TEAM2100: Barnes and Mortlake project

Closes 4 Feb 2022

Opened 10 Feb 2021

Overview

*Update September 2021*

The planning application for the temporary site compound and the associated works for the TEAM2100 Barnes and Mortlake project has been validated and is now open to view. The application can be viewed on the Richmond Planning Portal under the reference 21/3003/FUL.

Following conversations with the project team and the contractor, we have made the decision to delay the works.

Following further engagement within the project team and with the contractor, it has become apparent that the works, which had originally been delayed to the autumn 2021, would have to be partly carried-out during a high-risk time of year.

An element of the works would need to take place during the winter months, during which time higher rainfall, and therefore higher river levels are to be expected. This leads to a high-risk working environment for the workers. This has led to the decision to reschedule all works to spring/summer 2022. 

Please note we have updated our project factsheet and our FAQ's.

Please see below the link to the public information event which was held on the 22nd April 2021.

Public information session

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.

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.

The function of the White Hart Lane Culvert and Elm Bank Culvert:

The two culverts originate from the Beverley Brook, and branch off at Priests Bridge (White Hart Lane Culvert) and Westfield Sluice (Elm Bank Culvert). The function of the culverts is to carry water from the Beverley Brook to the river Thames during high water levels in the Beverley Brook to reduce the risk of flooding further downstream. The culverts also act as a water storage area during high tides, when the flap valves at the two outfalls into the River Thames are closed, preventing water to flood up stream, and hold the water from the Beverley Brook until the tide lowers again and the water can flow into the Thames.

Background

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 Thames Estuary 2100 Plan. The programme runs until March 2025. The TEAM2100 programme pioneers a new asset management approach for the Environment Agency, investing early to maintain the condition of our flood defence assets to reduce the risk of failure. The programme started in 2014 and is being jointly delivered by the Environment Agency, Jacobs and Balfour Beatty, along with other suppliers. The works in Barnes and Mortlake are being carried out by TEAM2100.

Within the Thames Estuary, a complex network of defences, including 9 major barriers, around 330km of walls and embankments, and over 400 other structures (such as flood gates, outfalls and pumps), work together to protect over 1.4 million people and £321 billion worth of property from tidal flooding.

Climate change, population growth and aging flood defences mean that tidal flood risk will increase over time, unless this risk is carefully managed. In 2012, the Environment Agency and partners published the Thames Estuary 2100 Plan, which sets out a strategy to manage this risk until the end of the century and beyond.

You can read more about Thames Estuary 2100 here: www.gov.uk/government/publications/thames-estuary-2100-te2100/thames-estuary-2100-te2100 and download a copy of the Plan here: https://www.gov.uk/government/publications/thames-estuary-2100-te2100

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: team2100@jacobs.com

Audiences

  • Anyone from any background

Interests

  • Flood management