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Hesselberg Hydro

Stansgate Seawall Replacement

Seawall

A 600 metre section of concrete-block (Essex & Canewdon) seawall revetment protecting houses, a SSSI and farmland had reached the end of its useful life with many areas of significant damage evident.

Seawall

After extensive optioneering and feasibility studies the chosen repair method was to remove the existing blocks, extend the toe into the foreshore by a minimum of 1m, fill voids with LSA, and then place 150mm OSA armour layer on a 150mm LSA filter layer.

Seawall

The old Essex blocks were placed at the toe to provide additional scour protection. This repair method has been used successfully on the Blackwater Estuary since 1989 and the starting point of the 2019 works was at the end of a OSA/LSA revetment which was placed in 1990 and was still in excellent condition.