Tag Archives: Environment Agency

Goat Bridge Weir and Level Testing

There is a water level test taking place on the Wandle at Goat Road and we wanted you to be aware.

Plans for the Millfields Redrow development include alterations to Goat Bridge Weir which will improve the habitat and fish passage on the Wandle.

Over the next month, the Environment Agency will be investigating the impact that current river levels have on Spencer Road Wetlands. This will help inform the future plans for Goat Bridge Weir.

The weir will be lowered from today (8th October) and it will be raised again on the 22nd October 2018. During this time, you will see gradual changes to the water levels in this stretch.

Please read the full statement from the Environment Agency here:

EA Goat Bridge Weir Statement

Giving eels a helping hand on the Wandle

1 Reply

In 2017, we delivered the Wandle Eel Project in partnership with the Living Wandle Landscape Partnership, the Heritage Lottery Fund, Environment Agency, Zoological Society London (ZSL), National Trust, and Wandsworth Borough Council.

Why?

European eels (Anguilla anguilla) once thrived in London’s rivers but the number of young joining the adult populations have dropped by over 95% since the 1980s and the species has been classified as ‘Critically Endangered’ by the IUCN Red List of Threatened Species since 2008.

One of the major threats to eels in freshwater are barriers to upstream migration such as weirs and sluice gates that reduce the amount of habitat available for eels to grow and mature.

What’s been going on?

This project aimed to improve eel passage along the Wandle by installing eel passes at six locations where structures were a complete or partial barrier to migration. All installations were completed by Wandle Trust staff and assisted by local volunteers.

1. In June 2017, the existing eel pass at Morden Hall Park was repaired, extended and fitted with a monitoring trap. This site was then used by ZSL to train local volunteers, and National Trust staff to monitor elver migration along the Wandle.

2. The Topps Tiles tiles site in Earlsfield was delivered in December 2017 (in the snow), which included a row of lift out eel tiles with upstream deflector, and a section of low profile bed tiles on an adjacent channel. This site was testing the improved steel brackets which were fabricated by a local contractor/volunteer. These installations were designed as ‘easements’ to allow eels to navigate the fast flowing sections of the heavily modified concrete channels. Two old, defunct eel passes were disassembled and removed from site.

3. The Trewint Street easement was installed in December 2017, and consisted of a 30 m section of the new ‘low profile’ bed tiles that were commissioned for this project, with a short section of flexible bristles to navigate over a 300 mm wooden baulk at the upstream end. This has provided an additional route up the left hand channel which offers a less turbulent route than the fish pass in the right hand channel.

4. The eel pass at EDF was installed during Dec 2017/Jan 2018 with a 15 m section of ‘low profile’ bed tiles. As some high tides overtop the weir, these works were designed to increase the range of time/tides that this structure would be passable to elvers.

5. Improvements to an existing eel pass upstream of Ravensbury Park were installed in March 2018. An extension piece was added at the upstream end to prevent debris blockages. At the downstream end, a deflector plate was added to reduce turbulence, and four standard bed tiles were installed to direct eels towards the pass entrance.

6. This gravity fed eel pass was installed on a small side channel near Poulter Park in March 2018. This was a cheaper and more secure alternative to a pass that had previously been stolen.

We would like to give a huge thanks to all our volunteers who helped install these passes and those who are continuing to monitor eel numbers during the current season!

Joint Press Release: Brown Trout in River Wandle Hit by Pump Failures

Leave a reply

After the Carshalton Arm of the Wandle suffered low flows for another year (pictured above), we joined Tom Brake, the Environment Agency, SES Water and local Councillors, Jill Whitehead and Chris Williams, on the banks of the Wandle to discuss how we can better safeguard this precious south London chalkstream in the future.

Read the full joint Press Release below

With the River Wandle’s brown trout population hit-for-six after SES Water’s pumps failed, leaving trout eggs exposed to the air, Tom Brake convened a top-level meeting with representatives from SES Water, the Environment Agency, and the South East Rivers Trust, as well as Councillors Jill Whitehead and Chris Williams.

During the walkabout along the river bank to see the work undertaken by volunteers, SES Water agreed to put in place plans to stop future pump failures and to safeguard the River Wandle’s brown trout. SES Water and EA representatives also agreed to work with the South East Rivers Trust to ensure that the Wandle’s Carshalton arm is returned to its “Good Ecological Potential” status.

Tom Brake MP said:

“We have a collective responsibility to ensure that the river is restored to its nationally significant flagship standing.

“I want to thank the Wandle and South East Rivers Trust and all of its volunteers for being so committed to the health of the river. I am pleased to see that SES Water and the Environment Agency are working together with the Trust to ensure that the brown trout thrives and appropriate water levels are maintained.”

Bella Davies, Director of the Wandle Trust and South East Rivers Trust said:

“We are pleased that SES Water is committed to ensuring the River Wandle in Carshalton keeps flowing. The Wandle Trust has been working with the local community for many years to restore the Wandle, making it more resilient to drought and the pressures of its urban surroundings, but it’s all for nothing if there’s no water in the river.

“Water consumption in SES Water’s area is one of the highest per person in the country, and we can all do our bit to save water so that a little bit more can flow down the Wandle. In the meantime, the Trust will continue to work with SES Water and local people to help restore the local fish populations which have suffered as a result of these incidents at the pumping station”.

SES Water Managing Director Anthony Ferrar said:

“As a local Company we take our environmental responsibilities extremely seriously so we welcomed the opportunity to discuss the River Wandle and reiterate our commitment to balancing the impact of our essential activities. Over the last two years we have focussed on improving the resilience of the pumping station and are currently putting more contingency measures in place. We have also again offered for our staff to contribute their time through our ‘Give a Day’ scheme which helps strengthen our relationships with local organisations. As part of the National Environment Programme (NEP), we will continue to work with the Environment Agency, Thames Water and the South East Rivers Trust to assess options to further improve the ecological status of the River Wandle.”

For the past three years, the Carshalton arm of the Wandle River has experienced a significant drop in water levels due to malfunctions in the recirculation system monitored by SES Water. With conditions worsening, Carshalton residents have expressed extreme concern over the status of the river, a focal point of the town.

In order to maintain the vibrant ecology of the river, the South East Rivers Trust assumed responsibility in 2015 for restoring adequate water flow, water temperature, and the brown trout population to the Carshalton arm. In 2016, their rehabilitation of the River Wandle’s Carshalton arm won the Urban Category of the 2016 UK River Prize. However, due to continuous problems with the recirculation system, the improvements made by the South East Rivers Trust have regressed, leaving the river in a poorer ecological state.

For more information on the award-winning restoration of the Wandle River, visit https://www.southeastriverstrust.org/award-winning-restoration-on-the-wandle/

Low Water Levels in Carshalton Ponds

Leave a reply

Did you know that in times of dry weather, when groundwater levels drop, the top of the Wandle in Carshalton is kept flowing artificially?

We all need water to drink and wash, and in Carshalton, at the top of the Wandle, the water in our homes is provided by SES Water (who have recently changed their name from Sutton and East Surrey Water Company).

The water that comes out of our taps is the same water that springs out of the chalky geology of the North Downs as the source of the River Wandle. SES Water has a licence to abstract some of this water from the chalk aquifer and supply it to us for domestic use. But as part of this licence, they also have to ensure there is enough water in the River Wandle (because there are lots of species of insects, birds and fish in the river which need flowing water).

To do this when the aquifer is low and the springs are not flowing (usually in late summer), SES turns on an artificial recirculation system which pumps water from the Wandle just north of Goat Bridge up to Carshalton Ponds, where it replenishes the Carshalton arm of the river. Without this system, the Carshalton arm of the Wandle would be dry for much of the year.

As you may have noticed, Carshalton Ponds have been getting drier recently. We think this is because there are some cracks in the edges and bottom of the Ponds, which mean that when SES Water pump water into the Ponds, it seeps back into the ground before it can get out of the lower Pond and flow down the Wandle. This is causing SES Water to fail their licence requirements to keep the Wandle flowing, so at present they need to pump most of the water straight into the river below the cascade in Grove Park, with a small flow to the Ponds to top them up.

SES Water, the Environment Agency (EA) and Sutton Council are now working together to plan and deliver restorative works to the ponds and rectify the issue as soon as possible.

In the meantime, we can all do our bit by trying to save water. Look out for our exhibition coming up in Sutton Library (July 2017) where you can learn more about the past and present sources of the river, and simple actions we can all take to save water and help the Wandle.

Update: The Council were able to make repairs to the ponds and Sutton and East Surrey Water started pumping water back into the ponds on Sunday 9th April.

Floating Pennywort on the Wandle

Leave a reply

Alan Martin, our Invasive Non-Native Species Officer, has been very busy this last growing season. Working with our trained River Rangers to map all invasive plants on the Wandle, and with the newly trained Hit Squad to start controlling them, we are making great progress.

One species we’ve had some great success with is floating pennywort. This aquatic invasive plant can be found along the river from Carshalton to Wandworth. Alan has developed and implemented a combined manual and chemical approach to tackle this species from its source in Sutton, and work until it is out of the river in Wandsworth. While this is going swimmingly, he has also looked at two sites on the Wandle where pennywort has a stronghold: Watermeads and Ravensbury Park.

At Watermeads, the floating pennywort had infested a large backwater, a potentially key habitat for river wildlife with added aesthetic, recreational and ecological benefits. Working with the National Trust, Alan set to develop a management regime for this habitat to maintain it as an open water and keep pennywort at bay.

So how did we do it?

Manual Removal

To reduce overall biomass, several hand pulling events were held with volunteers from the National Trust and Wandle Trust – you may recall the epic Battle of Watermeads? Rafts of pennywort were cut away and towed to the bank using long grapple lines. The pennywort was then wheelbarrowed to a site away from the river where it would be left undisturbed to rot away.

Foliar spraying

After reducing the initial biomass, herbicide was then used on the regrowth. With Environment Agency permission, Alan and Richard (from the National Trust) applied the first spray of herbicide in February this year.

With this combined approach, open water was achieved!

Continued monitoring

The secret to this work is that the work actually never stops. As long as there is a source of pennyworth on the Wandle, there is a risk the backwater could become re-infested. The local angling club at Watermeads and the National Trust volunteers have taken ownership of this site and continue to check for signs of pennywort, pulling out new plants. By keeping on top of it this way, it should never reach the scale it was back in 2015.

So what’s next?

Working with Merton Council and the Friends of Ravensbury Park, we are starting a similar management plan on the lake in Ravensbury Park which has been full of pennywort for years. Watch this space!

Help the Environment Agency with the midge issue

Leave a reply

Midges are chironomids and spend the first part of their lives in the river itself. They then pupate and emerge as flying adults, surviving for only a few days to mate and lay eggs at the river’s surface. However, recently they have been emerging in huge numbers in Ravensbury Park and other sites along the Wandle, with some local residents unable to open their windows.

The Environment Agency are investigating the causes of these mass emergences and as part of this has commissioned a study to find out more about the type of midges causing the problem, and what can be done to alleviate it.

But they need your help…

The Environment Agency need you as their eyes on the river. If and when you experience a swarm of midges in your area, please call a report through to the EA hotline on 0800 80 70 60 as soon as possible, detailing the time of day and location of the swarm.

The Environment Agency will then be able to gain a better understanding of how widespread these occurrences are becoming and whether any specific locations are particularly badly affected. They’ll combine your reports with their own information to assist in establishing reasons for the high midge numbers and working towards appropriate recommendations to help alleviate the problem.

Award Winning Wandle Restoration

Leave a reply

Our rehabilitation work on the Carshalton Arm of the River Wandle recently won the Urban Category of the 2016 UK River Prize – an incredible achievement for all of those involved.

To express our thanks to everyone who has helped us along the way over the last 10 years, we have created a short film. So make yourself a cup of tea and enjoy…

Fish Passage Restored!

1 Reply

Last year we were working on a fish passage project on the Wandle at Trewint Street, Earlsfield.

Although there are many weirs on the Wandle which impede the migration of fish Trewint Street is one of the largest, with two weirs either side of a large concrete channel. With funding from the Environment Agency, Thames Water and Defra’s Catchment Partnership Action Fund (CPAF), we have restored passage for fish and eels, allowing movement to upstream habitats.

So how did we achieve this?

A bespoke fish pass was designed by Fishtek and installed on the weir by local contractors Amenity Water Management (AWM).

At the top of the right hand weir, a series of recycled plastic baffles were fixed onto the weir. These deepen and slow the flow of water and as you can see from the picture below, the baffles are arranged with a diagonal gap up to the top. This is the path the fish use to swim up the weir.

The baffles had to be fixed to the weir in dry conditions, and so sandbags were used to divert the water down the left hand weir, leaving the right hand side high and dry while our contractors worked. Watch the timelapse footage of AWM installing the baffles.

The second part of the fish pass were three large wooden pre-barrages at the bottom end of the island which were designed to slow the water down and reduce the drop in water level between the channel and the baffles.

Each barrage was notched to create a path for migrating fish.

To makes sure the pass works in low flows a huge piece of wood (7m long!) was placed at the top of the left hand weir to divert water at low flow down the right hand side and the fish pass. This ensures the pass works over a large range of flows.

Bristles were fixed to each of the barrages to allow eel passage. Eel tiles were then fixed alongside the baffles on the concrete wall making the weir passable to both fish and European Eels.

A big thanks to our contractors AWM, landowner Mr Lammas and Thames Water, Defra and the Environment Agency for their funding.

Wandle cleanup: November 2015: Plough Lane

1 Reply

The one with a record amount of rubbish!

Another month, another Wandle Trust cleanup, and for November we returned to Plough Lane in Merton.

After holding a two minute silence for Remembrance Day, 40 eager volunteers descended on the river to hunt down rubbish and clean up the surrounding area; supervised by myself and Basher.

Our wading team, led by Derek, got straight in and starting finding trugs and trugs of rubbish – it really was rich pickings!

I was soon presented with the first of many gifts from the wading team – my very own bike.

Another interesting find in the morning was a Boris Bike – the bike was still working and we used it for the rest of the day, travelling up and down the Wandle Trail with tools.

After a busy morning, we all stopped for some much needed cheese scones and chocolate cake, kindly made for us Ann and Tesco’s.

The afternoon saw more and more rubbish – including another children’s bike:

A TK Max trolley:

And a mattress frame:

Just when we were wrapping up for the day, a mystery item was found lurking in the depths of silt in the Wandle. Soon the entire wading team were called in as back up to find out what this item was, and everyone was pulling and heaving on the grappling hooks. What was it? Well it was a car frame we think…

All in all, we pulled out an amazing amount of rubbish from the Wandle at Plough Lane – just check out the rubbish pile!

So what did we find? 1 jumper, 1 pair of jogging bottoms, 1 safe, 1 toy guitar, 1 Boris bike, 1 TK Max trolley, 1 car seat, 1 set of false teeth, 1 hub cap, 1 Coolest Christmas Ever DVD, 1 tennis racquet, 1 stereo system, 1 coconut, 1 bike wheel, 1 Wix trolley, 1 floor lino, 2 hanging baskets, 2 traffic cones, 2 kids bikes, 4 car mats, 4 car carpets, 4 licence plates, rolls and rolls of carpet, and lots more bags of plastic, metal and other rubbish

Huge thanks to everyone who helped pack up van after the event, Ann for catering for our volunteers (cheese scones were delicious!), Louise for supervising the Event Tent, Wally for helping supervise everyone on the day, and the Waste Management Team at Merton Council for organising collection of all the rubbish the next day.

Thank you to all our volunteers for coming: Aaron, Abi, Aimee, Alima, Andrea, Andy, Ann, Anna, Audrey, Bill, Brandi, Charles, Chris, Danielle, Dave, David H, David S, Debora, Derek, Ed, George, Guy, Hannah, Helen, Hugo, Jan , Jane, John N, John S, Karoline, Lorenzo, Louise, Lucinda, Max, McKay, Mike, Nick, Nusrut, Patrick, Paul, Penny, Phil, Richard, Rose, Scarlett, Stewart, Theo, Tony, Victor, Wally, Wayne and Yvana.

So what did I learn from this month’s cleanup? Sometimes you get muddier packing the van than at the actual cleanup!

Dam, where’s all the water gone?

2 Replies

We’ve started work on the Trewint Street Fish Passage!

Fish passage on the River Wandle is impeded by over 30 in stream structures, the majority of which are weirs left from the milling era. These weirs and structures are a barrier to the movement of fish both up and downstream and also fragments and isolates habitats.

Trewint Street is one of the significant barriers to fish passage, with two weirs either side of a large concrete island. With funding from the Environment Agency, Thames Water and Defra’s Catchment Partnership Action Fund (CPAF), we have started our project to install baffles and a fish pass to the right hand side weir, allowing the movement of fish once more!

The pass will also benefit European Eel populations which have declined by over 98% in the last 15 years, with barriers to movement being a contributory factor.

So what are we doing?

On the right side channel, a series of baffles will be installed to the upper section of the concrete weir. These baffles are made from recycled plastic and fixed to the weirs in rows. They slow the flow down on the weir, deepening the water and allow fish to swim up the weir through notches cut into the baffles (Image, Fishtek).

In the lower part of the right hand channel, three notched barrages will be created to reduce the drop in water level between the channel and baffles. This will allow fish to easily swim up through the notches and through the baffles to new habitats beyond (Image, EA).

What will you see?

You will see a lot of building work on site over the next month as our contractors (Amenity Water Management (AWM) get started. You’ll also notice that the right hand channel is a lot drier than normal…

Amenity Water Management have created a sandbag dam to keep the channel dry allowing them to work on installing the structures. All will return to normal once work is complete.

We’ll keep you posted with updates as always, but for now Tim is just happy to have wet feet again!