TEAM2100 Barnes and Mortlake project

Closes 4 Feb 2022

Opened 10 Feb 2021


Flood defence works to take place in Barnes and Mortlake

There will be some flood defence work taking place in Barnes and Mortlake to strengthen and improve the tidal defences to protect homes and communities.

The proposed works will be taking place across the following locations:

  • An outfall into the River Thames near White Hart Lane, postcode SW14 8SW.
  • An outfall into the River Thames near Elm Bank Gardens, postcode SW13 0NS.
  • Two culverts running under White Hart Lane and Elm Bank Gardens, originating from Beverley Brook.

A compound is scheduled to be set up towards the end of May 2021 at Jubilee Gardens, and is programmed to be demobilised again by the end of September. The majority of works will take place between 08:00 until 18:00, Monday to Friday. However, as the works on the outfalls are tide dependant, there may be several instances where extended working hours will be required, from 06:00 to 22:00. We are taking steps to ensure that local residents, businesses and the general public remain well informed regarding the works taking place, and the footpath closures and diversion routes will be clearly signposted.

As a result of the constrained working environment along the towpath and the movement of plant along the towpath, it will be closed from Barnes Bridge to Jubilee Gardens. There will be a sign-posted diversion in place which will be step-free, and lead cyclists from the towpath to Mortlake High Street, while pedestrians will be able to use designated crossing points and the pavement adjacent to Mortlake High Street. The site compound will be set up in Jubilee Gardens, which will result in the loss of approximately half the available green space. However, once the works are completed, the compound site will be reinstated.

Our project factsheet gives further information about the project and potential impacts. The Frequently asked questions (FAQs), will be continually updated as the project progresses.

Please see below a map of the project works 

Please see below an image of the proposed works of the Culvert in Barnes and Mortlake

The Scope of works

The current system of culverts (that store water during periods of high tide) and outfall structures work alongside the tidal barrier at Ashlone Wharf helping to reduce flood risk in the area by preventing tidal water from the Thames entering into Beverley Brook. The existing outfall structures are currently equipped with ageing timber flap valves which are at the end of their useful life, and are situated within a confined space with no means of opening or inspecting the flap valves from ground level. Periodically the flap valves are prevented from closing due to large branches lodging themselves under the gates and posing a flood risk.

The proposed works will install High-Density Polyethylene (HDPE) flap valves to replace the existing flap valves, which will ease maintenance operations and provide a highly effective way to prevent water backflow into the culvert. Additionally, The Thames Estuary Asset Management (TEAM) 2100 will:

  • Install a winch lifting system which will enable the flap valves to be inspected safely from ground level and allow the culverts to be cleared of debris
  • Remove part of the existing riverbank above the outfall chamber to install a ventilation grid, which will allow the winch lifting system and the flap valves to be inspected via camera
  • Seal and repair cracks in the culvert joints using an epoxy resin
  • Enlarge the manhole covers for entering the chamber to meet the current standards.

In order for these works to take place, we have applied for a marine licence from the Marine Management Organisation. The Marine Management Organisation is required to wait a period of 28 days from the date of the first newspaper publication for public representations prior to issuing the licence we require to undertake these works. The licence application was be published in the Richmond and Twickenham Times on 5th February 2021.

If you would like to view any documentation and add any comments, you can access the public register online at, and view the consent application using the reference number MLA/2021/00010. We are currently still in discussion with The London Borough of Richmond Council regarding the compound layout. Should any details change, the documentation will be amended and re-issued to all regulators.


The Thames Estuary Asset Management (TEAM) 2100 Programme is a 10 year capital investment programme to refurbish and improve existing tidal flood defences, one of the key first steps in delivering the Plan. The works in Barnes and Mortlake are being carried out by TEAM2100. The Thames Estuary 2100 Plan sets out how the Environment Agency and its partners can work together to manage tidal flood risk in the Thames Estuary, adapt to a changing climate and plan for the future of our riverside, today and into the next century. Climate change, population growth and ageing flood defences mean that tidal flood risk will increase over time, unless this risk is carefully managed.

The Thames Estuary has a world class system of defences, including 8 major barriers, around 330km of walls and over 900 structures (such as flood gates, outfalls and pumps), which work together to protect the 1.3 million people and £275 billion worth of property and infrastructure from increasing tidal flood risk, whilst adapting to climate change, enabling sustainable development, protecting the social and commercial value of the Thames, and enhancing estuarine ecosystems.

You can read more about Thames Estuary 2100 here: and download a copy of the Plan here:

If you would like to know more about the project or have any questions or concerns, please contact the project stakeholder lead using the details below.

Ben Frei, Stakeholder Engagement Lead Email:


  • Anyone from any background


  • Flood management