Flood Defences go Underground, Overground in London Parks

UK Southwark, South London Case Study

Stormbloc® and Stormcell® modular geocellular stormwater storage systems retain Grade II listed park landscaping whilst preventing flooding in Southwark, South London, UK

A £4.28m award-winning flood defence project in Southwark, South London, is combining above and below-ground temporary flood storage to create a pioneering solution at two sensitive and historic parks.

The project, led by Southwark Council, is designed to provide much-needed protection for Herne Hill and Dulwich, an area prone to flooding as a result of being in a low-lying catchment of the culverted Effra River – one of London’s so-called lost rivers.

The design involves the construction of above- and below-ground temporary flood storage to capture overland flow during periods of heavy rainfall.  Above ground, a mixture of natural earth bunding and dwarf-brick retaining-wall structures are being constructed in the Dulwich, while  Belair Park a combination of earth bund and detention basin  to control peak surface water flows. However, a key element of the flood defences is underground geocellular block storage from Hydro International to provide a solution that is sensitive to the needs of the park locations.

The innovative scheme won the 2015 Environment Agency (EA) award for Partnership Project Excellence for its integrated partnership working and community engagement.  Community groups had initially objected to flood relief measures involving the use of overground pond storage in the Grade II listed park areas.  Engineer Mouchel’s sensitive design proposed using Hydro International’s Stormcell® and Stormbloc® modular block storage systems.

Read the full case study here


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