The Adur Tidal Walls Scheme, which was delivered by construction and civil engineering firm Mackley, was named winner of the Infrastructure category At the RICS Social Impact Awards, South East, in June.
Costing £31m, the defences have reduced the flood risk for nearly 2,500 residential and commercial properties in Shoreham and East Lancing.
The scheme was completed in February 2019, and was named Climate Resilience Project of the Year at the British Construction Industry Awards later the same year.
The defences cover the west bank of the river all the way from Shoreham Fort to the airport, and the east bank from Coronation Green to the A27 – 7km in total.
At its official opening, councillor Neil Parkin said it would have ‘an immeasurable impact’ on residents and businesses.