We recently welcomed the Secretary of State for Environment, Food and Rural Affairs Steve Reed MP, the Chairman of the Environment Agency Alan Lovell, and DEFRA Director of Water Sebastian Catovsky to our Chamber Mead wetlands. During their visit, the South East Rivers Trust team highlighted the multiple benefits of working with nature to tackle river pollution and other environmental issues.
Promoting Nature-Based Solutions
During the visit, we explained how nature-based solutions significantly reduce river pollution. Moreover, we found the new Government’s interest in these innovative approaches encouraging. To help our rivers recover more widely, we emphasised the need for the Government’s support to rapidly scale up these projects.
Dr. Bella Davies, CEO South East Rivers Trust, said:“We are delighted to host the Secretary of State at the Chamber Mead wetland today. The wetland tackles sewage and urban road runoff pollution before it enters the Hogsmill River, which is a rare chalk stream, one of around 220 in the world, supporting a unique set of species dependent on the chalk-purified water. We are glad that the new Government sees the wide benefits of nature-based solutions and we urge them to take action to break down barriers to these kinds of projects and support organisations such as ours to deliver more at scale in the future.”
Governments Commitment to Water Quality
We’re pleased to hear that the new Government acknowledge the importance of improving water quality, which was highlighted in the King’s Speech, with plans for water industry reform. However, we emphasised the need for ambitious action on agricultural pollution, road run-off, and over-abstraction. We delivered this message directly to Steve Reed MP during his visit.
Exploring Chamber Mead Wetland
Steve Reed MP toured the Chamber Mead wetland with Rivers Trust CEO Mark Lloyd and SERT CEO Dr. Bella Davies. Alan Lovell, Chair of the Environment Agency, and Sebastian Catovsky, DEFRA Director of Floods and Water, also joined the visit. Chamber Mead demonstrates how nature-based solutions can vastly improve our waterways and combat river pollution. We have redirected the water from the Green Lanes Stream through a sediment trap and two wetlands instead of letting it run straight into the Hogsmill River. At the other end, we connected the wetland to the Hogsmill River downstream of the stepping stones. As they develop, the wetlands will provide diverse habitats and amenities to the Hogsmill Local Nature Reserve and improve water quality for a 200-metre section of this rare chalk stream.
The Chamber Mead wetlands help conserve the Hogsmill River, a rare chalk stream. This project cleans 250 million litres of water through natural systems, effectively combating pollution. The wetlands are part of a broader partnership between the Rivers Trust and The Coca-Cola Foundation.
Looking Ahead
The visit underscored the importance of these projects and the need for continued support. With the backing of the Government and our partners, we can achieve significant progress in restoring and protecting our rivers.
For more information on our projects and how you can get involved, visit the South East Rivers Trust website. Join us in making a difference for rivers across the South East.
Chamber Mead wetlands and their importance to the River Hogsmill were recognised at the 2024 Edie Sustainability Awards in London last night (6th March).
The wetlands were recently completed in Surrey on a stretch of the Hogsmill just south of London. They will filter pollutants and become a haven for wildlife protecting 5km of the river, which is a rare chalk stream.
Part of the Chamber Mead wetlands with the public bridge in the background
This is a fantastic example of a nature-based solution improving the condition of our rivers. The project has diverted a contaminated tributary into the wetlands, which act as a filter before reconnecting cleaner water into the Hogsmill downstream of the famous Stepping Stones.
One of only about 210 chalk streams in the world, the Hogsmill suffers from urban road runoff, raw sewage discharges and misconnected plumbing that sends drain water directly into the river. A healthy chalk stream’s pure water, stable temperature and flows provide longer growing seasons than other rivers and support important habitat for species such as brown trout and native crayfish.
Creation of the wetlands has been carried out in partnership with Epsom & Ewell Borough Council, which owns and manages the Hogsmill Local Nature Reserve, a popular greenspace which will now benefit from this new community asset.
Bella Davies, Co-CEO of the South East Rivers Trust, said: “We couldn’t be more delighted that the Chamber Mead project has been recognised by the Edie Awards. The project has been more than 10 years in development. It has brought together a wide range of partners and funders to step up and share responsibility for improving water quality in the Hogsmill river, one of the country’s rare and precious urban chalk streams.
Dr Bella Davies at the Edie Awards
“Wetlands such as these are a great way to improve water quality, especially in urban areas, in this case by filtering water from one of the Hogsmill’s headwater tributaries. This water has been contaminated by toxic urban road runoff and sewage from storm tank overflows and misconnected pipes. The water will now enter the Hogsmill after it has been cleaned by the wetlands and help bring back endangered river wildlife such as brown trout and eels.
“We’re also thrilled that the public will see the wetlands develop into a space where wildlife such as dragonflies, birds and butterflies can thrive providing more opportunities to experience nature on their doorstep.”
SERT is now preparing a series of planting days for schools, community groups and the public to take place in the Spring, as well as an open day to introduce the project to the community.
Supported by the Hogsmill Catchment Partnership, the Chamber Mead Wetland project has received funding from The Coca-Cola Foundation, Natural England (through the Species Recovery Programme), the Environment Agency, Surrey County Council, the Rivers Trust, the Zoological Society of London, Garfield Weston Foundation and Thames Water, with in-kind support from the landowner Epsom & Ewell Borough Council.
The new wetlands are part of the wider Replenish programme in partnership with the Coca-Cola Foundation and the Rivers Trust. The aim of Replenish is to restore millions of litres of water in this and other local catchments, in turn improving biodiversity.
The South East Rivers Trust (SERT) has completed the construction of a 2,000m2 pollution filter which will bring major benefits to the Hogsmill chalk stream.
When planting takes place in the spring, the newly constructed Chamber Mead wetland will protect and improve 5km of river downstream, filtering pollutants and becoming a haven for wildlife.
The wetlands took shape during several months of construction
The project has been carried out in partnership with Epsom & Ewell Borough Council, which owns and manages the Hogsmill Local Nature Reserve, a popular greenspace which will now benefit from this new community asset.
The wetland is a crucial project for the Hogsmill, which suffers adversely from pollution such as urban road runoff, raw sewage discharges and misconnected plumbing that sends drain water directly into the river.
Water from the Green Lanes Stream has been diverted through a sediment trap and two wetlands. Filtered, cleaner water is then reconnected to the Hogsmill downstream of the famous Stepping Stones.
News about the wetland’s completion comes in the week of World Wetlands Day, on Friday 2nd February.
Dr Bella Davies, Co-CEO of SERT, said: “We are delighted that the construction phase of this important wetlands project has now been completed. It is destined to become a jewel in the crown of the Hogsmill Local Nature Reserve. The public has shown great enthusiasm for this project, and we will soon be calling on volunteers and community groups to add the plants that will really make the wetlands flourish as a magnet for wildlife. The water quality improvements that will result from the wetlands are designed to help the river become a healthier place for all, especially wildlife that thrive in a chalk stream, such as brown trout.”
Councillor John Beckett, Chair of the Environment Committee at Epsom & Ewell Borough Council, said: “The council is committed to protecting and enhancing biodiversity in our borough, as per our Biodiversity Action Plan 2020-30. This partnership project with the South East Rivers Trust will help to ensure that the Hogsmill Local Nature Reserve is a place where nature can thrive; from woodpeckers, hedgehogs and bats – to species whose numbers have dwindled such as water voles, fish and eels. We know our residents cherish this Local Nature Reserve and I hope that many can join the community planting days, which are a unique opportunity to be part of this fantastic project.”
Michele Cooper, Environment Agency Catchment Coordinator, added: “In partnership with local communities, the Environment Agency is investing millions in chalk stream restoration projects across the country to foster more sustainable abstraction, tackle pollution from agriculture and the sewage system, and restore more natural processes.
“Chalk streams are precious habitats, havens for wildlife and highly valued by local communities and visitors alike. Together with our partners, we also continue to work hard to protect and enhance wetland habitats to benefit people and nature. Their future depends on collective action and this partnership project is therefore a much needed and welcome step towards addressing the many pressures these rare watercourses face.”
The construction of the 2000m2 wetlands at Chamber Mead has been completed
SERT is now preparing a series of community planting days, to take place in the Spring. These will give residents the chance to plant the vegetation to help the wetlands counter pollutants.
Schools, community groups and residents will be given opportunities to install plants that have been specifically selected to filter pollution, trap sediments and attract a variety of wildlife. Plants selected include yellow flag iris, ragged robin, purple loosestrife and brooklime.
In time, SERT will also offer guided walks and outdoor education sessions for school children. A nature trail is planned for families to interact with the wetlands as they develop, alongside information boards which will detail the reasons why the wetlands were needed and the types of wildlife that should be attracted.
The construction was carried out with Five Rivers environmental specialists.
Supported by the Hogsmill Catchment Partnership, the project has received funding from The Coca-Cola Foundation, Natural England (through the Species Recovery Programme), the Environment Agency, Surrey County Council, the Rivers Trust, the Zoological Society of London, Garfield Weston Foundation and Thames Water, with in-kind support from the landowner Epsom & Ewell Borough Council. The new wetlands are part of the wider Replenish programme in partnership with the Coca-Cola Foundation and the Rivers Trust. The aim of Replenish is to restore millions of litres of water in this and other local catchments, in turn improving biodiversity.
The Chamber Mead wetland will become a ‘jewel in the crown’ of the Hogsmill Local Nature Reserve
At the start of October, the South East Rivers Trust appeared on Channel 5’s documentary about sewage in our rivers. The programme demonstrated the extent of the problem nationwide, quoting swimmers and environmental campaigners. Below is a snippet of our involvement in highlighting the issues – and three actions you can take.
“The soft sediment underneath – I think you can imagine what it’s made up of,” remarked Dr Chris Gardner to TV presenter Michaela Strachan during Swimming in Sewage: Britain’s Water Scandal.
Our Head of Science and Partnerships was describing what lies at the bottom of the River Hogsmill right next to a Combined Sewer Overflow (CSO), an mechanism that sends raw sewage into rivers during heavy rainfall.
Aired on October 4, the documentary highlighted the effects of sewage being regularly pumped into our rivers, up and down the country. Rivers that were once clean to swim in are now full of what we flush down the loo, causing health issues for those unaware that raw sewage is being sent into them regularly, from these CSOs.
These pipes were designed to stop sewage backing up into homes during heavy rainfall, when sewage treatment works could not cope with the amount of waste and excess rainfall coming from urbanised environments. These single pipes combine waste water from our homes and businesses and surface water. They are supposed to be in operation sparingly. Last year, 15,000 CSOs across the country spilled water into our rivers for 2.5 million hours, the programme reported.
Chris had given Michaela a tour of a clean looking section of the Hogsmill. One of only 210 chalk streams in the world, its clear water – filtered through springs – provides a superb environment for aquatic life.
But as Chris took the presenter to the confluence of where the river meets the Green Lane stream on the River Hogsmill, the colour of the water suddenly became much more murky. The cameras showed dirt and sediment on the riverbed.
Dressed in waders, the pair moved to the site of a CSO, where Chris pointed to clear signs of it sending sewage into the river very recently – most likely the night before when it had rained.
Investment needed
Michaela, recoiling at the thought of raw sewage in this rare chalk stream which should be rich in minerals, asked what could be done?
Chris replied: “We need to invest in the sewage works infrastructure. For the past few decades we haven’t had the investment to keep up with the population growth. We also have climate change and more intense rainfalls.”
Many of the sewers have been around since Victorian times, so Michaela also wanted to know if it was possible to upgrade them?
“There certainly is a technical challenge,” replied Chris, “but we put people on the moon with [what is now] the computer power of a pocket calculator 50 years ago so, surely, we can upgrade our sewage works to the standards required.”
Our Chamber Mead wetlands project, which began in late August, is very close to where the filming took place. The wetlands will help to divert water from road run-off and urbanised pollution away from the Hogsmill. It will divert the Green Lanes stream – as seen in the documentary – into a series of new wetlands and project 200 metres of this chalk stream.
But what can you do to help protect rivers from sewage and pollution?
First, you can demand action from your Water Company. The programme’s airing could not have been more timely, coming just after water companies submitted their business plans for 2025-30 to Ofwat. Our recent blog looks at these plans and urges you to sign up to your water company’s online session, where you can question them about the details. These take place before the end of November. Are their timetables for addressing this urgent problem of sewage fast enough? How will they upgrade infrastructure? What nature-based solutions in urban areas are they planning to combat water, combined with sewage, rushing into our rivers all at once during heavy rainfall?
Second, you can sign the Rivers Trust’s Nature2030 campaign, asking all political parties to make five nature pledges in their manifestos ahead of a General Election, which many expect to take place next year. This asks that the “polluter pays” and for a Natural Nature Service, to protect our environment.
Work to create a major new series of wetlands at Chamber Mead is scheduled to begin on 29th August – pushed back from 21st August – and is planned to take approximately 10 weeks.
The project, developed over several years by the South East Rivers Trust (SERT), is designed to help improve water quality along a stretch of the Hogsmill River near Ewell. The project will also help a wider range of wildlife flourish in this part of the Hogsmill Local Nature Reserve and improve the area as a place for people to enjoy.
Water quality in this section of the Hogsmill River is adversely affected by pollution from road runoff, foul sewage pipes incorrectly connected into surface water drains and discharges from the Epsom Storm Tanks.
Wetlands are a nature-based solution to improving water quality. Water that drains through them is gradually filtered by plants and captured in the soil, intercepting and treating pollution.
The shaded area shows where the Green Lanes Stream will be blocked and diverted through the wetlands
Increased plants, pollinators and other wildlife connected to the wetlands will provide an attractive addition to this popular open space, as well as providing opportunities for outdoor education.
The new wetlands will intercept water from the Green Lanes Stream, before connecting the river channel back into the Hogsmill River, downstream of the famous Stepping Stones. This will safeguard 200 metres of chalk stream from pollution, reducing the risk to health and improving the area as a community amenity.
Further downstream, the wetlands will continue to provide benefits to the Hogsmill River, which is one of about only 200 chalk streams in the world.
Supported by the Hogsmill Catchment Partnership, the project has received funding and support from The Coca-Cola Foundation, the Environment Agency, Surrey County Council, the Rivers Trust, the Zoological Society of London and Thames Water.
It is part of the wider Replenish programme in partnership with the Coca-Cola Foundation and Rivers Trust which aims to “replenish” or restore millions of litres of water in this and other local catchments, in turn improving biodiversity.
Ed Byers, Senior Project Manager at SERT, said: “We are excited to be bringing the Chamber Mead wetlands to the Hogsmill Local Nature Reserve.
“The wetlands are much needed to improve the water quality of a precious chalk stream for wildlife and for the enjoyment of the public, who have shown great support for this project.
Chamber Mead parking suspension details during construction of the wetlands
“As well as reducing pollution, the plants chosen, such as brooklime, marsh marigold and purple loosestrife, will also act as a magnet for an abundance of wildlife and further improve this much-loved local space.”
Parking restrictions will be in place at two locations along the Green Lanes during the works, to allow site access for vehicles involved in the construction phase and to ensure public safety.
The work will also require a large number of lorry movements to remove excavated material from the site.
The creation of the Chamber Mead Wetlands took another big step forward when planning permission for the scheme was granted by Epsom & Ewell Borough Council’s planning committee.
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