Long Rock sea defence project under way

Tuesday 5th March 2019 00:40 GMT

One of Cornwall’s most iconic seafronts is being protected and improved for residents as work starts on a £3.7 million sea defence project at Long Rock.

Cormac will install 300 metres of new rock armour sea defences on Long Rock Beach in a bid to safeguard the coastline.

The work, which is being carried out on behalf of Cornwall Council, will be completed by September or sooner if weather conditions are favourable.

It is set to be followed in the autumn by environmental works to Marazion Marsh, subject to planning permission.

Cormac has set up a site in Long Rock Car Park from this week for the duration of the work which involves placing rocks on the coastline to absorb the impact of storm waves and reduce erosion.

While this car park is in use long-term car parking passes for Long Rock will be valid in Marazion Station Car Park where the beach can be accessed via a footpath.

Long Rock Beach will remain open but some areas where work is taking place will be sectioned off temporarily.

The project aims to safeguard the Long Rock and Mount’s Bay coastline and improve access to the beach as well as reduce flood risk, protect the nearby railway line, A30 and South West coast path, and offer environmental benefits for Marazion Marsh.

Once the area is protected Cornwall Council can develop a longer-term strategy to provide protection to the coastline for the long term.

Cornwall council says the project will:

  • Reduce the level of flood risk to the community of Long Rock, which if left will worsen as current defence fails and environmental impacts of climate change increase.
  • Providie increased coastal protection to the Great Western Railway mainline and A30 serving strategic transport links in and out of Penzance and access to the Isles of Scilly.
  • Protect commercial assets and infrastructure including 295 residential properties and 65 commercial properties.
  • Create better conditions for sustained economic growth by reducing obstacles to local investment, complementing new development and allowing greater connection with customers.
  • Improve the natural environment by protecting Marazion Marsh, creating an increased area of open water for habitat and wildlife and connecting river catchments to the coast at Mounts Bay in accordance with Mounts Bay Shoreline Management Strategy and the Environment Agency’s Water Level Management Plan (WLMP).
  • Create widespread flood awareness and improved ownership of flood risk management within the local community.
  • Reduce the long-term costs of responding to future, large-scale flooding events in the Mount’s Bay area.
  • Provide eel passages by connecting the catchment to the coast at Marazion.

The works involve:

  • Approximately 300 metres of new rock armour sea defence works with improved access to the beach and seating.
  • Raising the water level in Marazion Marsh, which coupled with dredging and a silt trap will increase water storage capacity and create 3.9 hectares of improved wetland habitat.
  • Provision of four eel passes on the Trevaylor and Chyandour Streams.
  • Achieving a CEEQUAL Excellent award to demonstrate the project’s sustainability.
  • The works are being wholly funded by grants from the European Regional Development Fund (ERDF) and the Environment Agency Flood Defence Grant-in-Aid (FDGiA).
  • They are being delivered by Cornwall Council in partnership with the Environment Agency and the strategic partners; the RSPB, Natural England, Network Rail and the St Aubyn Estate.

Cormac Solutions Ltd is the designer and Ward Williams Associates is the project and cost manager.

Cornwall Council’s portfolio holder for Environment and Public Protection Sue James said:  “These works will protect the historic Longrock seafront while improving access to the beach, and protecting the adjoining wetlands. 

“They will have a significant impact on protecting Cornwall’s natural environment and a more resilient coastline will allow the area to attract more investment and regeneration.”

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