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.
The school summer holidays are here and its is time to proudly reflect on another fantastic year for Project Kingfisher. Come rain or shine, our dedicated Education Team have been busy connecting over 5000 school children with nature. Highlights of the year saw students helping to plant our new wetland, Chamber Meads, creating lasting memories through hands-on experience, and our Education Officer winning the Peter Spillett Award.
Educational Experiences with Project Kingfisher
Project Kingfisher offers a wealth of educational experiences, including assemblies, interactive walks, and river dipping sessions for school children and youth groups. The sessions span the Beverley Brook, Wandle, Hogsmill, and River Mole, ensuring accessibility for many schools in the South East. We offer activities and opportunities to support teaching and to help inspire pupils’ love of nature through learning.
Connecting Young People to Nature
At the heart of our sessions is the aim to connect young people to their local environment and its wildlife. Through activities like creating natural art, listening to birds, and making promises to support the river, we inspire students to appreciate and care for their surroundings. Additionally, we link our sessions to the National Curriculum therefore reinforcing classroom learning and hands-on experiences that make the natural world come alive.
Positive Feedback from Teachers and Students
We received 100% positive feedback on our sessions with one school creating a podcast about their experience which highlights the inspirational impact of Project Kingfisher. Here are some of the wonderful comments we’ve received from teachers:
“Project Kingfisher is perfect for introducing children to our rivers. The delivery and content engaged the children, and they had an absolute blast!”
“The assembly entertained and engaged children from Years 1-5 equally. It was visual, full of information, and involved children in activities throughout.”
“Our second time river dipping, and the classes loved it both times. The project is well-organised, links neatly to the curriculum, is superbly resourced, and knowledgeably run. As a teacher, this is exactly what we look for on an afternoon trip. It offers fun and exploration in the outdoors that isn’t often experienced by children these days. Great fun for all, even the accompanying parent helpers.”
“The river assembly and the interactive walk linked beautifully with pupils’ learning at school. They enjoyed being guided by an expert, which helped them think about the importance and sustainability of the river.”
“I loved listening to the different sounds of birds and nature.”
“I loved making a promise to make sure that the tributary will keep flowing and not dry up!”
Book Your Session for September
As we gear up for the new school term, we encourage you to book your sessions with Project Kingfisher. Give your students the opportunity to discover the wonders of their local rivers and develop a lasting connection with nature.
For more information about our education sessions, visit our Project Kingfisher Education Page or email us at education@southeastriverstrust.org. Schools in Crawley can also join us for special sessions at Gratton’s Park on the Gatwick Stream through our “Our River Our Water” programme.
Last week, we celebrated London Rivers Week by hosting four local events on our South London rivers, with 90 volunteers joining us to make a positive impact.
What is London Rivers Week?
London Rivers Week is an annual campaign that inspires the public to celebrate all of London’s rivers and the various projects that protect them. This year’s theme, “London is a River City,” focused on health, well-being, and cultural activities. Now in its eighth year, London Rivers Week continues to grow, uniting partners and communities to celebrate the abundance of rivers and waterways in London.
Cleaning up the Wandle
Cleaning the Wandle for London Rivers Week 2024
Volunteers from near and far joined us to clean up the River Wandle in Poulter Park. Their fantastic efforts resulted in the removal of a significant amount of rubbish, including tyres, a push bike, pots and pans, a huge sign, a few shoes, and some very gross cushions. A big thank you to Sutton Council for arranging rubbish removal and to Tooting and Mitcham Community Sports Club for letting us use their facilities!
Showcasing restoration on the Beverley Brook
We gave a tour along the Beverley Brook from Richmond Park to Wimbledon Common (and back again!) to learn about the history, ecology and river restoration work of the Beverley Brook. In 2015, we partnered with The Royal Parks to rehabilitate over 600m of the Beverley Brook through Richmond Park and improve the water quality of the river by implementing both engineered and nature-based solutions. This is one of our flagship projects and we love sharing it with the community and local partners – you can read more about it here!
Family fun at Elmbridge Meadows Community Day
Family Fun At Elmbridge Meadows Community Day
A fun-filled family day was the perfect opportunity for residents to find out how our Enriching Elmbridge Meadows project will re-naturalise 1km of the Hogsmill River. Our information stall gave more information on the river and the project, children enjoyed our craft activities and a small group got into the river in the afternoon to pull up the invasive plant, Himalayan Balsam. Some of our wonderful riverfly volunteers, who carry out monthly monitoring of river invertebrates, kindly gave their time to help collect river dipping samples and people of all ages took delight in seeing what actually lives in the river.
Bashing balsam on the Hogsmill Chalk Stream
We had an amazing turnout for a balsam bash on the Hogsmill with local volunteers joined by the Kingston Ramblers.
Balsam bashing on the Hogsmill River
Himalayan balsam is a big problem for river banks up and down the country. In addition to competition for pollinators, native plants must also compete for light, nutrients and space, leading to an overall reduction in native biodiversity. Moreover, the fact that the balsam dies back in the winter means that it leaves river banks bare and susceptible to erosion, and the dead leaves and stems can also cause blockages, which can lead to flooding.
What’s more, each plant can produce up to 800 seeds per year – and one plant can propel copious amounts of that seed a distance of up to seven metres!
London Rivers Week is organised for the River Partnerships in London (RiPL) via the London Rivers Week steering group. The principal organisations running London Rivers Week are the Environment Agency, Thames21, the South East Rivers Trust, London Wildlife Trust, ZSL, CPRE London, and the Thames Estuary Partnership. In addition to these organisations, many other groups run and contribute to events, walks, talks and seminars to demonstrate the value of rivers.
Another great year for the event, and we look forward to London Rivers Week 2025!
A fun-filled family day in Elmbridge Meadows is the centre-piece of the South East Rivers Trust’s contribution to London Rivers Week 2024.
Residents have the chance to learn about our project to improve the river at Elmbridge Meadows
Residents will have the chance to learn how our Enriching Elmbridge Meadows project, starting later this year, will improve the River Hogsmill in this local nature reserve in Berrylands, Kingston.
The community will have the chance to learn how to remove Himalayan Balsam first hand, via a “balsam bash”, alongside other activities such as guided walks and crafts.
The event takes place on Sunday 23rd June, on the first weekend of London Rivers Week (22nd to 30th June), as groups across the capital invite people to celebrate the theme of ‘London is a River City’.
Emma Broadbent, SERT’s Volunteer and Engagement Officer, said: “We are always thrilled when London Rivers Week comes around because south London’s rivers are where our work began.
“Our range of events give people the chance to learn why the Hogsmill, Beverley Brook and Wandle rivers are vital to communities and wildlife, and what they can do to help protect and enhance them.
“In particular, London Rivers Week 2024 gives the communities of Surbiton, Tolworth and Kingston the perfect opportunity to find out how our Enriching Elmbridge Meadows project will re-naturalise 1km of the River Hogsmill. Our information stall and guided walks will give more information on the river and the project, children can enjoy our craft activities and people of all ages can delight in seeing what actually lives in the river at our river dipping table.
“We will have lots of volunteering opportunities as part of this project, with a focus on managing Himalayan Balsam. This non-native invasive species destabilises river banks, spreads very easily and outgrows native plants.”
Further restoration plans for Elmbridge include adding gravel to the river to give fish and invertebrates refuge places and areas to spawn, and adding woody debris to re-wiggle a straight and narrowed river so that nature can thrive better.
A SERT volunteer tackles Himalayan Balsam
As well as the Elmbridge Meadows day focusing on the Hogsmill (10am to 3pm), SERT will also be staging three other events during the week, giving people the opportunity to understand the importance of rivers and take action to protect them.
Sign up for:
A balsam bash at Six Acre Meadows, to protect the River Hogsmill from this non-native invasive species, on Tuesday 25th June, 10am to 2pm.
A guided walk from Richmond Park to Wimbledon Common (and back!) to learn about the history, ecology and restoration work along on the Beverley Brook on Wednesday 26th June, 10am to 12.30pm.
A River Wandle cleanup at Poulter Park, Carshalton, clearing rubbish from the river to protect wildlife and help it thrive, on Thursday 27th June 10am to 2pm.
The eighth annual London Rivers Week, organised for the River Partnerships in London, features about 60 events. These range from river clean-ups to cultural experiences, emphasising the intrinsic links between people and their waterways, all designed to raise awareness of the capital’s network of rivers, how they benefit us and how we can protect them.
London Rivers Week is organised for the River Partnerships in London (RiPL) via the London Rivers Week steer group. The principal organisations running London Rivers Week are the Environment Agency, Thames21, the South East Rivers Trust, London Wildlife Trust, ZSL, CPRE London, and the Thames Estuary Partnership. In addition to these organisations, many other groups run and contribute to events, walks, talks and seminars to demonstrate the value of rivers.
We are delighted to have teamed up with GLi, the logistics warehouse company, which has produced a short film documenting Project Kingfisher, our flagship education programme which deepens the younger generation’s experience of urban waterways.
As part of the company’s dedicated social value programme, Urban Life, GLi has joined forces with Project Kingfisher to champion river sessions in Merton, close to its forthcoming Mitcham site, that offer children an immersive, hands-on experience with the river.
GLi’s Urban Life programme has supported our Project Kingfisher education programme
The film aims to share the experience of local children who, through these sessions, are encouraged to explore not only the riverbank’s visible features but also the world thriving beneath the water’s surface. Through these river dipping and outdoor learning activities, primary school pupils and youth groups get close to diverse river inhabitants, while having the opportunity to explore their local area.
Polly Penn, Head of Working with Communities at the South East Rivers Trust, said: “We are delighted that GLi has decided to support our education programme. Support by businesses such as GLi is vital in helping us to inspire children by connecting them to rivers.
“Our aim is that every primary school child should experience the fun of outdoor learning. This helps young people not only learn the importance of protecting water but also helps them develop fantastic personal skills. Studies show that children who learn outdoors develop confidence in diplomacy, negotiation and social skills which in turn will help them prepare as adults for the challenges we face from climate change. We are delighted that GLi wishes to share in our vision.”
Children learning at an outdoor Project Kingfisher session
London’s rivers, once a vital part of the city’s industrial heritage, now serve as vital sanctuaries for urban biodiversity and community well-being. Recognising their pivotal role, GLi’s Urban Life programme advocates for the preservation and revitalisation of these historic waterways. Its commitment extends to supporting initiatives that improve access for the community, enhancing water ecology and supporting canal and river heritage education – enriching the lives of those around our industrial units.
The company is pleased to support Project Kingfisher’s work in Merton, ahead of their Mitcham Park development in the area, set to begin later this year.
The South East Rivers Trust runs Project Kingfisher education sessions designed for Key Stage 1 and 2 pupils across the Beverley Brook, Hogsmill and Wandle rivers, outdoors and indoors. For details of all our sessions, along these and other river catchments, visit our education page where you will find details of how to book.
We’re calling on you to join the #VoteforRivers campaign run by the Rivers Trust in the lead-up to the General Election on Thursday 4th July.
This is your chance to use the power we have as voters to advocate for nature restoration and to take this vital opportunity to speak up for healthy rivers.
We’ve set out asks under five headings, whether you plan to seek answers from candidates who come knocking on the door, question them at local hustings or want to write to them.
You can find the candidates running in your area using The Electoral Commissionand download the letter to write to them, or have the asks handy when meeting candidates in person.
We want you to ask the new Government to:
1. Prioritise nature recovery – make nature-based solutions like trees and wetlands to improve the environment and tackle climate change as first choice, rather than relying on chemicals and concrete.
For example, we at the South East Rivers Trust have just completed Chamber Mead wetlands in Ewell, Surrey, which diverts road runoff away from the River Hogsmill. Plants being established there will also bring huge biodiversity benefits to the Hogsmill Local Nature Reserve.
We are working on restoring water voles, eels and trout via our WET Hogsmill project, we have restored a section of the River Blackwater in Hampshire and the Wandle in Morden Hall Park with woody debris and by adding gravel.
2. Improve our understanding of rivers – support better data and evidence to improve regulatory monitoring and recognise the value of citizen science alongside it.
Through our work engaging the public and encouraging them to take part in citizen science, we collect data on the health of our rivers. Examples include training volunteers to:
Discover how much misconnected plumbing is in our rivers through our Outfall Safari work
Carry out riverfly monitoring to judge the health of rivers and whether there has been pollution, by finding invertebrates
3. Support education and engagement about rivers – No one will protect what they don’t know about or understand – and what they have not experienced. So we need the Government to support education about the environment and rivers at all levels.
The South East Rivers Trust has an extensive education programme
The South East Rivers Trust has programmes supporting education of primary school children and community groups across London catchments and the River Mole.
Our events also demonstrate the value of our work through walks and talks across a wide range of topics and we take part in awareness campaigns such as London Rivers Week.
4. Make polluters pay – drive strong enforcement of those who pollute to turn the tide on the abuse of our rivers.
We have recently supported a campaign to clear Hoad’s Wood in Ashford of fly-tipping. After a petition, the Government has now issued a clean-up edict which will cost the taxpayer huge sums. Nobody has yet been traced to pay for the clean-up.
5. Manage land with water in mind – empower collaborative working that gets everyone involved in restoring our rivers.
Leaky wooden dams are a nature-based solution used by SERT on the River Beult among other places
At the South East Rivers Trust we lead several catchment partnerships across 12 river catchments. These work collaboratively with many other organisations and individuals to bring rivers back to life. They need investment and funding to do so.
Our Holistic Water for Horticulture project also works with food growers in Kent and the South East to ensure water efficiency and resilience in the process of getting food from farm to fork.
This is part of the work of our Water and Land Stewardship team, which has worked closely with farmers on the River Beult in Kent on nature-based solutions to retain water and enhance biodiversity, for the benefit of wildlife and people. We are involved in national pilots for Environmental Land Management Schemes, funded by Government, working with farms to manage land in sustainable ways.
For example, we are working with farmers and landowners and other environment NGOs on the River Darent catchment to implement a radical, large-scale approach to delivering climate benefits – starting with rivers.
Here are some questions you can ask your candidates
How will you and your party tackle all types of pollution in our rivers? Sewage is not the only issue; farming and road runoff pollution are also devastating our rivers.
Will your party boost funding for regulators and strengthen enforcement so polluters are made to pay for their pollution?
How will your party work with nature to improve river health and tackle climate change?
How will your party open up rivers and blue spaces in our towns and cities for health and wellbeing?
How will your party support farmers and businesses manage their land sustainably for water?
No matter where you live across our 12 catchments, there is a river near you. Find our river using our map, using your postcode. There a hundreds of candidates standing for constituencies from Berkshire through Hampshire, Surrey, Sussex, Kent and south London who want your vote – so press them on the hot topics!
If you are writing to your candidates, you could use or adapt the Rivers Trust’s template, by copying and pasting the information below or adding in your own asks on rivers. Don’t forget you can source candidate details via The Electoral Commission.
Dear [Candidate name],
I will be voting for rivers in the General Election on 4th July 2024 and, as a local resident and voter, need to know how you intend to stand up for our waterways.
The Rivers Trust’s State of Our Rivers Report 2024 lays bare the dire health of our waterways, which are facing devastating levels of pollution, swinging between extremes of flood and drought, and experiencing shocking drops in biodiversity:
0% of stretches of river in England are in good or high overall health.
This is not breaking news – the issues faced by our rivers have been hitting the headlines for years and causing widespread public outcry. Yet not enough is being done to restore or protect our waterways.
Healthy rivers should be a priority for the next Government. From re-wiggling rivers, restoring floodplains, and greening our urban spaces, restoring our rivers means securing community resilience, a future for wildlife, and action for climate.
This is why I am supporting The Rivers Trust’s asks for political candidates and parties:
Prioritise nature recovery – make nature-based solutions like trees and wetlands to improve the environment and tackle climate change first choice, rather than relying on chemicals and concrete.
Improve our understanding of rivers – support better data and evidence to improve regulatory monitoring and recognise the value of citizen science alongside it.
Support education about rivers – no one will understand or care about what they haven’t experienced. Outdoor learning is key to nurturing a lifelong love of rivers.
Make polluters pay – drive strong enforcement of those who pollute to turn the tide on the abuse of our rivers.
Manage land with water in mind – empower collaborative working that gets everyone involved in restoring our rivers.
Please let me know what actions you and your party intend to take to deliver the asks above and restore the health of our waterways.
I look forward to hearing from you and, if possible, please copy info@theriverstrust.org in your reply.
Hundreds of people attended Saturday’s Chamber Mead wetlands open day, many of them volunteering to start the mammoth task of adding 10,000 plants to the edges of this important pollution filter for the River Hogsmill.
The 2000m2 series of wetlands has been created to divert pollutants, coming from the Green Lanes stream, away from the globally rare chalk stream and will increase the numbers and types of wildlife across the Hogsmill Local Nature Reserve.
Egrets and ducks were already enjoying the wetlands as crowds gathered to hear Dr Bella Davies, Co-CEO of the South East Rivers Trust (SERT), explain the reasons for creating the wetlands in partnership with Epsom & Ewell Borough Council, which owns and manages the nature reserve.
The Mayor of Epsom & Ewell Rob Geleit cuts the ribbon to open the wetlands
The wetlands were then officially opened thanks to a ribbon being cut by The Worshipful Mayor of Epsom & Ewell, Councillor Rob Geleit.
In her speech, Bella explained that the project had been conceived more than a decade ago by the Hogsmill Catchment Partnership. This group of organisations and individuals wanted to address the issues of poor water quality in the Hogsmill. It is one of only about 220 chalk streams worldwide. Clear, cool waters in such streams should provide special conditions for creatures such as trout, eel and water voles to thrive.
“Many years ago we identified the Green Lanes stream was bringing poor water quality in. We discovered there was a whole load of urban runoff coming from Epsom,” Bella said.
“Surface water drains were sending [polluted] water straight from roads into the river – and that included lots of nasty things like hydrocarbons, heavy metals from tyres and catalytic converters and microplastics. In addition, there are misconnected pipes for example where toilets are plumbed in wrongly. People pour items down drains, there are pesticides from gardens – and all that is really toxic.
Volunteers start to plant up Chamber Mead wetlands
“There is another really big impact which came from the sewer storm tank overflows. Further up the Green Lanes stream there are two sewers that come together … and to stop them from backing up into your homes, there is a storm tank system where water flows up and theoretically goes back into the sewer. But in exceptional circumstances it overspills into the Green Lanes stream.
“Trying to fix that is really difficult,” Bella continued. “We worked with Thames Water to make the performance of the storm tanks as best as they could and they have reduced the number of times they spill massively.
“Another option is to clean the water before it goes into the river – and that’s what the wetlands are here to do.”
The public had the chance to added plants to the wetlands
About 90% of wetlands have been lost in the past 100 years, Bella added, and this nature-based solution would bring lots of other benefits. “It might look a bit raw, but it is a great time to see it [before plants are added].”
Trapping the silt in the initial pond was “really important,” she explained, because otherwise that silt smothers the river gravels in the water, restricting wildlife’s ability to thrive.
Contaminants coming from Green Lanes are also cleaned through the plants, before the cleaned water is sent back into the Hogsmill downstream of the popular stepping stones.
Multiple benefits of the wetlands include it becoming an attraction for wildlife such as damselflies and dragonflies, Bella added. It is also “really important” for local climate regulation. Those living near water experience lower temperatures which will be “really important” in hot summers in particular.
A special cake was created by Heidi’s cakes in Carshalton to mark the occasion
“There is also increasing evidence of the importance of nature for health and well being – and that’s amplified when we are near water. It helps decrease stress and also is a really great educational resource,” she added, referencing a new nature trail that has been put up around the site.
Delivering multiple benefits meant SERT, which leads the catchment partnership, has been able to appeal to a wide range of different funders. The development of the wetlands 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.
In total, about 300 visitors through the day had the chance to start the task of putting in vegetation around the wetlands and go on guided walks to hear more about the project.
Family friendly activities such as craft and the chance to explore what lives in the water through riverfly demonstrations were also available. Visitors also enjoyed a fabulous cake, baked to look like a wetland flush with wildlife, created by Heidi’s cakes in Carshalton.
The South East Rivers Trust (SERT) is inviting local residents to come and celebrate the newly-created Chamber Mead wetlands with a day of family fun, activities and guided tours.
The celebration day on Saturday 20th April will give nature lovers the chance to add plants to this critical pollution buster for the River Hogsmill, a precious chalk stream.
Families will also have the chance to learn about the health of the river by taking part in riverfly demonstrations, a scavenger hunt and nature craft activities. Guided tours of the wetlands will also be part of the day, which runs from 11am to 3pm.
The open day begins a fortnight of planting opportunities for schools and community groups. All the plants have been specially selected to absorb pollutants and attract pollinators and an increased range of wildlife across the Hogsmill Local Nature Reserve.
An aerial view of Chamber Mead wetlands
The wetlands in Ewell now divert urban pollutants from the Green Lanes Stream away from the Hogsmill, one of only 200 chalk streams in the world. Once filtered water is fed back into the river just downstream of the famous Stepping Stones, another 5km of waterway is protected as it flows into south London all the way to the Thames.
Dr Bella Davies, Co-CEO of SERT, said: “We’re thrilled to be giving the community the chance to learn all about Chamber Mead wetlands and crucially give people the chance to complete the project. The public have been very supportive of the wetlands from the start and adding plants is a wonderful opportunity to attract new wildlife not only to the water but the wider nature reserve. This will fulfill the potential of the wetlands to become another jewel in the crown of the reserve and make it an even bigger asset for the community. We’re excited to see the results in years to come on the Hogsmill, which should be a haven for brown trout, water voles and native crayfish, among other species which need our help in recovering their numbers.”
Councillor John Beckett, Chair of the Environment Committee at Epsom & Ewell Borough Council, said: “We are overjoyed to be able to join SERT on the Chamber Mead Wetlands Open Day, to celebrate the fantastic work that has been done here to boost biodiversity and reduce pollution in the Hogsmill River. I hope that residents will join us to help complete the project, which will ensure the Hogsmill River Local Nature Reserve is a place where wildlife and nature can thrive, and one that we can enjoy for many years to come.”
An example of wetlands planting
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 public can meet the South East Rivers Trust and other partners for the activities at Green Lanes, Ewell, Surrey KT19 9SZ.
Speeches to officially open the wetlands will take place from 11.30am to noon. These will be by Jackie King, Chief Executive of Epsom & Ewell Borough Council, Dr Bella Davies, Co-CEO of the South East Rivers Trust, and The Worshipful Mayor of Epsom & Ewell, Councillor Rob Geleit, who will also cut the ribbon to officially open the wetlands.
Dr Lewis Campbell, one of our Catchment Managers, reports how we have introduced a modern method of assessing what’s in rivers to our armoury.
Traditionally, a variety of methods have been used to evaluate biodiversity and to understand whether or not a specific species is in a particular place in the countryside. When it comes to fish, for example, these survey methods might involve the use of nets or electrofishing equipment. For mammals, methods can involve field surveys looking for footprints, droppings, burrows and dens, or installing hidden cameras that are automatically triggered with movement. When studying birds, ecologists might spend time in the field searching for visual signs or identifying different species by their calls.
Our work seeks to help trout recolonise the Hogsmill. Picture via Canva
For smaller creatures, such as amphibians, reptiles and even invertebrates, various types of traps can be deployed so that the animals can be collected and counted before being released again.
One thing that this diverse set of methods all have in common is that they require a large amount of time to be spent on site. More recently, conservationists have begun to use environmental DNA, or eDNA for short, as a tool to understand species distribution. As animals go about their daily lives, they are continually shedding cells into their environment. These cells might come from their hair, skin, saliva, or even their waste, but they all contain the genetic material (DNA) belonging to that animal within their nucleus. This is environmental DNA.
Rivers could be compared to a soup containing cells and DNA from all of the organisms that live in or near by the water.
Simply by collecting a water sample, we can gain a snapshot of all the animals that were in the local vicinity at the time. We pass river water through an extremely fine grade filter, then generate and analyse the genetic sequences that the sample contains. A single water filter sample can reveal the presence of hundreds of different species from right across the animal kingdom.
eDNA is quite a modern technique. The first example to detect species in a freshwater environment was in 2008, when French researchers used the technology to detect invasive American bullfrog. Since then, technology and its potential applications have improved and expanded rapidly.
Preparing to take a sample to find out the DNA of the Hogsmill
The analysis portion of this work requires numerous pieces of cutting edge technology and very powerful computers, but collecting a water filter sample is very straightforward and quick. This means that it is possible to comprehensively survey the biodiversity at a location much more efficiently than is possible using many traditional methods.
The only major drawback of eDNA surveys is that they can currently only provide information on whether a species was or was not in a given location but not how many were there. For example, using eDNA you could say “I did detect salmon in my river” but not “there were 50 salmon in my river”.
This means that it is a particularly powerful first pass tool for determining presence or absence of a species, which would then by followed up with more targeted traditional surveys. Therefore, eDNA will never replace the valuable work of professional ecologists, but is certainly a very important emerging tool in the conservationist’s arsenal.
At the South East Rivers Trust we are beginning to use eDNA to understand the biodiversity in our rivers before, during, and after our restoration work. This is critical to developing an understanding of whether or not the projects that we undertake are having the desired positive outcomes for the wildlife that call our rivers home.
An important example of this type of baselining is our WET Hogsmill. This is funded by Natural England and aims to kick start the recovery of several species of concern in the River Hogsmill in South West London.
These species – water vole, European eel, and brown and sea trout – are imperiled across our river network, but all of them historically called the Hogsmill home.
The presence of water voles was detected in the Hogsmill by eDNA. Picture via Canva
Our WET Hogsmill project will enhance the river to make it more accessible and more useable for these species, aiding their recolonisation of the river. Environmental DNA is a great tool for us to demonstrate where these species are living along the river. The aim is that over time this will document increases in the numbers of places where specific species are found along the river.
So far we have undertaken a baseline eDNA survey at several points along the Hogsmill, from near its source, to its confluence with the Thames at Kingston. We collected water samples that were used to detect a wide variety of vertebrate species. We found mammals including red fox, grey squirrels, and wood mice. We detected fish including barbel, chubb, stickleback, and many others. We also found birds including the majestic kingfisher, grey heron, magpie, moorhen, coots, and parakeets.
Importantly, we also detected the presence of eel, water vole and brown trout at locations on the Hogsmill, so we know those species are present and we hope that our work will help them to become better established on the river.
The initial survey’s results can be found on our Storymap and we will continue to monitor the river with annual eDNA surveys – so watch this space!
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.
Pollution in the Hogsmill River, by Toby Hull of the South East Rivers Trust
Brace yourselves: 0% of England’s rivers are in good overall health. A truly shocking fact for a habitat that’s so vital to all of us.
This and other alarming statistics come from the Rivers Trust’s 2024 State Of Our Rivers Report, which has been launched today (Monday 26th February).
Combining data, insightful maps, and illuminating case studies, the report dives into the data and evidence, offering us an insight into just how our rivers in the UK and Ireland are doing.
The data is clear:
No single stretch of river in England is in good overall health
Just 15% of English river stretches reach good ecological health standards
Toxic chemicals that remain in our ecosystems for decades pollute every stretch of English rivers
Healthy rivers can be a powerful ally in mitigating the effects of climate change, being able to protect communities from flood and drought, the report emphasises. They support a wealth of biodiversity. They also benefit our physical and mental well-being and are a fantastic way for us to reconnect with nature.
However, these vital ecosystems are plagued by sewage, chemical, nutrient and plastic pollution. They have been heavily modified, so they don’t function as naturally as they should.
All this means that our aquatic wildlife, from plants to fish, is having to work harder to survive – and that rivers can be unpleasant places to visit or to use for recreation.
So, what can you do? Here’s five actions you can take
1 Write to your MP to demand meaningful action
Demand better for your river
If you are shocked by the state of our rivers, write to your MP to demand change.
Tell them that restoring rivers is climate action, supports wildlife and protects communities.
The report allows you to search for your local stretch of river and use its stats and maps on sewage, barriers in rivers and chemicals to arm yourself with facts before contacting your MP.
You can contact your MP via the Rivers Trust’s portal – and add your own words to the template.
Ask your elected representative what they are doing about river health. We want you to demand better Government action for our rivers, through better water quality monitoring, investment in infrastructure for sewage treatment and better funding for Nature-based Solutions.
To help you when you write, we have compiled a State Of Our Rivers Catchment Crib Sheet with a basic comparison of Water Framework Directive ratings for our catchments between 2019 and 2022.
We would also encourage you to speak up for some of our recent work (below) and show how it is making a real difference to rivers.
For example:
Volunteers plant up berms at Morden Hall Park in September 2023
Nature-based solutions such as leaky woody dams are holding water longer in the landscape of the Beult area of the River Medway. This increases biodiversity and helps nature thrive, as well as slows water flow into the main river, where it is abstracted for human use. As those who went on our Nature-based Safari concluded: We need to make more of this happen on a wider scale.
Deflectors and planted berms extending parts of the bank have re-wiggled a straight section of the River Wandle in Morden Hall Park (pictured). This works wonders for wildlife, varying the flow of the water and giving fish and invertebrates places of refuge and areas to breed.
New wetlands constructed at Chamber Mead have brought fresh hope to the Hogsmill. They divert pollution which will help protect 5km of precious chalk stream.
Our Holistic Water for Horticulture project works with growers towards a 2030 target that 50% of the UK’s fresh food is sourced from areas with sustainable water management. The south east is an area already classed as water-stressed and this is an issue that affects our food security.
We’re also working to put rivers at the heart of landowner thinking as part of the Darent Landscape Recovery Project, a Government-funded pilot.
2 Shout out for your local river on social media
Join the fight for healthy rivers
What’s your local stretch of river? How do you use it and how does it affect your mood? Perhaps you visit it for pleasure with your dog on a daily walk, or use it for recreation such as rowing, canoeing or swimming.
However you care about your local river and interact with it, we want you to tell us online. Once you have found out about the condition of your local river via the State of Our Rivers report, make a noise about it!
Report what you see – for good or bad – whether that’s young fish thriving and wildlife flourishing, or plastic pollution and sewage outfall spills.
Use the hashtag #StateofOurRivers and find us on X (formerly Twitter), Facebook and Instagram. Why not tag the elected representative you have emailed, too? You can also tag @TheRiversTrust on all channels.
3 Sign up to be an Everyday River Hero
Whether you are a seasoned, long-term river user or you’ve been caught up in the increasing wave of publicity around sewage and other river issues, we want you to become an Everyday River Hero.
It might be hard to believe given our wet winter, but the south east of England actually receives less annual rainfall than the south of France. We face a real threat of not being able to meet supply by 2050, because of a growing population and climate change.
Launched in January, our 10-week email programme will tell you why rivers are essential for our daily lives and how to care for and protect wildlife, when you are exploring the great outdoors or at home. How – and how much – water you use in your bathroom and kitchen, as well as your garden can be as vital for rivers and the wildlife that thrives in them as the flea treatments you use on your dogs.
We always get a huge thrill when we can involve volunteers directly in work to help rivers thrive. There is nothing like enabling communities to take action for the stretch of water they love.
Help install gravel on the River Blackwater in Aldershot. Join us to improve this stretch of the River Loddon for fish and invertebrates on any of four days, from March 12th to 15th.
Sign up for Outfall Safari training on the Beverley Brook, on 20th. Join us and the Zoological Society of London to learn to spot and report misconnected plumbing that is polluting rivers. The results will help trace appliances such as washing machines that have been connected to the wrong pipes when they were installed.
To book, visit our events page – and bookmark it for subsequent volunteering opportunities during 2024.
5 Book our education sessions for your school or youth group
A school education session
Educating our youngest citizens is a core part of our work on the Beverley Brook, Hogsmill and Wandle rivers, where we hold sessions for Key Stage 1 and 2, in schools and along rivers. Our sessions are available for youth groups, too, so inspire them to cherish their local waterway by booking a session.
We also run school sessions on the River Mole, under the Our River Our Water programme.
If you are a parent or teacher, read our education page for full details and encourage your school community to get in touch!
As one teacher said about our curriculum linked sessions: “They fit exactly with what we have been learning and the children enjoyed all the activities.”
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
Shoppers at selected Tesco stores in Horley and Dorking can vote to support the South East Rivers Trust’s (SERT) programme to connect local children with the River Mole and its wildlife.
SERT’s school sessions bring children to their local river to spend time in nature and learn about the local wildlife – all while meeting the school’s needs for the curriculum.
Studies show that children who are connected to nature are happier, healthier and more motivated to learn – and feedback on our sessions shows the power of outdoor education.
One teacher said: “The session was a fantastic way to introduce the children to our rivers topic, the delivery and the content was engaging and the children had an absolute blast!”
A pupil added: “I loved making a promise to make sure that the river will keep flowing and not dry up!”
Polly Penn, Head of Working with Communities at the South East Rivers Trust, said: “We are delighted to have been chosen as a Tesco Stronger Starts community project because we know from our education sessions that children love the chance to visit the river. They are always inspired by being able to see for themselves the creatures they have learned about in the classroom.
“Our aim is that this and our lessons about how to use water wisely in their daily lives will instil lifelong habits – and might even inspire some of them to become scientists in the future. We hope shoppers will take this opportunity to support our work.”
Customer votes will decide how three chosen charities will receive awards of £500, £1,000 or £1,500.
The three stores where customers can vote for SERT, between mid-January and the end of March 2024, are:
Tesco Gatwick Extra, Reigate Road, Horley RH6 0AT
Tesco Express, Brighton Road, Horley RH6 7HL
Tesco Express, Reigate Road, Dorking RH4 1QB
Tesco’s Stronger Starts – previously known as Tesco Community Grants – has already provided more than £110 million to 60,000 projects across Britain.
This £5m Stronger Starts grant programme, delivered in partnership with Groundwork UK, helps schools and children’s groups provide nutritious food and healthy activities that support young people’s physical health and mental wellbeing, such as breakfast clubs or snacks, and sports equipment for after school clubs.
Claire de Silva, Tesco UK Head of Communities and Local Media, said: “Helping schools and children’s groups access the food and resources they need is vitally important in getting children a stronger start in life. Children with enough food have more energy, better concentration, and ultimately achieve more too.”
Graham Duxbury, Groundwork’s UK Chief Executive, said: “As a community charity, we have seen first-hand how schools and other groups supporting young people have been playing a much bigger role in ensuring children are getting a healthy start to the day and getting access to spaces and services to support physical activity and mental health. Family budgets are tight and school budgets are tight, but it’s so important that children stay fed, fit and focused, so we’re delighted to be able to prioritise these activities alongside Tesco with the Stronger Starts programme.”
Funding is available to community groups and charities looking to fund local projects that bring benefits to communities, particularly those helping to provide food and giving children the support they need for a good start in life.
For full details of SERT’s education opportunities for schools and youth groups and to book, visit our education page.
A new online tool has been launched this week to help tackle road runoff pollution in London’s rivers by highlighting the best places to install nature-based solutions such as wetlands.
The development of the first-of-its-kind tool by Thames21 builds on years of research by the environmental charity and its partners Middlesex University and the South East Rivers Trust, which contributed with mapping, scoping and reporting.
Pollution from our roads adds to a number of problems for our rivers coming from sewer overflows, litter and misconnected drains. However it is often the Cinderella of pollution topics, because it receives far less public attention than sewage or agricultural causes.
Research from the Rivers Trust shows that the UK’s 1,600 rivers are affected by a cocktail of chemicals that are speeding up aquatic nature-loss, affecting insects, birds and mammals.
Road runoff goes straight to rivers
Road runoff can contain residue from oil spills, as well as tyre and brake wear from vehicles. These build up during dry weather and are then washed into rivers and streams when it rains.
The new tool will help decision makers prioritise the right water quality improvements:
in greenspaces that lie between the road and the river
at road locations in Outer London where surface water drains to the rivers; and
on London’s main strategic road network (includes Transport for London’s roads and some sections of National Highways’ and local authority roads)
Thames21 started its initial road runoff project identifying key polluting roads in 2019, with funding from the Mayor of London, Transport for London, and the Environment Agency. The British Geological Survey built the online decision support tool ‘Road Pollution Solutions’ and provided some additional support through the UKRI NERC-funded CAMELLIA project.
The South East Rivers Trust contributed research on sites in South London, including Surbiton, using its GIS mapping technology and catchment-based approach, identifying places where solutions such as wetlands could be built to counter the pollutants. By providing a natural barrier and filter using nature-based solutions, some of this road runoff pollution can be captured and prevented from entering rivers in the first place.
Users of the tool can search different boroughs, pinpoint particular areas and see just how polluting they are. This will help to prioritise where solutions could be put in place as mitigation. The tool shows the location of rivers, sewage outfalls and areas that drain into waterways.
An example of how the road runoff solutions user guide works
Modelling has shown that 2,415 road sections covering a total of 451.43km of London’s roads assessed pose a high risk of causing road runoff and are therefore a priority. Roads where heavy goods vehicles regularly apply their brakes are often the worst affected.
Community groups can also easily see pollution hotspots and help to suggest solutions by working for example with the authorities or through catchment partnerships.
The tool – which extends to all outer London boroughs – allows uses to access data by boroughs or river catchment and includes the Wandle, Beverley Brook, Hogsmill, Upper Darent, Lower Cray and Upper Cray.
Working in partnership, authorities responsible for these roads could intervene by providing nature-based solutions in these areas to help make runoff cleaner, and improve water quality in local rivers and watercourses.
Find out how the tool works by reading the user guide.
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.
The South East Rivers Trust (SERT) has been awarded £393,000 as part of Natural England’s Species Recovery Programme, which aims to support targeted action to recover the UK’s most endangered species.
On 14th September, 2023, Natural England chose SERT to host the scheme’s launch at the Hogsmill Stepping Stones in Ewell, Surrey, where the fortunes of water voles, eels and trout will be boosted by the project.
A total of 63 projects across the country have been awarded a share of £14.5 million by Natural England to help recover 150 species nationwide. Following a competitive application round, the money will be used by environmental charities, wildlife organisations, local authorities and charities to deliver the Nature Recovery Network.
Citizen Zoo demonstrate a water vole realise box at the launch of the Natural Species Recovery Programme
The funding supports propagation, captive rearing, translocations, research and solution-trialling to find the best approaches to enable endangered wildlife to survive and flourish.
Some of the UK’s most iconic river wildlife has been in severe decline for decades, but now thanks to a generous grant awarded to SERT by Natural England, outcomes for rare and endangered wildlife and their habitat are about to improve on the Hogsmill river in South West London.
The WET Hogsmill project led by the South East Rivers Trust, will improve the habitat of the Hogsmill river, a chalk stream in South West London. There are only around 220 chalk streams worldwide meaning that this is an exceedingly rare and special habitat. The project will reintroduce Water Voles onto the river and create new habitats for both European Eel and Brown/Sea Trout. The project will run until Spring 2025.
Water quality testing on the Hogsmill at the Natural Species recovery programme launch
Co-CEO of SERT, Dr Bella Davies said “We are thrilled to have been successful in our application to Natural England’s Species Recovery Grant to support the recovery of water voles, eels and native wild trout which have become near extinct on the Hogsmill river in South West London. The Hogsmill is a rare urban chalk stream meaning that it’s important for nature and an important resource for people too.
“Our project will restore river habitat and create backwaters where fish can take refuge from pollution by creating wetlands to improve water quality which will help reintroduce Water Voles which were once prevalent on the river. We are excited to see this much needed work begin on the ground to bring Water Vole, European Eel and Brown/Sea Trout back to the Hogsmill.”
The Hogsmill river is the first tributary of the non-tidal river Thames and a chalk stream making it a UK Biodiversity Action Plan Priority habitat. Despite its rarity and importance, the Hogsmill has suffered a wide range of pressures leading to decline and loss of habitats and species over the last century and beyond.
Water Vole numbers have declined sharply since the end of the 20th Century making them currently the UK’s fastest declining mammal with a 97% decrease in population. Once ubiquitous and found in their millions, they are now considered to be on the brink of extinction. Water Voles were once prolific on the Hogsmill but became locally extinct in 2017.
Partnering with Citizen Zoo, a conservation charity, SERT will release 150 Water Voles across two sites on the Hogsmill, supplementing 101 Water Voles previously released by Citizen Zoo in 2022. This will help to increase the genetic diversity of the population.
Water voles will be restored to the river Hogsmill as part of our WET Hogs project
European Eel are also critically endangered with levels declining by 90-98% from historic figures. Eels migrate up rivers during their life span and recent surveys on the upper Hogsmill recorded just one eel in 2016 and three in 2022. The WET Hogsmill project will support the creation of a large wetland and backwater while also creating a more complex instream habitat which is favoured by European Eel.
Trout have been extinct on the Hogsmill since the 1900s, owing to 19 predominantly obsolete weirs barring their passage, and preventing them from reaching critical spawning grounds in the river’s headwaters. Over the past decade SERT has made 18 of these weirs passable for fish and other species by either removing them or installing technical fish passes or easements. In 2024 the final remaining weir will be made passable for multiple fish species including Brown/Sea Trout and European Eel. By spring 2025 these fish will once again be able to access and migrate throughout the whole river for the first time in over 200 years.
SERT will provide a wide range of complementary community education and engagement activities for members of the public, schools and local businesses. Planned activities include installation of an interactive nature trail, indoor and outdoor education sessions, and community talks to help local people and businesses understand how they can help protect rivers and wildlife.
There will also be several opportunities to volunteer. Those interested to learn more about the project and volunteering activities can sign up to our newsletter or bookmark our events calendar for more information.
Watch our Co-CEO Dr Bella Davies explain how the project will help species in the Hogsmill.
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.
River lovers are being urged to sign an open letter calling on all political parties to adopt a five-point plan for wildlife in their manifestos for the next General Election, likely to take place in 2024.
The Rivers Trust movement has joined an 80-strong coalition of partners to support the Nature 2030 Campaign. It is led by the Wildlife and Countryside Link and supported by celebrities including television personalities Steve Backshall and Chris Packham.
Research shows that the UK has become one of the most nature-depleted countries in the world, with more than one in seven native wildlife species facing extinction.
The campaign outlines that in 2022 sewage was discharged for more than 2.4 million hours across England, Scotland and Wales, accounting for more than 389,000 sewage spills. Commitments were set in 2021 to protect 30% of land and sea for nature by 2030, but there’s a long way to go to meet these targets. With only seven years to go, just 3% of land and 4% of sea have this protection. We need stronger environmental leadership and the Nature 2030 campaign demands it.
Thousands of people have already signed the letter, which was launched at Westminster in July.
As one of the largest regional rivers trusts, the South East Rivers Trust (SERT) is urging supporters to back the campaign, which has five key asks for political parties:
Double the wildlife-friendly farming budget to £6bn for ambitious farm improvements and large-scale nature restoration
Make polluters pay for nature restoration by requiring big businesses to deliver environmental improvement plans and funding to counter damage
Create green jobs on a large scale, including setting up a National Nature Service delivering wide-scale habitat restoration
Increase protection and funding for wildlife sites by creating a Public Nature Estate to fulfil the promise to protect 30% of the land and sea for nature by 2030
Set up a new law guaranteeing a right to a healthy environment, establishing a human right to clean air and water plus access to nature, plus building nature into decision making
Hester Liakos, co-CEO of SERT, said: “Rivers are at the heart of the battle to restore nature. Our work with local communities, farmers and landowners demonstrates the positive difference that nature based solutions and natural flood management can make in improving the health and biodiversity of rivers. But to make this difference on the scale that nature truly needs requires more funding and greater commitment and leadership from Government – so we’re asking our supporters to sign this open letter to demand action from all political leaders.”
Tessa Wardley, Director of Communications and Advocacy at the Rivers Trust, said: “The public are rightfully outraged by the state of our rivers and we need political parties to make firm commitments towards their recovery, which are then backed up by action. Delivering the Nature 2030 policies would significantly improve the health of our rivers, which are absolutely core to tackling the biodiversity, climate and wellbeing crises we face as a nation and planet.”
Have you ever looked outside a train window and wondered what it is you are passing, or thought about the history of the towns and the landscape around you?
Learning about the subjects that feature along your journey is exactly what you can now do on a rail journey between London Waterloo and Southampton, thanks to an App called Window Seater, launched today.
Tales of how the River Mole might have got its name, the lifecycle of the endangered European eel and what makes London’s chalk streams globally special now feature on the Window Seater app, which invited the South East Rivers Trust (SERT) to talk about rivers that passengers will pass.
Window Seater interviewed Polly Penn, SERT’s Head of our Working with Communities, to gather insight for an audio story on London’s chalk rivers.
Fascinating histories of art, culture – and rivers
Polly Penn’s audio on Window Seater captures the essence of river life outside the train window. Picture by Adam Borkowski Pexels
The Wandle, Hogsmill and Mole rivers criss-cross under the railway and feature among 11 stories that listeners can enjoy between Waterloo and Southampton.
Passengers who have downloaded Window Seater are notified as they pass points of interest on their journey, from art, culture and community to history and geography.
You can hear about links to author Jane Austen and fictional spy James Bond, plus Woking’s alien invasion and Britain’s first ever car journey, or pioneering women in motorsport, alongside Polly inspiring you to explore rivers and pathways along them.
The concept for Window Seater was born by Pete Silvester, who – living in Paris at the time – began talking to an old man, a regular on one particular route. This companion started telling him about all the places and histories they were passing.
How fascinating would it be to act as a guide along rail routes around the world, Pete thought?
Meeting like-minded, story-loving travellers Marcus Allender and Richard Edwards in Myanmar (Burma) in south east Asia in 2016, the trio went on to develop Pete’s fledgling concept of Window Seater.
Now, it has been taken on board by South Western Railway.
Inspiring listeners about eels and river walks
Polly gives a commentary about the River Wandle, The River Mole and the Hogsmill River, which all feature along the route.
Eel monitoring by the South East Rivers Trust happens along the route. Picture by SERT
She explains that where the train passes the Mole near Hersham, this is close to where SERT has a monitoring station for the European Eel as part of a project to help protect this critically endangered species.
Polly further explains the surprising lifecycle of this fish and how her perceptions of eels shaped her views before she moved from the countryside to London.
Her commentary outlines the ability to reconnect with nature via rivers, waterways being spaces where you can unwind and relax, telling listeners that they can walk right along the Wandle or Hogsmill and mentions points where the river intersects with the rail network.
A spokesman for Window Seater said: “At first glance from the train window, south west London suburbia doesn’t shout intrigue – but when we looked a bit harder and saw the little rivers that criss-cross under the railway we knew there had to be a story there.
“It was a delight to collaborate with the South East Rivers Trust and to get Polly’s personal insight into this fascinating part of London’s geography and ecology.”
So next time you are on a train from Waterloo towards Southampton, why not download the free Window Seater App from Apple or Android stores and listen to this tale of our rivers as your train passes through the rolling countryside?
The South East Rivers Trust has launched a Chalk Streams Review, to ensure that all rivers and streams which qualify across our catchments are identified and mapped. Dr Chris Gardner, our Head of Science and Partnerships, sets out the plan and how the public can help.
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