water & SuDS

16

Long-Awaited Northallerton Flood Defences Use Sustainable Vortex Technology Controlling Flood Risk on Devon’s New Link Road Hydro International acquires Hydro-Logic

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18

20 - 21 23

24

27

28 - 29

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36 - 37 38

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40 - 41

Rivers to benefit from proposed legislation

43

Improving water quality and habitats in Peterborough

45

Fish-Friendly Scheme saves Stakeholders £3m

England’s rivers restocked with a record breaking number of fish

Directory

Contact information

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

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12 - 13

34 - 35

First weir removed by the Medway catchment partnership

Rivers to benefit from proposed legislation

10 - 11

Walthamstow Stadium development SuDS solution

River Restoration and Management

18

8-9

31 - 32

Is it crunch time for clay land drains?

Trees and river restoration can alleviate flooding

7

Schedule 3 – Gone but not quite forgotten yet SuDS: The State of the Nation Survey

Model and mapping catchment processes

6

Advertising advertising@managingwater.co.uk Tel: 0845 2 575 575

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46 - 47

48 - 49

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Editorial articles@managingwater.co.uk Tel: 0845 2 575 575

Subscriptions subscribe@managingwater.co.uk Tel: 0845 2 575 575

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Flood Risk


Flood Risk

Extra Funding for flood Defence

The Chancellor announced an extra £700m in flood defence funding

This comes on top of the £2.3bn of planned spending up to 2021 exceeding the Government’s manifesto commitment to build 1,500 flood defence schemes and representing a real terms increase in capital investment that is up from £1.7bn in the last Parliament and £1.5bn 2005-2010.

In total £150m of capital spending will build flood defence schemes in areas affected by the December floods which will bring protection to more than 7,400 properties. This will include: £115m extra for Yorkshire with schemes in Leeds, York and the Calder Valley – to better protect 3,000 homes and 1,700 businesses and other properties. And the

Leeds

A new £65m scheme will start for Leeds covering the area north of the station and the wider Aire catchment to better protect 579 properties. Government will provide £35m between now and 2021, and will provide funding to complete the scheme. To ensure we give a better standard of protection to a city with the economic importance of Leeds a scoping study to progress the plan will be published by the end of the March. It will look at traditional flood defences, upstream flood storage areas, planting trees in the upper catchment, run-off reduction through better management of agricultural land, slowing the flow from the source of the river in the Yorkshire Dales.

These new plans enhance work already underway in the area to the south of the station in Leeds which

government will fund the completion of the Leeds scheme beyond 2021. £33m extra in Cumbria for schemes in Kendal, Appleby, Flimby, Eamont Bridge, Wigton, Pooley Bridge, Rickerby Park and Braithwaite – to better protect 1,700 properties and key local infrastructure.

The government has also committed investing up to £25m in flood defences in Carlisle once the Environment Agency has concluded a review of its needs in the city. This brings the total capital commitment by 2021 in Yorkshire to £400m, with at least £43m being spent in Cumbria.

The focus for schemes funded by the additional capital spending will be those that help communities at highest risk and secure economic growth, particularly in areas that were affected in December. The £700m extra support also includes: a £160m boost for the maintenance budget, taking it to more than £1bn in this parliament. This will help protect an extra 20,000 houses by keeping existing defences operational; and money to fund recommendations from the on-going National Flood Resilience Review.

will protect 3,000 homes and 500 businesses. The government is already committing £33m to this scheme which is due for completion in March 2017.

Calder Valley

An additional £35m will also be invested in the Calder Valley to better protect 1,600 properties. This will include schemes in Hebden Bridge and Mytholmroyd. A feasibility study for the Calder Valley is already underway with an action plan for Mytholmroyd due to be published in May and a plan for the whole Valley by this autumn. This is in addition to the £17m of work already planned by 2021 in the Calder Valley.

York

The government will make available £45m additional funding for work in York which will see around 15

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Thanks to this additional funding communities across the north will be better protected from the devastating effects of the sort of extreme weather we saw in December.

We are committed to securing the economic future of the Northern Powerhouse. By delivering improved flood defences and looking at what more we can do to slow the flow of flood waters across whole catchments we doing more than ever before to protect Yorkshire and Cumbria and keep them thriving and open for business.

Elizabeth Truss, Environment Secretary

In December, I saw for myself how the record breaking levels of rainfall caused so much damage across the north of the England. Since these floods, there has been the most moving and impressive response to the floods, right from communities to volunteers, the emergency services and local authorities. I’m extremely pleased that we have provided a further £700 million to help better defend these communities in the future.

Rory Stewart Floods Minister

schemes at different locations throughout York to upgrade raised defences and provide a consistent standard of protection for the City. This will better protect over 2,000 properties. This is in addition to the £10m that has already been committed for repairs and upgrades to the Foss Barrier where work is planned to start in early April and be complete by December 2017. This builds on work already planned this Parliament in York including schemes at Water End and Clifton Ings and Rawcliffe Meadows which will protect over 1400 homes

Cumbria

Cumbria will receive an additional £33m for schemes in Kendal, Appleby, Flimby, Eamont Bridge, Wigton, Pooley Bridge, Rickerby Park and Braithwaite – to better protect 1,700 properties and key local infrastructure.

5


DEFRA appoints new EA Acting Deputy Chair

The Secretary of State for the Department for Environment, Food and Rural Affairs has reappointed Richard Macdonald to the Environment Agency Board for a second term from 31 May for a further four years. He will also take up the post of Acting Deputy Chairman.

Flood Risk

Yorkshire Floods 100 days on

8,500 inspections, 900 flood defences in need of repair and Flood Action Plans in progress

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. All non-Executive 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 Environment Agency has major responsibilities in flood management, water resources and quality, climate change, land quality, chemicals, pollution prevention and control, waste, conservation and biodiversity, fisheries conservation, air quality and navigation.

There is a requirement for appointees’ political activity (if significant) to be declared. Richard Macdonald has confirmed that he has not undertaken any significant political activity during the past 5 years.

Biography Appointed Board member June 2013-2020 5 days per month Richard is a member of the Audit and Risk Assurance, Remuneration, and the FCRM Committees. He is the lead Board member for Land Agriculture and is also Area Board member for Shropshire, Herefordshire, Worcestershire and Gloucestershire, and Staffordshire, Warwickshire and West Midlands.

Richard was the Chair of the Better Regulation Task Force taking on responsibility for its implementation. He has a strong farming background and was the Director General of the National Farmers’ Union from 1996 - 2009. He is the Chairman of Farm Africa, a Trustee of the Earth Trust and Chairman of the Food Standard Agency’s Action on Campylobacter Board.

Richard is also currently a Non-Executive Director at Dairy Crest and Moy Park and is also the Vice Chairman of the National Institute for Agricultural Botany (NIAB). 6

The damaged flood defences in St Michaels Photo: Lancashire Fire and Rescue

The Environment Agency has carried out 8,500 inspections and identified around 900 flood defences needing repair work in the wake of record-breaking wet weather in December. More than 100 have already been completed and a further 300 are well underway.

December was the wettest month on record, with 14 rivers across the north recording their highest ever flows. Almost 200 Environment Agency river level gauges recorded their highest ever river level, 10 per cent of the total across England. Honister Pass in Cumbria saw the highest amount of rainfall ever in a 24-hour period, as more than 341mm fell. The ongoing recovery work includes:

• High priority damaged flood assets, such as the banks at Croston and St Michaels in Lancashire, have already been repaired either permanently or on a temporary basis. • Around 300 Environment Agency staff and contractors are working on recovery. • Flood Support Officers have visited more than 150 communities.

Work has already started on an action plan for flood defences in Mytholmroyd (to be completed by May 2016), and an outline business case is being developed for Hebden Bridge looking at a range of options to reduce the risk of flooding in the town. This is expected to be completed by early 2017 with construction starting in summer 2017. The EA is also currently working with other risk management authorities with a view to delivering a catchment plan to reduce flood risk for the whole Calder Valley.

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Flood Risk

The aims of National Flood Resilience Review

The government has set out the terms of reference for the National Flood Resilience Review, which will be chaired by the Chancellor of the Duchy of Lancaster, Oliver Letwin. Established following Storm Desmond, the Review will assess how the country can be better protected from future flooding and increasingly extreme weather events. It will focus on four key areas:

• updating climate modelling and stress-testing the nation’s resilience to flood risk

• assessing the resilience of our important infrastructure like electricity substations

Chancellor of the Duchy of Lancaster, Oliver Letwin.

“This Government is strengthening our country’s flood defences, including spending £2.3bn over the next six years. This new review will make sure communities are as protected as they can be from the kind of extreme weather we saw last December.”

• temporary defences

• future investment strategy The Review is set to be published this summer and the team will include the Government’s Chief Scientist, Defra, DECC, DCLG, HM Treasury and the Chief Executive of the Environment Agency. During the autumn, the government will begin implementing any short-term measures identified, and will begin work to review the longer term strategy, which will include close consultation with the National Infrastructure Commission. The full terms of reference for the National Flood Resilience Review Group (NFRRG) are below:

Elizabeth Truss Environment Secretary “We need to be sure we have the best possible plans in place for flood prevention and protection across the whole country. This Review will identify any gaps in our approach and pinpoint where our defences and modelling need strengthening, allowing us to take prompt action.”

The first task is to carry out a new assessment of the damage that extreme rainfall could cause across England. This will allow us to take a hard look at how our cities, towns and villages stand up to severe flooding. It will assess the impacts on crucial elements of local infrastructure, including significant roads, bridges, energy infrastructure, water treatment plants, telecoms and hospitals. This will provide a ‘stress test’ of our nation’s resilience to flooding, so improving our understanding of the possible implications of extreme events. In doing this we will also review whether the assumptions in current modelling are still sound. We will shortly be issuing a call for evidence to inform this work.

With this evidence and analysis in hand, government will then turn to considering the longer term strategy on flood risk alleviation. This will look at temporary and flexible responses as well as hard flood defences beyond the current six-year programme. This will include the balance between protection and resilience, an assessment of risk in England’s core cities and will consider the role of both government and wider society in reducing flood risk. The Review will align closely with Defra’s work on integrated catchment-level management of the water cycle in the government’s 25 year Environment Plan.

Government will engage widely through the process and will provide an update in the spring.

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Flood Risk

Winter Flood Survey puts flood damage at close to £250m

A snapshot analysis by the Local Government Association (LGA), which represents more than 370 councils in England and Wales, estimates local authorities have so far been landed with this huge bill after the devastation wreaked by storms Desmond and Eva. The LGA warns the final bill to councils could be much higher as local authorities are still assessing the full cost.

groups to help areas recover from the devastating and unprecedented flooding, keeping residents up to date with regular postings on their websites and through social media and special flood-watch apps. Councils have also visited flood-hit areas to collect household items such as carpets and furniture to dispose of them. So far, an average 1.66 tonnes of household goods and

Worst hit have been Cumbria, which sustained about £175 million in damage, Calderdale with £33 million, Northumberland with £24 million and Lancashire £5 million. Government funding has been important in enabling local authorities and their communities to recover from the winter's flooding havoc. However, the LGA warns councils will need more financial help from the Government as the full cost of the damage emerges.

Nearly £250 million in damage was caused to key infrastructure like roads, bridges, public rights of way, and drainage systems by this winter's flooding, new research reveals.

New flood defence funding should also be devolved by government to local areas, with councils working with communities and businesses to ensure money is directed towards projects that best reflect local needs.

Staff have worked tirelessly with volunteers and local community 8

freezer waste has had to be removed from each of the 16,500 homes and businesses that have been flooded, the LGA estimates. Councils are calling for all landfill tax, which is calculated at just over £82 per tonne, to be returned to local taxpayers and invested back in to projects that will support local jobs and growth, rather than go to the Treasury.

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Flood Risk

The A591 in Cumbria

"The devastation wreaked by this winter's flooding has landed councils with a bill of nearly £250 million - just for damage to key infrastructure like roads and bridges. Councils are still literally counting the cost and the final bill is likely to be much higher. Government has gone a long way to helping hard-hit communities get back on their feet. But it is clear more financial support will be needed for councils. "Other measures from government could also make a massive difference in helping councils. These include allowing them to keep landfill tax and devolving new flood defence funding to local areas.

"Councils continue to give their all for floodhit areas. The sense of community spirit across the country and huge efforts of council staff who have worked long hours and with little rest has been inspirational.

"Even now, council staff are still preparing for the possibility of further severe storms to ensure the safety of residents, homes and businesses, shore up flood defences, and protect road networks and power supplies as much as possible.

"People should continue to keep an eye on council websites and social media feeds for updates on the situation in their local areas." Cllr Peter Box, Chair of the LGA's Environment, Economy, Housing and Transport Board

Cumbria

£175 million total for damage to council owned infrastructure and assets as a result of the floods. This includes: • survey work • bridges • landslips • carriageway damage • building of temporary road on the A591.

Over 50 per cent of the cost relates to damaged or destroyed bridges and damage to the carriageway.

Northumberland

£24 million includes an estimated £6.5 million on bridges, £8.8 million on landslips and £7.05 million on roads and drainage.

Calderdale

£32.5 million required for infrastructure. This figure includes a number of key roads and bridges which need significant work.

Lancashire The initial estimate of the repair cost stands at £5 million although this may increase once underwater structural examinations and cost estimates for road repairs have been completed.

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Flood Risk

Reduce flood risk by restoring healthy ecosystems

Seventeen-fold increase in flood losses over the next 65 years The increasing flood risk The European Environment Agency (EEA) report ‘Flood risks and environmental vulnerability — Exploring the synergies between floodplain restoration, water policies and thematic policies’, published in January 2016, highlights the benefits of an integrated approach to flood risk management.

The reported says that annual flood losses are expected to increase fivefold by 2050 and seventeen-fold by 2080. 10

Photo: © AndréKu ̈nzelmann/UFZ

The report is based on the analysis of 3,563 flood events over a 30 year period (1980 to 2010) and across 37 countries. The highest year recorded was 2010 when 27 countries reported a total of 321 flood events. (See table below)

The increase in annual losses has been attributed to the rising value of land within flood plains and climate change. Theincrease to 2050 will be attributable in the main to rising flood plain values (between 70% and 90%) with climate change accounting for between 10% and 30%.

Number of reported flood phenomena between 1980 and 2010

Note: Flood severity is an assessment of ood phenomena magnitude. It considers the reported values on frequency, reported total damage (in Euros and descriptive classes), number of ood events within one ood phenomena unit and severity classes as reported in the Dartmouth Flood Observatory database (ETC/ICM, 2015b). All phenomena with fatalities are in the 'very high' severity class.

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Flood Risk

Disappearing flood plains

The floodplain is the area next to a river bed which is more or less frequently covered with water in times of high water discharges from adjacent rivers. Wetland is one type of floodplain. By retaining water, floodplains can buffer the effects of heavy rainfall and in this way protect economic activities and communities further downstream from flood damage. However, many former natural floodplains are under increased pressure from urban sprawl, infrastructure developments and agriculture. In Europe, up to 90% of floodplains have been lost during the past centuries or are no longer able to serve as functioning natural ecosystems providing flood risk reduction and habitats favouring a high biodiversity. Based on reporting from nine countries, the report shows the share of population living in floodplain areas. Of those nine, Italy has the largest population living in floodprone areas (6.7 million people, 11% of the population) whereas Hungary has the highest relative share of people living in such areas (1.8 million, 18% of the population).

Flood risks and environmental vulnerability

In order to carry out an integrated approach to flood risk management there must be a coordinated implementation of EU legislation, such as the Water Framework Directive (WFD), the Birds and Habitats Directives and the Floods Directive through coherent measures and actions, would enhance the effectiveness of the policies.

Floodplain percentage per subcatchment.

restoration. By 'greening the grey' and making a network of green infrastructures, the necessary protection levels can be combined with a minimum loss of habitats and a good preservation of ecosystem services.

Future extreme floods are likely to be the cost drivers for the adaptation of infrastructure. Ecosystem-based adaptation, nature-based solutions and green infrastructure are, in many cases, key in ensuring a costeffective approach to an uncertain scenario by delaying or avoiding lock-ins to classic infrastructurebuilding water management. The report also notes that although strategies for flood risk management require measures that are specific to the local circumstances, using a river

The restoration of healthy ecosystems, for example through the Natura 2000 networks, is often a very effective way of preventing and mitigating floods. Even when 'hard' flood defences, such as dykes, are necessary to protect communities, those measures should be complemented with long-term naturebased solutions such as floodplain

basin approach avoids passing on negative consequences further downstream. Click the cover to read the full report

Photo: Š AndreĚ Ku Ěˆnzelmann/UFZ

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Flood Risk

Flood Re

NOW LIVE

Flood Re, launched today(4th April 2016), giving people living in flood risk areas better access to affordable flood insurance. It is expected to help an estimated 350,000 households in the UK at risk of flooding. The world-first scheme is now live and ready to accept policies from insurers. The launch follows months of preparation, from appointing a Board, testing IT systems and onboarding insurers to securing £2.1 billion in reinsurance cover.

The launch follows a number of recent milestones, notably receiving approval from the Prudential Regulatory Authority (PRA) and Financial Conduct Authority (FCA). The national scheme to help provide better access to affordable flood insurance cover is live. The list of insurers that are offering Flood Re compatible policies has been announced and further information on cover and pricing can be provided directly. The insurers are as follows:

Admiral Avantia (HomeProtect) Aviva Home Insurance Bank of Scotland Cherish Insurance Brokers Churchill Direct Line First Direct Home Insurance Halifax Hiscox Broker Legal & General HSBC Home Insurance Liverpool Victoria Lloyds Bank More Than Nationwide Privilege 12

The ABI have said that homeowners should not feel pressured to do anything in a hurry. Flood Re will develop over time and there may be greater choices available by the time existing insurance policies come up for renewal. They advise that property owners need to check if they live in a flood risk area, then speak to their current insurer to make sure that they understand what the current insurance policy covers and at what cost. Once established then shop around for the right insurance products with a focus on cover as well as price.

“Don't rely on insurance alone”

The ABI also advise property owners not to rely on just insurance but to also look at other ways to protect their homes. Flood protection steps should be taken to minimise or prevent flood damage. Whilst insurance might cover the cost in the event of a flood, taking steps to minimise the damage means that recovery times are quicker and residents can get back into their properties faster.

To create the evidence base Flood Re will listen to a wide range of stakeholders by establishing a transition plan advisory body with relevant experts. The next plan will report back on its work and will be www.fadsdirectory.com

published in time to inform the first of Flood Re’s five year reviews.

Brendan McCafferty, Chief Executive of Flood Re, said:

“I am delighted to announce that Flood Re is now live and ready to accept policies. We have been working tirelessly to ensure we’re ready so that consumers can start benefitting from greater choice and more competition in the insurance market. This should make flood cover more affordable and accessible to those in high flood risk areas over time.

“Consumers should check the Flood Re website to see which insurers are signed up, speak to their current insurer and be prepared to shop around. When buying a policy they should make sure it is the best one for them, not just the cheapest.”


Flood Risk

James Dalton, Director of General Insurance Policy at the ABI, said:

"It’s great to see so many insurers ready to make use of Flood Re from launch. Monday is just the start of a process and we know more providers will join them over time, bringing even more choice for people with homes at risk of flooding. "Insurance is an essential safeguard for your home and belongings. People in flood risk areas not being able to access affordable cover was a major concern, and why the insurance industry went to great lengths to design and create this world-first solution along with Government."

Setting out how the home insurance market will return to risk-reflective pricing by 2039 Flood Re is planned to be in place for 25 years. As well as helping to enable home insurance to remain affordable in areas at risk of flooding, Flood Re also has a role to help manage a transition to home insurance prices that fully reflect flood risk. This means that people benefiting from Flood Re need to become more aware of their flood risk and, if possible, take action to reduce it.

this free market, which may consider the premium charged for each policy and the levy charged by Flood Re to UK home insurers. The statutory plan sets out how the scheme will work with partners to enable lower prices and excesses to be offered to consumers. Flood Re’s role is to support these partners by providing a detailed evidence base highlighting: • How the data it collects on the cost of flood claims can be used by insurers and others to cut the cost of repairs. • Where it believes spending and incentives would be most effective in cutting the cost of flooding.

• How it may be possible in due course to incentivise householders and insurers to take the most effective measures to protect homes against flooding, whilst remaining firmly on the side of the people affected. These three combined elements will enable informed decisions to be taken on the most effective ways to reduce the cost of flooding and therefore insurance. The plan does not comprehensively describe how Flood Re will reduce the scheme’s subsidy as the evidence base required to plan for transition does not currently exist. To create the evidence base Flood Re will listen to a wide range of

stakeholders by establishing a transition plan advisory body with relevant experts. The next plan will report back on its work and will be published in time to inform the first of Flood Re’s five year reviews.

“Action must be taken to reduce the cost of flooding”

Brendan McCafferty, Chief Executive of Flood Re also added:

“If we are to successfully reduce premiums and excesses for flood prone homes in a sustainable way over the coming decades, action must be taken to reduce the cost of flooding. These properties will need to be made more resilient when flooding happens and action needs to be taken to bring down the cost of repairing flood damage. “Flood Re has an important role in ensuring any action is taken on solid evidence. However, as Flood Re has limited powers, we rely on developing strong relationships with the Government, government agencies, insurers, consumer groups and others to ensure that they take the necessary action to reduce the cost of flooding. To find out more about Flood Re visit the website here. www.floodre.co.uk

Flood Re have also launched a video explaining to householders how the new system operates.

After 25 years the Flood Re scheme will end and there will be a free market for flood risk insurance. There will be a review at least every 5 years to assess Flood Re’s progress in managing a transition to

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13


FloodSax answers prayers as flash floods hit South African church

Flood Risk

The Flood Company declares WAR on backflow, pests and rodents!

A church in Durban, South Africa, was badly flooded and worshippers feared their 100-year-old wooden floor had been damaged beyond repair and would have to be ripped up and replaced which would cost a fortune. But, after hearing that FloodSax soak up spills inside buildings as well as acting as effective barriers against floodwater outside, they turned to Environmental Defence Systems Ltd based in Huddersfield, Yorkshire for advice. EDS managing director Richard Bailey said: “I advised them to lay FloodSax across the flood as they would soak all the water up into them … and it worked. It meant the floor was saved.”

FloodSax resemble large pillowcases before they come into contact with water. A special polymer gel inside then soaks up the water which transforms them into ‘sandbags’. These have proved to be highly effective stopping floodwater outside homes and businesses from getting inside but they are now increasingly used to soak up water after internal floods. FloodSax have been used this way worldwide in hospitals and other public buildings as well as homes.

The church Richard helped is on Florida Road in Durban and is known as Church on Florida.

The leaders sent Richard a message that states: “We want to give a special thank you to Richard Bailey of Environmental Defence Systems in the UK who sponsored us with these incredible FloodSax that were able to absorb all the water from the flooding we experienced.

“We are so grateful for your generous heart. Our church is water free and will be safe from future water damage.”

The Flood Company, a Yorkshire based family business, has designed and manufactured a revolutionary new product. Their latest innovation, the WAR Non Return Valve, is the first of its kind.

The WAR valve is easy to fit and can be used on any 110mm/4” clay or plastic pipes. The key benefit of this revolutionary product is that due to its unique shape and design, it can open clear of sewer walls on both straight and bent inlets, making it the World’s first universal Non Return Valve. This innovative product, designed and manufactured in the UK, offers protection from flooding as well as rodents, insects and noxious fumes and will suit all properties, many of which have not been suitable for standard non return valves currently available. “Innovation and design is at the core of our business”

Says Luke Ruddiman, co-founder and Managing Director of The Flood Company,

“We have worked with many customers who could not benefit from a non return valve due to bends and curves in their drainage pipes and this left their properties vulnerable to backflow. I was determined to overcome this issue and worked on the design of the WAR valve over an extended period of time until I developed a design that was truly unique.” For further information about the WAR Non return valve, call our team on 0800 999 5355 or visit wwww.thefloodcompany.co.uk/war

For more on FloodSax please go to www.floodsax.co.uk 14

The Flood Company Commercial Ltd www.thefloodcompany.co.uk www.fadsdirectory.com


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Flood Risk

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17


How to model and map catchment processes when flood risk management planning Background

The Pitt Review after the flooding in summer 2007 concluded that flooding from a range of sources can no longer be managed by building ever higher, lengthier and heavier defences in urban and rural areas. The review emphasised the need to ‘work with natural processes’ as part of integrated portfolios of responses to flooding and coastal erosion. Working with natural processes means:

‘taking action to manage fluvial and coastal flood and coastal erosion risk by protecting, restoring and emulating the natural regulating function of catchments, rivers, floodplains and coasts’.

Why was the study needed?

While there are many different tools and levels of approximation that can be used to model the movement of water through a catchment, the models, data and tools available for this alternative form of flood and coastal erosion risk management have not been benchmarked. This means it can be hard to select tools that help to understand the potential benefits of adopting working with natural processes measures within a catchment.

What were the key products? The project developed:

 a catchment process flow chart to help understand how a catchment works and to identify potential data, tools and models to use when undertaking a working with natural processes scheme in a catchment

 an electronic library of tools which provides a detailed summary of a range of tools, data and models to help select the right tools for a catchment; its purpose is to provide practitioners with as much information as possible about different approaches, since availability of existing models and data and user-experience often dictates the software that can be used  a detailed summary of models, tools and data to help understand how different tools can be used to assist planning from flood source to flood scheme

 a series of 20 case studies which provide examples of how different models have been used to model a range of catchment processes across the UK

The purpose of this project was to review existing modelling software, mapping techniques and data to establish how they could be used to assess a wide range of catchment processes to help develop flood and coastal erosion risk management projects that work with natural processes to reduce flood risk. The review focused on models that have been used to assess:

 run-off generation  sediment processes  in-channel barriers  river floodplain barriers  diffuse pollution 18

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Flood Risk Click for for the review documents

How will these products be used?

A 3-step process has been developed to help select the right models, data and tools to use in a catchment study:

Step 1 involves using the Microsoft® Excel based model library to help select suitable models, data and tools which are the most relevant to a study. This library was compiled through a literature review, an expert workshop and the experience of the project team.

Step 2 allows practitioners to find out more about the models, data and tools selected from the model library. The detailed review of these provided in the report introduces a range of data, data analysis tools and models which can be used to assess a range of catchment processes. For each process, details are given of the key functionality of a range of tools. Step 3 involves using the 20 detailed case study examples to explore whether the models, data and tools a practitioner has selected are appropriate for use in their


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Register your interest to attend FLOODEX at www.floodex.co.uk Contact: Jon Irwin +44 (0)203 290 4066 jon@floodex.co.uk 8


Flood Risk

Further evidence that trees and river restoration can alleviate flooding A study, led by the Universities of Birmingham and Southampton, has shown that strategic planting of trees on floodplains could reduce the height of flooding in towns downstream by up to 20 per cent, according to research published in the journal Earth Surface Processes and Landforms.

Researchers studied a whole river catchment in the New Forest over an area of 100 square kilometres, upstream of the town of Brockenhurst. They wanted to understand how tree planting, river restoration and logjams might affect the ‘peak height’ of a flood in a downstream urban location.

The research was funded by the Environment Agency which is interested in the potential for river restoration techniques to be incorporated into wider flood risk management programmes. Using a digital terrain model of the landscape and a hydrological model simulation the scientists found that planting trees on the floodplain and increasing the number of logjams across 10-15 per cent of the total river length could reduce the peak height of a potential flood in the town by 6 per cent once the trees had grown for 25 years.

“strategic planting of trees on floodplains could reduce the height of flooding in towns downstream by up to 20%” “reintroducing flood forests to upland areas can be highly effective - and potentially much cheaper than conventional flood defences”

They also found that for more extensive floodplain forest and river restoration, for example in 20 – 25 per cent of the total river length, resulted in a reduction in flood peak height of up to 20 per cent. As the trees age and the forests become 20

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more mature and complex up to 100 years post planting there are larger reductions in flood peak height.

Dr Simon Dixon, from the University of Birmingham’s Institute of Forest Research (BIFoR), lead author of the study, said:

‘As our research shows, targeted tree planting and restoration can contribute to reducing flood risk. We believe that tree planting can make a big contribution to reducing flood risk, and should be part of a wider flood risk management approach, including conventional flood defences. Tree planting would represent an extra element that helps to slow down the arrival of rain water to vulnerable locations.’ The research team also studied engineered log jams – man-made dams which have numerous ecological benefits and have been


Flood Risk

shown to locally slow the flow of rivers. Recently it has been thought that log jams were a positive intervention and could form part of a general strategy for alleviating flooding. However the scientists found that although logjams slow the flow locally, this did not always translate to reduced flood risk at the catchment scale. Although logjams reduce downstream flood risk in some locations, in others they had no effect, or even increased flood risk – the researchers recommend detailed site studies to identify the best locations to install them for flood mitigation. An Environment Agency team joins Birmingham City Council, Birmingham Trees for Life and schoolchildren to plant 280 trees as part of the Perry Barr and Witton flood risk management scheme. Part of the River Tame flood risk management strategy

Capture rain where it falls and slow the flow Dr Simon Dixon continued:

‘Logjams contribute to slowing the flow by backing up water and pushing it onto the floodplain. In locations where the floodplains are meadows or crops the water may still be able to flow over the surface quickly. To make the best contribution to flood mitigation it is important they are used in locations with complex bankside vegetation to slow water flowing over the floodplain.’

Professor David Sear from the University of Southampton, who supervised the project, said:

‘With increasing interest in alternatives to conventional hard flood defences, there is an urgent need for evidence that these alternatives can work. This research reminds us that natural processes, when targeted carefully, can reduce downstream flood risk alongside other societal benefits including biodiversity and recreation.’

In 2014, Lord Roker, former environment minister reported that Britain should turn swathes of its upland pastures into woodland to help prevent flooding. Too much emphasis had been attached to the look of the countryside rather than practical considerations like trapping water. Farmers were paid to grub up the trees and hedges and plant the hills with pretty grass and sheep which can actually make flooding worse by compacting the earth.

to the main trunk river from all its tributaries.

An earlier study, also carried out by Dr Simon Dixon, suggested that reintroducing flood forests to upland areas can be highly effective - and potentially much cheaper than conventional flood defences.

Projects working with nature to reduce flood risk are needed right across the country and the government could theoretically encourage farmers to rewild key parts of their catchments using grants under the Common Agricultural Policy. However this would likely mean a reduction in the amount of grant available as a direct payments for farming - in effect, for owning land which is preferable to the famers.

He said new forests would slow flooding by trapping water with their roots.

Complex forested floodplains would dramatically slow water moving over them as they have an irregular surface covered by tree roots, upright tree trunks and dead wood.

He explained the process this way: "As a simple analogy during a flood many 'packets' of water are delivered

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"If the delivery of a single large 'packet' of water can be significantly delayed it will then arrive at the main river after the peak of the flood, and thus the main flood peak height has less 'packets' of water in it and is lower."

The best results come, he says, when rivers are partly dammed and a forest is allowed to grow on the floodplain. "This shows substantial and predictable responses in downstream flood height,"

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Flood Risk

The Belford natural flood defences “Flooding has stopped completely in Belford”

With heavy rains, the "bunds" slow the flow of water, allowing it to soak into the ground.

The village of Belford in Northumberland had a long history of flooding from the Belford Burn, disrupting its life on at least five occasions in the four years before 2007. The catchment to Belford is 10km2 and ranges from upland pasture to lowland arable farmland.

As funding for a traditional flood defence scheme could not be justified, the Northumbria Regional Flood Defence Committee allocated funding to implement a catchment management scheme to construct dozens of flow intervention structures in the catchment upstream of the town. This was the Belford Catchment Solutions Project – a partnership project between the Environment Agency, Newcastle University and Local Landowners. The cost of traditional flood defences came in at around £2.5 million whilst the actual cost of the project, using natural techniques, approximately £200,000 26 interventions that trap sediment, improve water quality, create new ecological zones and slow the flow of water were trialled and built which successfully held water upstream from Belford during the next flood.

Very simple and cheap "bund" structure strategically installed at margins of farmland.

The principle was INTERCEPT, STORE, SLOW, FILTER

The bunds or interventions created online ponds (on the course of the river), offline ponds (adjacent to the river). These ponds work by storing water when the river is high and releasing it slowly back to the river after the peak has passed. Bunds were also built across the overland flow routes. These intercept fast flow pathways of flood water, preventing run-off from reaching a water course too quickly. Large woody debris and other features were also installed which slow the flood peak and divert it onto the floodplain. The outcomes of applying this strategy of collaborative water management were:

Other simple measures, slowing the flow of water courses.

• Reduced flood risk downstream • Reduced levels of pollution • Habitat creation • Increased biodiversity • Increased farm productivity

Catchment management by building interventions at strategic places in the landscape to retain water upstream has been implemented successfully in other places too eg. in Pickering/Yorkshire. It is an effective, small-scale, sustainable and community –level approach for many other flood risk areas, including the Somerset levels. This approach could help reduce flood risk in the riparian areas of the UK at a fraction of the cost, time and effort.

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23


Flood Risk

Revitalising natural landscapes to reduce flood risk Sir James Bevan visited the uplands in the Peak District National Park on Friday to see firsthand how the Environment Agency’s investment is supporting the Moors for the Future Partnership in reversing the effects of hundreds of years of industrial pollution and helping to reduce flood risk. The partnership is leading a series of visits for Environment Agency staff to moorlands in Derbyshire, near to Sheffield, where conservation work has transformed the peat landscape that had been damaged by more than 150 years of pollution from coalfired factories on either side of the Pennines, and devastating wildfires. The work also ‘slows the flow’ of water running down from moorland into the River Derwent, which in turn reduces the flood risk and improves water quality for communities in Derbyshire and the Trent Valley.

In the past 12 years the partnership has brought over 5 square kilometres of bare and eroding peat moorland back to life, covering the ground with a protective layer of heather cuttings and temporary grasses while native species are re-introduced. This has prevented thousands of tonnes of carbon from being washed away into water courses and reservoirs where it has to be removed before the water is used for domestic supply.

Healthy peat bogs are naturally wet but bare peat is vulnerable to drying out. In the past 12 years the partnership has built more than 10,000 dams to help hold water on 24

management, as well as water quality, carbon sequestration, and improved landscapes for people and wildlife.

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

the moors and trap peat sediment. It has also reintroduced sphagnum moss to 10 square kilometres of moorland. This moss was virtually wiped out by pollution dating back to the industrial revolution and is essential for the formation of new peat.

Sir James saw areas that have been planted with native woodlands in the steep cloughs leading down from the moors. This is part of 2.7 square kilometres of new clough woodlands – thought to be one of the largest native woodland creation schemes in the country. Working with the Forestry Commission, Natural England, Environment Agency, National Trust and RSPB, the project aims to provide benefits to biodiversity, downstream flood risk, water quality and enhance the landscape character.

After the site visit, Sir James Bevan launched a new briefing note on the 3 Defra funded flood-management projects at Pickering, Holnicote and Kinder Scout in the Peak District. It confirms the benefits of the measures on natural flood risk www.fadsdirectory.com

Working with the natural landscape damaged by industrialisation can reduce local flood risk, while benefiting the environment.

The partnership approach here in the Peak District is providing evidence that surface roughness of revegetated bare peat slows overland water flow, which in turn reduces the risk of flooding for communities downstream. Sarah Fowler, Chief Executive of the Peak District National Park, said:

This habitat restoration covering tens of square kilometres in the Peak District National Park is replicated across the UK’s 15 National Parks. This work delivers significant services to those who live in the National Park and to the millions living in surrounding communities. Services like slowing the flow, improving water quality and storing carbon as well as bringing business innovation and engaging communities in science so together we protect these landscapes for all to enjoy. More information about the work of the partnership can be found at www.moorsforthefuture.org.uk.


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Flood Risk

CONSULTANCY

New Scottish National Centre for Resilience

The new National Centre for Resilience will be a dedicated facility that will enhance Scotland’s resilience capability to combat natural hazards. It is being funded by the Scottish Government and will be located in the University of Glasgow’s School of Interdisciplinary Studies on the Crichton campus in Dumfries. The Centre, to be opened on the 21st March, is a collaborative partnership bringing together expertise in research, training, data management and impact forecasting to inform and enhance emergency planning in Scotland. Whilst setting up the centre, resilience officials have been working on a number of areas, including how to make the best provision of care for vulnerable people during weather-related emergencies;

improved forecasting capabilities resilience research and a training scoping study and a tool to develop and maintain community resilience before, during and after flooding events. Dr Carol Hill, Head of the University of Glasgow’s School of Interdisciplinary Studies and Director of the Crichton Institute, said:

DESIGN. ENVIRONMENT. SUSTAINABILITY. Hydro International’s leading consultancy is founded on over 30 years of experience in water engineering design and implementation, with our clients served by an expert team. Our services include: • Flood Risk Management. • Flood Risk Assessments (FRA). • Site Development Design. • Sustainable Drainage (SuDS). • Water Pollution Management (WPM). • Sustainable Water Management (SWiM).

“We at the Dumfries campus of the University of Glasgow are delighted to have been awarded the contract to host this multi-disciplinary centre and to be able to play an important part in supporting national planning for resilience to natural hazards. The NCR will, I hope, become a national centre of excellence in its work to strengthen co-operation amongst academics, responders and resilience partner organisations as well as communities and individuals operating in the field of resilience.”

Key projects will include the development of science notes supporting science communications and community resilience for specific hazards, such as flooding and building relationships and cooperation with other resilience partners in the EU. In the longer term, new hazard forecasting tools using cutting edge science to better predict natural hazards will be developed with key partners such as the Met Office, SEPA (Scottish Environment Protection Agency) and the British Geological Survey through the Natural Hazard Partnership.

For further information call 01275 337966 or visit www.hydro-consultancy.com

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27


Flood Risk

Essential flood defence works in Somerset

Phase 1 involved dredging from the bank using multiple machines including two CAT330 long reach with 22m reach In November last year flood protection work began on the River Parrett, after the award of a dredging contract by the Parrett Internal Drainage Board (IDB) and funded by Somerset Rivers Authority (SRA). The contract is for 2.2km of maintenance dredging upstream of Northmoor pumping station and was awarded to WM Longreach, with sister company WM Plant Hire providing the long reach equipment. These works follow on from previous dredging on the Parrett and Tone Rivers in 2014 which was identified as producing the biggest flood reduction risk on the Somerset Levels & Moors.

pontoon, loading barges in the river with the silt deployed into nearby fields.

In phase 1 initially a 30 tonne, 18 metre reach machine was used but as the working area became restricted an alternative approach had to be adopted. Where there were no access constraints a 45 tonne, 22 metre reach was employed and where access was an issue the smaller 21 tonne long reach excavator with 17.5 metre reach was used. Assessment and ground investigation by a geotechnical

engineer for the stability of the working platform was carried out to satisfy the Client. The initial concerns that the additional weight of the larger machine might compromise bank stability were allayed with the engineers report proving stability loadings were sufficient and the new approach worked well. During phase 1 maintaining good relationships with the land owners was key to ensuring the job went smoothly, as ultimately they were the main people affected by the works.

The work has taken place on a main river and therefore required a special agreement between the Environment Agency and the Parrett IDB for them to work using the Agencyâ&#x20AC;&#x2122;s powers.

With the variety of access issues a wide range of long reach excavators have been provided during the project with a maximum reach over 22 metres. Silt was spread on adjacent fields with the agreement of local landowners. The dredging was undertaken in two main phases: phase 1 working mainly from the banks with silt placed on the bankside; phase 2 with a machine mobilised onto a floating 28

BBC Somerset busy filming and interviewing during the initial operations

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Flood Risk

WM Plant Hire supplied the tugboat and hopper barges required to move the silt during the dredging operations

For phase 2 a floating pontoon with a 19 tonne, 14 metre reach long reach excavator was used to load hopper barges moved by a tug boat and offloaded upstream. The silt was then moved under licence to a deployment field. Despite challenges from the weather over the winter period including periods of heavy rain with high water levels, strong winds hindering the mobilisation and movement of floating plant on the river, together with high river flows, the works were successfully completed.

This determination together with the hard work of the team meant that over 20,000m3 of silt was dredged from the river during this period. The mobilisation of additional excavators to assist with the spreading of the silt ensured the successful completion of the project in March.

A smaller long reach was used to dredge the river from a pontoon in phase 2

The project attracted a great deal of local interest, with several visits from BBC radio and television, interviews with key stakeholders and even featured the dredging operations on BBCâ&#x20AC;&#x2122;s Countryfile TV programme in February 2016.

www.wmplanthire.co.uk

During phase 2 hopper barges were loaded before transporting the silt further upstream 29


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.

THE HOUSE of Lords became the rather polite battleground for an attempt to revive abandoned proposals to establish a separate local authority approval system for Sustainable Drainage Systems (SuDS) in England and remove developers’ automatic right to connect to the public sewer. Schedule 3 of the Flood and Water Management Act (FMWA) 2010 was shelved when SuDS approval in England became part of National Planning Policy Framework (NPPF) approval last April. Reviving it became the subject of a crossparty amendment tabled during committee stage scrutiny of the Housing and Planning Bill in the House of Lords on March 23.

So, it seems, Schedule 3 may be gone, but not altogether forgotten just yet. For a start, the Welsh Government is seriously considering adopting an approach much closer to the original FMWA proposals. There have also been hints that the Government may take stock of the current arrangements after they have been allowed to run for a couple of years.

Put forward in the name of four Lords, including Lord Krebs, a long-standing campaigner for SuDS and member of the Committee on Climate Change, the amendment was also given a high-profile public statement of support from six professional bodies led by CIWEM and representing 150,000 engineering, architectural and environmental professionals.

The proposal would have reinstated the Schedule 3 provisions that prevent developers from automatically connecting surface drainage to sewers and instead expect SuDS to be implemented to national standards, adopted by local authorities and overseen by a separate local authority SuDS approving bodies. Perhaps unsurprisingly, the motion was withdrawn, serving nevertheless to successfully keep the debate alive and keeping pressure on the Government to deliver on more widespread adoption of SuDS in England.

Schedule 3 – Gone but not quite forgotten yet

Just a few weeks earlier, the Lords Select Committee on National Policy for the Built Environment published its “Building Better Places” report which recommended that the Government reconsider establishing a separate approval regime for SuDS in new developments, strongly suggesting that the current arrangements were undermining the uptake of SuDS in England, because developers may use affordability as a reason to negotiate their way out of provision. Further, the Committee called on the Government to consider whether to upgrade the status of SuDS to “critical infrastructure.” The report’s conclusions and recommendations were based on more than 180 submissions of written evidence and oral evidence from 58 witnesses in 27 evidence sessions. In giving its evidence, the Construction Industry Council, for example, was highly critical of the decision to abandon Schedule 3, saying it “had created voids in policy, uncertainty in planning policy interpretation, the abandonment of the concept of drainage as ‘critical infrastructure’, no structure for the adoption and maintenance of SuDS, and no measures to address flood resilience at a local scale.” In her response to the Lords amendment, Planning Minister Baroness Williams of Trafford told the committee that the Government was meeting with key stakeholders to gauge their views on how the changes were bedding in and added: “we intend to have a more in-depth review in a year’s time, which will be two years post change.” What strikes me most about this latest episode in the story of SuDS politics and policymaking is the strength of the professional body of opinion, both through the evidence of the Lords select committee and through the CIWEM statement, which represented the views of the ICE, RIBA, IES, Landscape Institute, CIEEM and the Environmental Policy Forum. There would seem to be serious doubts about the ability of the current system to deliver the outcomes we all want to see. At the end of the day, as professionals, whatever the Government policy, we must doggedly focus on

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

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Surface Water Management key elements of SuDS delivery that will deliver the best and most practical outcomes. As was pointed out during the Lords debate, SuDS are not usually more costly than conventional alternatives, especially when pragmatic and practical designs are achieved, by selecting from a full toolbox of components, both natural and proprietary. Equally, SuDS delivery must focus rigorously on provision of robust through-life maintenance and servicing schedules that will ensure ongoing adoption and support of the local communities where they are installed. If we end up with poorly maintained or unadopted schemes, SuDS uptake will most definitely be compromised.

We do, at least, have in place a wealth of technical standards and guidance across the UK, and a growing body of best practice experience. This latest skirmish at the heart of our Government system only serves to demonstrate the responsibility of us all as professionals to keep the debate alive and kicking.

Engineering Nature’s Way is currently conducting its own survey of professionals to assess their impressions of uptake of SuDS in the UK, so it will be interesting to see how professionals ‘on the ground’ are seeing the progress of implementation. For more information on the survey see page 33 or visit www.engineeringnaturesway.co.uk.

Click HERE for The State of the Nation Survey

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

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After flushing


Surface Water Management

SuDS: The State of the Nation Survey

“State of the Nation” Survey Tests ‘Grass Roots’ Confidence in Future SuDS Delivery

Click HERE for

The State of the Nation Survey Engineering Nature’s Way, the knowledge-sharing initiative for Sustainable Drainage Systems (SuDS), is launching a national survey of professionals working with SuDS at the ‘grass roots’ to assess confidence levels in progress being made towards best practice implementation across the UK.

Important new regulations and technical guidance has been published during the past 12 months for England, Scotland and Wales. SuDS: The State of the Nation 2016 sets out to investigate whether industry professionals believe current policy and practice is now sufficient to enable them to deliver effective flood risk and surface water management schemes. The survey seeks opinions on the future prospects for SuDS from a wide range of professional disciplines including consulting engineers, housebuilders, local authority engineers and planners, contractors and environmental agency staff. To take part in the survey visit https://www.surveymonkey.co.uk/r/FFCMQL9.

The Engineering Nature’s Way initiative provides a forum for best practice information and opinions on SuDS policy and practice in the UK, co-ordinated by Hydro International. It is centred on a popular website www.engineeringnaturesway.co.uk and twitter feed @engnaturesway.

Alex Stephenson, chair of the British Water Sustainable Water Management Focus Group and Group Market Development Director of Hydro International, said:

“When Engineering Nature’s Way conducted its first SuDS: The State of the Nation Survey in 2012, the results prompted a great deal of industry debate. We want to see if views have changed, broaden access to participation in the survey and encourage as wide a range of professionals as possible to offer their views.

“I think we all want to see Sustainable Drainage Systems become commonplace in our towns and cities, wherever we are in the UK. How will the different regulations and standard technical guidance now published in the devolved regions influence the ability and opportunity of

professionals to deliver best practice schemes?

“We want to know whether people are satisfied with current SuDS policy and delivery, and associated technical standards and guidance. We are also particularly interested to know whether people working ‘at the coal face’ of SuDS believe enough has been done to ensure adoption and long-term maintenance.” The past year has seen a number of new regulations and associated standards and / or guidance documents published, which aim to set the framework for future delivery in the devolved regions. This includes: Changes to English planning regulations and publication of Non-Statutory Technical Standards for sustainable drainage systems in March 2015.

Updated planning policy and publication of recommended non-statutory standards for sustainable drainage in Wales in January 2016. Publication of the Water Assessment and Drainage Assessment Guide (WADAG) by the Scottish SUDS Working Party in January 2016. Publication of the updated CIRIA SuDS Manual (C753) in November 2015. Alex Stephenson continues:

“The survey will also seek views on whether the potential of SuDS to help achieve good environmental water quality across the UK has been sufficiently addressed.

“Much of the guidance has indicated the importance of using a wide and mixed toolbox of surface water drainage components to achieve SuDS objectives as part of a surface water management train. We’re interested to hear how professionals view the role of manufactured or proprietary systems in helping to engineer consistentlyperforming and compliant schemes, and if they can be used to enable more Green Infrastructure.” A full report of the results of the survey will be published on the Engineering Nature’s Way website. Find out more about the 2012 State of the Nation Survey and the Round Table debate held in London on 21 December 2012.

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Surface Water Management

Walthamstow Stadium development SuDS solution The number of brownfield sites now being converted

for alternative residential or commercial use is on the rise with the Government pledging £2 billion to ensure these sites are prioritised by developers, with many projects being completed six months earlier than projects on greenfield sites. Building on brownfield land often raises acute water management challenges such as the risk of water contamination, and the effective control of surface water run-off.

The water management solutions team at Polypipe offer the most comprehensive range of water management products for use in large-scale pipeline, attenuation, infiltration and stormwater treatment projects, and provide planning, design assistance and technical onsite support. With the effective re-use of brownfield sites now a key objective of house building policy, Polypipe’s expertise was put to the test at the multi-million pound redevelopment of a famous North East London landmark. 34

Suitable SuDS for a site that had gone to the dogs

Polypipe worked with developers Quadrant Construction, at the former Walthamstow Dog Stadium, which is being redeveloped into 294 new homes with a focus on sustainability. Water management features at the development include sustainable drainage features, brown roofs and permeable paving. At the outset of the build, the iconic site featured both contaminated land at shallow depths and a high water table, which meant that prior to the redevelopment, surface water discharge was unrestricted and flowed into the adjacent River Ching.

A Polypipe Permavoid geocellular shallow stormwater management system holding 1.5 million litres of water has been installed to meet Environment Agency requirements for a need to ‘make space for water’, and to reduce existing urban stormwater run-off by 80%.

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Surface Water Management

This SuDS solution will allow the site to be capable of handling rainfall in the event of a ‘1 in 100’ year storm, in line with current climate change planning. With the Government and local authorities working to bring forward the time in which brownfield sites can be revitalised for use as a residential development, there is a growing demand for products and systems that can be easily installed into reclaimed land. Polypipe placed its high strength Permavoid at the heart of the solution to form a sub-base replacement system beneath 4,500m2 of permeable paving. This will provide 1,500m³ of water attenuation to meet the requirements previously agreed with the Environment Agency at the pre-planning stage. The design features 150mm deep Permavoid cells, with Permafilter geotextile laid on top between the cells and the permeable paving. The Permafilter acts as a barrier to capture and treat surface water run-off at source from the permeable paving above, before entering the tank. The sides and the bottom of the tank are wrapped in a geomembrane to allow for the stormwater to be attenuated, before discharging at a rate as agreed with the Environment Agency into the river with the use of flow control devices. The Permavoid cells boast a 95% void ratio and incorporate a unique jointing mechanism to form an interlocking raft with high compressive and tensile strength. Despite being light in weight, the innate strength of the Permavoid cells allows them to support structural loads across heavily trafficked areas, making them suitable to withstand the compressive and dynamic loads produced by vehicles at the site.

The inside track from Polypipe

Sean Robinson, Permavoid Project Manager at Polypipe

In areas of hard standing without permeable paving, Polypipe’s Permachannel and Permavoid Biomat have also been installed to capture, treat and attenuate surface water run-off. Permachannel acts as both a surface water collection point and treatment system that intercepts silt and oil.

Water is then discharged from the side of each Permachannel into Permavoid Biomat cells, which are wrapped in a geomembrane to provide attenuation. Permavoid Biomat comprises of a tri-laminate low density composite, the biomat floats on the water to intercept and treat any residual emulsified oils that may still be present in the surface water run-off from the road above, allowing only treated water to be discharged into the local watercourse.

“This project provided the opportunity to showcase why Permavoid works so well in sub-base replacement projects. The system’s 95% void ratio meant that the design met Environment Agency requirements, even with the high water table and contaminated ground conditions found on site.

“Providing a water management solution at shallow depths can bring a whole host of advantages, not least decreasing installation times and eliminating the need for the removal of large amounts of contaminated excavated materials from site, which is why Polypipe are increasingly called upon to provide solutions of this nature. “Riverside apartments and housing is in high demand for house buyers, particularly in towns where regeneration is a large driver for projects. With Government pressure to convert more brownfield sites into good quality housing, these sites are an attractive investment for house builders and developers. As a result, projects that need a comprehensive water run-off solution that manages, rather than exasperates water contamination risks, such as at the Walthamstow Stadium development, are becoming increasingly common for the Polypipe team to tackle.”

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Surface Water Management

Long-Awaited Northallerton Flood Defences Use Sustainable Vortex Technology A £3.1million project to build a long-awaited scheme to help reduce the risk of flooding in Northallerton has been completed. The scheme works by storing fluvial flows upstream of the town which will create space in the culverts in the town for the surface water to drain away.

The North Yorkshire town and surrounding villages have been plagued with flooding since the early 20th Century, with major floods most recently in 2000, 2008 and 2012 that caused widespread disruption and damage including to the town’s Friarage Hospital.

When funding was finally secured after a long wait, the Environment Agency wanted to develop a scheme that was sustainable with low-maintenance needs and conforming to SuDS principles of holding back flood waters on the outskirts of the town and discharging flows safely into the town’s culverted watercourses at a controlled rate. The solution designed is based on two large HydroBrake® Flood Alleviation vortex flow controls, installed in newly-refurbished culverts on the outskirts of the town. They enable excess water to be held back in specially built flood storage basins on the approach to the culverts.

“The Sun and Turker Becks have repeatedly overtopped and threatened the town,” reports the EA area project manager Ian Cooke. “That’s why, after consultation and looking at similar successful schemes in other areas, we decided to use upstream storage to reduce the flooding risk.

“The resulting scheme needs very low maintenance, and is resistant to blockage. Our chosen solution meant that we used vortex control technology. In addition, the ability to carefully-size the flood allevation vortex flow controls means we could minimise the back-up storage requirements, even under high rainfall conditions. As a result, the risk of the farmland on the outskirts of Northallerton flooding and threatening nearby developments and the town centre will be minimal in future.” 36

Flood Risk

The Northallerton catchment, with the villages of Brompton and Romanby is in a low lying river valley, surrounded by steep, well-drained agricultural land which makes it susceptible to flash flooding.

Largely culverted, the Turker and Sun Beck watercourses run through suburbs and the centre of the town, causing flood threats to amenities including Grade II listed buildings, conservation areas and listed monuments as well as the Friarage Hospital. At times of peak flow, excess floodwaters can overtop the watercourse in the agricultural land on its approach to the culverts, sending flows to cause flooding in the East of the town. The rivers in the catchment are constricted by their channel capacity, bridges and culverts and recent CCTV surveys have revealed some were in a poor state of repair, or could be threatened with collapse should flows continue at high volumes. As part of the wider flood alleviation scheme, the Environment Agency undertook a programme of repairs to rectify these defects in advance of works to create the storage areas.

Lower flows would also reduce back-ups in the remaining combined sewerage entering the culverts. On top of this, frequent floods have already necessitated the ground floor of Friarage Hospital to be reconfigured so as to reduce major disruption from flooding, although it remains vulnerable.

Hidden Protection

To reduce the risk of flooding to about 170 properties, the EA has adopted a scheme designed with advanced selfactivating vortex flow controls to protect against a minimum 1 in 75 year fluvial flood event. Detailed hydraulic modelling was conducted for the Northallerton catchment before designing the new scheme. Ian Cooke continues: “The scheme is designed to also improve protection to the area from flash floods,”

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Surface Water Management

“The design meets sustainable principles, by attenuating (holding back) excess flows and allowing them to discharge at a controlled rate.” “The Hydro-Brake® FAS controls have been installed in specially-constructed below-ground concrete culverts. The storage basin will be grassed over so the flood defences tie in with the local agricultural landscape.”

The cone-shaped Hydro-Brake® Flood Alleviation vortex flow control devices installed in the culverts are based on an industry-standard method of flow attenuation, most frequently used in much smaller dimensions as part of urban surface water drainage designs. Hydro’s UK Stormwater Operations Manager Andy Kane explains:

“The Hydro-Brake® Flood Alleviation vortex flow control’s internal geometry is designed so that water can flow unrestricted through the device for as long as possible, before a self-activating vortex is triggered when the water reaches a pre-determined head. In a flood, water is throttled back and released at a controlled rate. “We have individually-sized both the controls at Northallerton to create an optimal internal geometry that delivers best-possible hydraulic performance with the minimum amount of upstream storage.

“Compared to alternative flood control devices such as orifice plates or penstocks, the vortex flow controls have a larger opening, so more water is able to flow through the culvert unimpeded, meaning less flood storage is needed. At the same time, there is less risk of blockages. This, together with fact that the flow controls have no moving parts or power requirements, means they require minimal maintenance.”

On the Turker Beck, an 857 mm outlet diameter HydroBrake® Flood Alleviation vortex flow control has been installed with a maximum design flow is 1 cu.m./sec , requiring a back-up storage volume of 12,500 cu.m.. The Sun Beck installation, sited upstream of the junction with Turker Beck, has a 684 mm Hydro-Brake® Flood

Alleviation vortex flow control with a maximum design flow of 0.58 cu.m./sec and requiring 1,500 cu.m. of backup storage.

To protect the inlets of the flow control devices, a series of new stepped trash screens have been installed. The low flow channels to the control device’s back-up storage areas are sited in the original stream beds. Shallow grassed banks lead up to the same level as the original banks, thereby remaining unobtrusive while providing the amenity of grass meadows outside of high flood events.

Technology Opportunity

The installation at Northallerton follows successful flood alleviation schemes built on the White Cart Water in Glasgow, the River Douglas in Wigan and at Weedon Bec in Northamptonshire since 2002. “The Northallerton scheme demonstrates the versatility of Hydro-Brake® Flood Alleviation technology to deliver a sustainable solution to controlling flood risk, in line with SuDS principles. As funding becomes available for other planned flood defence schemes across the UK, we hope the technology can provide low maintenance and minimal storage solution,” Andy Kane adds. For more information about the Hydro-Brake® Flood Alleviation and other stormwater and wastewater management products please call 01275 337937, email enquiries@hydro-int.com or visit www.hydro-int.com.

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Surface Water Management

Controlling Flood Risk on Devon’s New Link Road

Controlling surface water flooding was a vital consideration in planning and building Mid Devon’s new £8.42 million A3072 Crediton Link Road. Vortex flow control technology was integral to a solution that managed surface water flows across undulating topography to protect local rivers.

By using Hydro-Brake Optimum® vortex flow controls as part of a SuDS approach, South West Highways (SWH) & Devon County Council (DCC) were able to meet Environment Agency requirements for discharge limits at a 1 in 100 year level and reduce flood risk in nearby rivers Creedy and Yeo.

The River Creedy is to the east of the road, and not, itself, classed as sensitive to flooding. However, it also feeds the River Yeo, which lies to the south of the link road, which is classed as being at serious risk of flooding, so any changes to the surface water flow would need considerable care in planning the drainage strategy.

“The new link road was built up and over the steep Downes Head Hill to link the A377 with the Lords Meadow Industrial Estate,” said SWH Site Agent Stuart Cheesman. “This meant DCC had to design discharge points at either end of the road into a variety of catchments and detailed the allowable design head and discharge at each of the discharge points which then allowed Hydro Brake Optimum flow control units to be 38

designed by Hydro International. The complexity of the drainage system on the road gradients and the time constraints of the project made it appropriate to install the drainage pipe system at an early stage, including the concrete manhole chambers to house the Hydro-Brake Optimum® vortex flow controls but not install the hydro brakes units themselves. “Three Hydro-Brake Optimum® vortex flow controls were fitted with maximum discharges of 5 l/s, 20 l/s and 30 l/s via storage tanks, a swale and an attenuation pond to the field drains and eventually the Rivers Creedy and Yeo,” added Stuart Cheesman. “Final changes to the drainage design during construction necessitated having bespoke connections made for the flow controls that could be retrofitted into manholes that had already been installed. Hydro were very helpful in making the adaptions.” Pollution and congestion from the heavy goods vehicles has been a longstanding blight in Crediton. Through an Air Quality Action Plan, Devon County Council planned to improve the situation by offering an alternative route outside the town. Following two years of planning and consultation, construction on the new link road began in July 2013 with the opening in October 2014. For more information about the Hydro-Brake Optimum® and other stormwater and wastewater management products please call 01275 337937, email enquiries@hydro-int.com or visit www.hydro-int.com.

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Surface Water Management

Hydro International acquires Hydro-Logic, adding monitoring products and services to its water management portfolio

Hydro International has acquired Hydro-Logic Ltd (trading as Isodaq Technology) and Hydro-Logic Services LLP, expanding its range of water quantity and water quality management products with the addition of monitoring products and data, analysis and advisory services that will provide customers with new insights to help improve water management, reduce flood risk and minimise pollution. “This acquisition is transformative both for Hydro International and for the industry,” said Michael Jennings, Chief Executive of Hydro International. “Hydro-Logic technology and expertise removes uncertainty and ambiguity and will enable us to offer unprecedented insight into the design, installation and operation of water management solutions, saving money for customers, reducing risk and helping them to protect the environment.”

Isodaq Technology’s products provide instrumentation and information systems for water environment monitoring applications, including data logging, telemetry and software. These products add a new dimension to Hydro International’s capabilities, providing insight into the character of water to help customers better design, install, operate and maintain water management products, and helping Hydro International to enhance and improve its flow control and water treatment products to better meet customer needs.

and expertise broaden and deepen every aspect of our business,” said Michael Jennings. “The monitoring products will help our customers to understand their water quantity and water quality in completely new ways, and the data, analysis and advisory services will enable us to design solutions that meet customer needs more closely than ever before.” To learn more about Hydro International’s new data logging, monitoring and telemetry products visit isodaq.co.uk; to learn more about Hydro International’s new hydrological and water management services visit hydro-logic.co.uk.

Nature’s perfect curve

Hydro-Logic Services LLP provides specialist hydrological and water management consultancy, often using Hydro-Logic Ltd products to collect and analyse real-world data and applying the findings to support planning decisions, optimise hydraulic and network design, increase water system efficiencies and reduce flood and pollution risk. These new services add a comprehensive data, analysis and advisory service to Hydro International’s existing services portfolio, and bring new expertise to the Hydro International team.

“We're looking forward to being a part of an expanding global business,” said Rod Hawnt, Managing Director of Hydro-Logic Ltd. “I'm immensely proud of what we've achieved as Hydro-Logic, but joining Hydro International is going to take our products, services and our people further than would otherwise have been possible.”

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.

“Adding Hydro-Logic's products and services represents a step change in our capability, and the new technologies www.fadsdirectory.com

Call: 01275 337937 Try the Design Tool at: www.hydrobrakeoptimum.com

39


Surface Water Management

Mastenbroek

Tel: 01205 311313 www.mastenbroek.com

Land Drainage

Is it crunch time for clay land drains? When grants for on farm drainage were suspended in 1984 farmers largely lost interest and their spending dried up to the affect that replacement schemes skipped a generation according to Justin Morfoot of land drainage specialists William Morfoot. “Thirty years on, clay land drains are failing and farmers want their increasingly wet areas back into productive cultivation.”

Whilst land drainage has always required grade control, GPS systems have revolutionised the practise, saving the operator time and giving him the confidence that all work is to a preset optimised standard.

William Morfoot initially trialled the Trimble WM Land Drainage package in September 2014 retrofitting it onto a Mastenbroek 2015 trencher replacing the existing laser system.

Apart from achieving a remarkable level of accuracy, the operator no longer had to stop every 20-25m to determine his settings and % grade as demanded by the laser. Moreover his progress was no longer limited by weather. Laser beams can be refracted by drizzle and fog and their tripod buffeted by the wind. “We could carry on working even in early mist where you could not even 40

see the trencher from across the field!” says Justin. “Whereas the laser had a range of 300m, the GPS transmitter’s radio signal can reach 3Km so we can work without having clear sight of it. Relocating and recalculating the laser meant up to 45 minutes of hard work”.

General degradation and the impact of heavier field machinery have led to clay pipes giving way to all plastic land drains. These are laid at between 800mm and a metre deep where they can avoid damage from deep cultivation and optimise their take up of moisture. The clay pipes being replaced by plastic has allowed them to be jetted out more effectively.

“The GPS takes an elevation reading every 3m compared to 20 to 25m with a laser on each and every survey run the trencher makes. This helps each individual drain to be optimised to the field conditions for depth and grade, consequentially leading to either a saving in backfill material used or better optimised placement of the expensive resource” explains Fred Clarke of Mastenbroek.

In comparison to laser based operation, GPS is relatively fast. According to driver operator Brian Allen working with laser he would www.fadsdirectory.com

average 1200 to 1500m a day, although he has achieved 3200m in perfect conditions. Since adopting GPS, daily outputs average 2000m to 2500m and at best 4700m! Most importantly “there’s a lot less walking about!” according to Brian. “And it has removed the element of guess work as you had to work by eye and experience much of the time, let alone human error in inputting. I can now lay within millimetres of an existing drain. The Trimble’s operator warning system simply won’t allow me to adopt settings it considers not viable.” Back at the office, all data is downloaded and held on computer for future traceability. This is particularly important on cable laying projects and a lot of Utilities will only allow GPS trenchers on their projects.

“With the move to precision farming, farmers expect contractors to have GPS or they don’t want us on site” says Justin. “The old thinking has been proven wrong. The combination of vertical and horizontal accuracy means there’s no going back. Our performance in the field is controlled by up to 20 satellites! “The initial trial was so successful that we had our second Mastenbroek


Surface Water Management

Brian Allen, operator (above) and Fred Clark, Mastenbroeks (below)

machine (3020) fitted with the Trimble system within the year. This allows us to price work more competitively and gives us confidence we can deliver on timings” says Justin. “As a OEM and Authorised Trimble Reseller, Mastenbroek have been instrumental in developing and fine tuning the Trimble system to the

challenges of land drainage” explains Fred Clarke “meaning we can offer our GPS ready trenchers to overseas users as well as UK contractors.” The ‘bottom line’ for the farmer is redundant land returned to productivity and the knowledge that his land drainage is fit for purpose, now and for years to come.

Get on the FADS Directory with our Gold, Silver or Bronze packages

Gold

Silver

Bronze

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41


River & Wetland Management


River and Wetland Management

Rivers to benefit from proposed legislation Rivers across England could benefit from new Government plans to help address declining freshwater fish stocks so native species can thrive.

Migration within rivers and between rivers and the sea is an important part of the lifecycles of many species of fish native to England. But these journeys can be impeded by structures like weirs or water intakes, hampering fishes’ efforts to reproduce or feed. In March the Government is set out proposed new legislation to remove obstructions or build fish passes to provide a route around or through these hurdles. These passes already exist on some rivers across the country, as do protective screens to stop fish getting trapped in water intakes—but more action is needed.

New legislation to facilitate fish passage could help recover stocks of species like salmon, which are born in our rivers and swim to the Atlantic to mature for up to three years before returning to the same river to spawn.

Speaking as he visited the River Fowey in Cornwall with The Rivers Trust to see first-hand work that had improved fish passage, Fisheries Minister George Eustice said: Improving and restoring our rivers is key to the Government’s vision for a cleaner, healthier environment—but we can’t do this alone. That’s why the work of organisations like The Rivers Trust is so important, and we are increasingly working in partnership to take action to protect iconic species like salmon, including by ensuring them safe passage in our rivers.

Addressing the decline in fish stocks not only benefits the environment, but boosts the economy too, improving angling opportunities and benefitting commercial freshwater fisheries, helping the rural economy to thrive.

Increasing freshwater fish will mean anglers can enjoy catching all kinds of different species, both in tranquil riverside surroundings or surprising fishing hotspots in our towns and cities. Four million anglers in England and Wales spend £3 billion on angling every year, supporting around 37,000 full-time jobs. Better angling opportunities can lead to higher revenues from tourism, helping to build a thriving rural economy.

Fish passes have been used for decades to help ensure fish can make their long journeys through England’s rivers. The Environment Agency works with organisations like the Rivers Trusts and others to get fish passes installed, and remove some obstructions entirely.

Proposed new legislation will make taking action to improve fish passage a legal requirement for some critical obstructions, aiming to address obstacles that still prevent or delay fish on their journeys.

Since 2009 the Environment Agency and partners have installed 82 fish passes on England’s main salmon rivers, which combined with removing or altering other barriers have opened up 5,767 kilometres of river and reduced or removed 44 unsustainable water abstractions on salmon rivers.

The Government works closely with partner organisations like The Rivers Trust to enhance the biodiversity of our watercourses and manage fish stocks. At the River Fowey in Cornwall, the Westcountry Rivers Trust is working with the Environment Agency and the Angling Trust to engage and empower anglers and riversidedwellers to manage and improve fisheries. These kinds of locally-led partnerships are vital to the future of our environment, and will form an essential strand of future plans to protect and enhance our natural surroundings through Defra’s new 25 Year Environment Plan, to be published later this year.

The 5 point approach

The new five-point approach to salmon conservation developed by the Environment Agency and partners including The Rivers Trust sets out measures to benefit salmon, including: • reducing exploitation by nets and rods • removing barriers to migration and enhancing habitats • improving water quality

• safeguarding sufficient flows

• improving marine survival to increase stocks

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43


River and Wetland Management

First weir removed by the Medway catchment partnership Before

Fish passage and habitat along the River Teise in Kent has been boosted thanks to a joint project by the Environment Agency, the South East Rivers Trust and the Kent High Weald Partnership.

Harper’s Weir near Goudhurst has been removed in the £30,000 project, which was funded through Defra’s Catchment Partnership Action Fund. The project has been led by the South East Rivers Trust, with input from the Environment Agency and the Kent High Weald Partnership. The project also received support from the landowner, Teise Anglers and Owners Association and Teise Catchment Improvement Group.

The weir was the first to be removed by the Medway Catchment Partnership. Its removal has improved fish passage and increased biodiversity in the area. The weir also prevented the movement of gravels, which are a vital habitat, downstream, so now the surrounding habitat for species such as trout has been greatly improved.

After

This is the first of many weirs to be removed from the Medway catchment and it means that the river will behave more naturally, as well as improving fish passage and important habitat for the local wildlife.

Jason Adams, Medway Catchment Coordinator Environment Agency

44

Removing the weir fully will be a step towards meeting Water Framework Directive (WFD) objectives and will reconnect the river upstream and downstream. The Water Framework is a European Directive which requires us to do work to improve our local waters for people and wildlife, by working with local organisations and communities.

Ian Johnstone Kent High Weald Partnership

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This is an extremely exciting project and we have been working closely with many partners including the Medway Catchment Partnership, Environment Agency, Teise Anglers’ and Owners’ Association and the landowner on the weir removal and river restoration.

After the weir is fully removed we will allow the river to settle down for a couple of months and then begin a programme of habitat enhancement works. These will ensure the river is improved for fish, wildlife and angling’.

Rosie Pyper, Project Manager South East Rivers Trust


River and Wetland Management

Improving water quality and habitats in Peterborough Wildlife, water and communities are set to benefit from improvements to the environment starting this week in Peterborough, led by the Environment Agency.

The Werrington Brook Improvements programme, starting with a 417-metre stretch of Marholm Brook, near Lincoln road, will see work take place to improve water quality and create better habitats. The five-year partnership between the Environment Agency, Peterborough City Council and the charity Peterborough Environment City Trust will include work to replicate the way a natural stream flows. At the moment, during dry periods, the area suffers from shallow water, low flows and lacks important dissolved oxygen which is needed for healthy habitats and wildlife.

Gravel edged berm immediately after construction

The work will include increasing the number of meanders, reshaping banks, creating a small wetland, and introducing several natural river features like riffles, berms and pools. These will all work together to create natural processes that, in turn, will help clean the water, create better wildlife habitat and keep the stream healthy.

Rob Price, Catchment Coordinator at the Environment Agency, said:

The Werrington Brook Improvements programme will create an even better environment for people and wildlife, bringing additional social, well-being and economic benefits to the area.

Gravelled berms immediately after construction

Healthy rivers and habitats encourage a cleaner environment which results in a more diverse and healthier wildlife, making green spaces even more attractive for all to enjoy. In turn, people make the most of them, like taking more walks, exploring and enjoying their surroundings which helps improve health and well-being.

The works follow a public consultation held last winter and form part of a wider programme to deal with pollution and encourage communities and businesses to engage closer with the water environment. Further improvements are planned for eight more stretches of water between Marholm village and Cuckooâ&#x20AC;&#x2122;s Hollow Lake â&#x20AC;&#x201C; which Peterborough City Council is currently carrying out large scale maintenance to remove some of the reeds and reduce silt in the lake to improve water flow.

Filled berm naturally vegetated.

This work will help improve and keep the national water quality environment standards of the streams in this area. The success of the improvements will be closely monitored and used to help plan further developments in Peterborough and elsewhere in the country.

The programme is part funded by Environment Agency and Peterbrough City Council who aim to attract other partners to help deliver the work.

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Naturally vegetated filled berms creating meander pattern 45


River and Wetland Management

Bedford Pumps And Peter Brett Associates Save Stakeholders £3m On Fish-Friendly Scheme Bedford Pumps Ltd, the UK’s leading manufacturer of large submersible and conventional pumps for the Land Drainage industry, has delivered a Fish Friendly pumping station to Cambridgeshire District Council at Webb’s Hole Sluice in the village of Over, Cambridgeshire.

Webb’s Hole Pumping Station is unique in so far that each stage of the design process has been carefully considered with regard to its impact on the safety of eels and fish. This brand new station has been constructed with every element of the pumping station design, from the outfall to the pipework, evolved to mitigate any damage to the eels and fish that are present in the river. Webb’s Hole Pumping Station is therefore the first in the country to fully embrace the Eel Regulations of 2009.

A new pumping station was required at Webb’s Hole in order to lift flows from the upstream side of the sluice to the downstream/tidal side when the River Great Ouse is in flood. The pumping station, along with additional upgrades to the watercourse, will provide mitigation for the discharge of treated effluent from up to 10,000 dwellings in Cambourne and Northstowe which necessitate an expansion of the water recycling centre at Utton’s Drove. 46

Bedford Pumps worked closely with design consultants and project managers Peter Brett Associates, contractor J Breheny, and delivery partner JJ Gallagher, from design to implementation. The innovative and efficient project design, and the strong team partnerships that have been formed over several similar projects, delivered £3m capital savings on the initial stakeholders’ framework estimates. The final design contained the following characteristics: long radius bends on the pipeline; low velocity/low loss; submerged discharge; fish friendly siphon breaker valves with unique paddle arm meeting “streamlined” requirement; sub bell-mouth flow splitters and of course fish friendly pumps. Bedford Pumps manufactured, installed and commissioned two DAF (Fish Friendly Direct Drive Axial Flow) pumps for Webb’s Hole. The pumps, one duty and one assist, have been installed in a vertical suspended position with a 45 degree angle discharge. Each are powered by 30 kW 6 pole electric motors through a gearbox with an external PTO facility, which offers the ability to drive the pump by tractor in the event of a power failure. Each pumpset will discharge 534 l/s at 5.6m head.

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River and Wetland Management Bedford Pumps Fish Friendly pumps have proven credentials awarded from independent research consultants in the field of water management, VisAdvies BV, following extensive and stringent trials. The tests prove conclusively that Bedford Pumps’ range of submersible and direct drive pumps are fish and eel friendly with no direct mortality observed from exposure to the pump. Copies of the official report which state that Bedford Pumps have manufactured the “best fish friendly pump on the market” are available on request. Bedford Pumps’ Fish Friendly pumps cover from 400 to 9,000 l/s at 2m to 14m head. Fish Friendly pumpsets are available as submersible, mixed flow or direct drive variants.

For more information contact Lucy Ogden. Tel: 01234 852071 Email: lucyo@bedfordpumps.co.uk

Industry Award Winners!

For their part in the Webb’s Hole sluice project, Bedford Pumps were winners of the prestigious Environmental Contribution of the Year category at the 2016 Pump Industry Awards which took place on Thursday evening, 10th March.

The accolade was presented during a glittering Awards Ceremony held at the Crowne Plaza Hotel, Heythrop Park, and hosted by BBC News Presenter, Mary Rhodes. The award was one of eight presented on the night.

Bedford Pump’s received their Award for their work on a Fish Friendly pumping scheme which saved Stakeholders £3M. Bedford Pumps’ Fish Friendly pumps successfully pass eels and fish in compliance with the EU Eel Regulations. For this scheme the company worked closely with Peter Brett Associates to evolve the civil engineering and pipeline

design at Webb’s Hole Pumping Station to carefully mitigate damage to eels and fish whilst at the same time delivering stakeholders £3M in capital savings against their national framework estimate. The station, which also includes the creation of some bird habitat, is the first of its kind to fully embrace the regulations from concept through to commissioning.

The Pump Industry Awards 2016, held in association with the BPMA, not only ensures that the companies www.fadsdirectory.com

involved receive recognition for their achievements, but with the aid of a charity raffle also manages to raise funds for charity. This year they raised a staggering £1800.00 for WaterAid.

For further information please contact Lucy Ogden, Marketing Manager for Bedford Pumps/Hidrostal Ltd. E: lucyo@bedfordpumps.co.uk Website: www.bedfordpumps.co.uk / www.fishfriendlypumps.co.uk Tel: 01234 852071 47


River and Wetland Management

England’s rivers restocked with a record breaking number of fish Record-breaking numbers of coarse fish were released into England’s rivers in 2015, the Environment Agency has revealed.

Last year was the best year ever for the Environment Agency’s specialist fish breeding farm in Nottingham. Experts stocked more than 452,220 fish and 1.3 million larvae into rivers all over the country. They were all bred

at the Environment Agency’s Calverton fish farm. Calverton is the Environment Agency’s principal supply of coarse fish for restocking. Every year for the last 31 years the farm has produced up to 450,000 fish of nine species for restocking into rivers following pollution incidents or to help restore fish stocks in rivers where numbers are low. All of its work is funded by rod licence income. Fish farm team leader Alan Henshaw said:

Many of our industrialised rivers have improved dramatically in water quality in the last 30 years and concerted restocking from Calverton has accelerated the restoration of natural fish stocks and viable fisheries. Last year was no exception and, while it wasn’t a good summer for getting a tan, it was perfect for growing fish.

Growth and production rates of fish that have been grown on the farm for 18 months have been the highest recorded at Calverton. Many rivers and lakes throughout England have benefited from these stockings and the quality of the fish is a testament to the hard work and professionalism of the staff.

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River and Wetland Management

Some notable stockings that took place include: 2,800 Barbel across the Great Ouse and 1,000 into the River Nene in Anglian region.

19,000 mixed Chub, Dace, Barbel and Roach across the River Sow and River Tame in the Midlands. 14,500 mixed Chub, Dace, Bream, and Barbel into the Yorkshire Derwent.

7,000 mixed Barbel and Chub into the River Tees in the North East.

9,000 mixed Chub, Dace and Roach into the River Alt in the North West. 28,500 mixed Bream and Rudd into Birchmere Lake in London. 32,700 mixed Chub, Roach, Barbel and Bream across the River Brue and River Sheppey in the South West.

After a few weeks they are stocked into the onsite ponds until they are ready to be released into the wild. The process takes approximately 18 months from the egg stage to releasing the young fish into the wild. In 2015 the number of each species released was:

The fish breeding process is complex. Staff at Calverton remove the sperm and eggs by hand from the fish and the eggs are treated with a solution to improve the rate of fertilisation. They are then laid out in specialist trays and placed inside troughs, where they receive a fresh, temperature controlled water supply. The eggs are incubated for between three and 30 days depending on species and temperature. When the eggs have hatched, the tiny larvae start feeding on minute Brine Shrimp.

Chub 53,729 Dace 46,850 Roach 67,875 Bream 66,976 Barbel 58,400 Tench 15,231 Crucians 88,034 Rudd 35,125 Grayling 20,000

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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

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River and Wetland Management

Dickie Dye retires from CW Engineering

Dickie Dye has been a larger than life figure in the flood prevention industry since June 2007 when he joined CW Engineering at King’s Lynn as Project Engineer working on weedscreen cleaners, locks and the company’s other flood prevention works. Chief Executive Nick Watling thanked Dickie for his considerable contribution to the company’s success and wished him an enjoyable retirement which starts with catching up on home decorating followed by a relaxing holiday in Cornwall. Tony Jolley, Managing Director, will be handling Dickie’s on-going projects. Call 01553 775565 for details

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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