Tag Archives: Eels

Giving eels a helping hand on the Wandle

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!

Fish Passage Restored!

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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.

Dam, where’s all the water gone?

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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!

Hogsmill eels get a helping hand

The Wandle Trust

Part of the South East Rivers Trust, Reg. Charity No. 1091000