The £45 million Shoreham Adur Tidal Walls scheme was carried out by Mackley, as part of Team Van Oord and on behalf of the Environment Agency, Coast to Capital Local Enterprise Partnership, Adur District Council and West Sussex County Council. The project was designed by Mott Macdonald.
Work was completed in February 2019, significantly reducing flood risk to more than 2,300 properties in Shoreham and East Lancing – as well as protecting important local infrastructure including the road network, railway line and Shoreham Airport.
Designed to last for 100 years
Construction of the new 7.2km tidal defences began in September 2016, as many of the old defences came to the end of their useful life.
The new defences cover 1.8km on the east bank of the River Adur between Coronation Green and the A27 road bridge – and 5.4km on the west bank between the river mouth and the A27 road bridge.
They are formed of embankments, sheet pile walls, rock revetments, flood glass, and property level protection, and are designed to last for 100 years – though have been built so that they can easily be further raised after 50 years if necessary.
The project also involved improving the public footpaths along the route of the defences, and approximately 1.4 hectares of compensatory saltmarsh habitat have been created.