Long Rock Coastal Protection works

 

 

 

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The Long Rock Coastal Improvements Project is a £3.7m initiative and is part-funded by the European Regional Development Fund. The scheme is being carried out by Cormac Solutions Ltd. The project is to improve resillience to flooding and coastal erosion along the frontage of Mount's Bay. This runs from Mount's Bay between Marazion and Eastern Green. 


Long Rock 

In January 2016, severe storms caused substantial damage to the wall, which supports a well-used coast path and, only a few yards further back, the mainline railway connecting Penzance to London Paddington. Emergency works were quickly carried out by Network Rail, but the sea wall showed signs of further deterioration, resulting in Cornwall Council closing the coast path in the interests of public safety. Further works by Cormac in July 2016 stabilised the wall, and the coast path was reopened.

Despite the remedial fixes working well, they were only a temporary measure. Damage around an exit for a stream that passes through the wall is only the most visible part of wider issues that will continue to worsen unless action is taken.

The works comprised of adding 350 metres of new rock armour alongside the existing Public Right of Way next to the Network Rail depot which ties into the existing sea defences either side of it. Large boulders were installed in front of the wall, which will help absorb and redistribute energy of incoming waves. In turn, this reduced erosion and the potential for further damage, and so substantially prolongs the life of the structures behind the armour.

Three ramps were installed between the footpath and the beach to provide better access with seating areas also provided.

The works were completed in August 2019.

Marazion Marsh

Habitat improvements to the Marazion Marsh have now completed on site. The works aim to aim to improve the nature environment by 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).

New open water channels have been created. These were created using an amphibious excavator and these works were completed at the end of December 2019.

The installation of a new water control device was completed in June 2020. This will allow water levels of the marsh to be raised during summer months to protect habitat areas. During the winter months the water control device will help drain the marsh and provide flood protection for the surrounding area.

Additional project information and diagrams:

 

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