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News

Aust Wharf Drone Footage

Mike French

Watch drone footage from late summer 2022 of the area at Aust Wharf Road to see the significant progress that has been made.

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Innovation News

Innovation: Precast Flood Defence Units

Innovation: Precast Flood Defence Units

18 October 2021. We are using precast concrete units to form the new flood barriers in several areas, including around Severn Beach. Thames Valley Construction produces and builds these units off-site in Newport, Wales. They are then transported directly to site and lowered into position. 

This method minimizes disruption for local residents and the environment, compared with pouring the concrete directly on site. Its benefits include:  

  • Quicker construction, all pre-cast were constructed on site and were ready ahead of the programmed installation date. On average we can install 26 pre-cast units per day. This is a significant time saving compared with cast in-situ where we would have only been able to install 8 to 10 units a week.
  • Long and variable alignment: 374 identical pre-cast units were installed (south of Severn Beach,) each 2.3m in length with only 3 in situ stiches required over the entire length of 860.2m
  • Fewer staff needed on-site
  • Safer
  • Reduction in traffic movements to and from site
  • Less noise and ground vibration.
  • A higher standard of quality control, in particular the surface finish of the pre-cast units.

We expect to install a total of around two kilometres of precast concrete units by the time we complete the works.

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News Why ASEA

Leader of South Gloucestershire Council: Why flood defences are so vital for our local communities

Leader of South Gloucestershire Council: Why flood defences are so vital for our local communities

18 October 2021. Councillor Toby Savage, South Gloucestershire Council Leader and Cabinet Member with responsibility for Climate Change, looks at the impact of flooding on local communities and the vital flood defence work being carried out to protect them.

According to the Association of British Insurers, flooding is the greatest natural disaster risk in the UK, with an estimated one in six properties in England and Wales now at risk of flooding. On top of that, Met Office data shows six of the ten wettest years on record have occurred since 1998.

Flooding can cause widespread disruption and have a devastating impact on people’s lives, their homes and businesses. There are few places more suited to considering the impact of climate change on real communities and businesses because of rising sea levels than the Severn Estuary.

The work being carried out as part of the Avonmouth and Severnside Enterprise Area (ASEA) Ecological Mitigation and Flood Defence project means thousands of homes and businesses in the area will be better protected. The project will provide 17km of improved flood defences, reducing flood risk to around 2,500 homes and businesses. The defences will supplement existing flood barriers and help protect the area from the increased risk of flooding from climate change and rising sea levels.

A recent report, by The Association of British Insurers and Flood Re (Flood Re are a joint initiative between the Government and insurers), reported that river flood defences provide protection to flood risk communities valued at savings of £568 million a year. The research suggests that without defences, losses could amount to approximately £958 million a year, whereas with defences that figure reduces to £388 million a year.

The newly constructed flood defences, stretching between Aust in South Gloucestershire and Lamplighter’s Marsh in Bristol, will help encourage businesses to invest in the area and are expected to unlock 12,000 new jobs by 2026. This will deliver a significant boost for our regional and national economy.

A key milestone achieved this summer was the installation of precast concrete flood defence wall units in the Severn Beach area. To the north of Severn Beach, this is largely complete. Together with the work south of Severn Beach, approximately a kilometre of flood defence wall has been put in place. The walls consist of 428 units, all of which were precast offsite, meaning they were put in quickly and with the minimum of disruption to the local community.

Once the whole ASEA project is completed in 2026/2027, thousands of homes and businesses in our area will be better protected against the risk of flooding. I look forward to seeing the project continue to progress over the next few years, reducing the flood risk posed by climate change and rising sea levels.

Categories
Innovation

Chestle Pill Outfall Design

Chestle Pill Outfall Design

There are a number of existing outfalls throughout the ASEA project area. We need to raise the height of the outfalls, in-line with the new flood defences. In many cases, in order to support the increased height, we need to widen the outfalls, to support the extra load.

At Chestle Pill Outfall, the existing outfall structure would not have supported the additional load from the increased height. To overcome this, we looked at ways of reducing the weight of the existing earth over the outfall. We identified the best way to do this was to replace some of the existing earth over the structure with lightweight high strength modular cells. This network of cells has a 95% void ratio – being much lighter in weight than the ground they will replace but still robust enough to support the same load. It is also recyclable at the end of its service life.

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News

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