Thames Launches £20m Twenty 4 Twenty SuDS Campaign

Southwark Flood Defence - Stormcell® Installation

Thames Water has launched the Twenty 4 Twenty initiative –  a £20m campaign aimed at transforming at least 20 hectares of hard, impermeable surfaces into sustainable drainage projects over the next five years.

The water company hopes the SuDS will ease pressure on the sewer network, reducing the risk of sewer flooding and pollution.Twenty 4 Twenty will focus on communities served by ‘combined sewers’, which collect both waste water from toilets and sinks, and rain water from streets, roofs and driveways.

The initiative aims to “find new ways to transform acres of grey concrete into beautiful green spaces,” promises the announcement.  “Areas dominated by concrete and asphalt will be turned into rain gardens and natural drainage areas and concrete pathways will be replaced with permeable paving, able to allow water to filter through and soak away into the ground or enter the sewer network much more slowly.”

Thames Water says the initiative builds on existing SuDS which Thames Water has been involved in, including the award-winning Dulwich Park scheme in partnership with Southwark Council.  As featured in Engineering Nature’s Way , £4.28 million Flood Defences Go Underground Overground in London Parks, Hydro International’s Stormcell®and Stormbloc® modular block storage systems were used as part of the flood relief solution, providing underground attenuation tanks in the sensitive location.  The project was completed in 2014 and has reduced the risk of sewer flooding at more than 100 properties in the area.

At the launch of London’s Sustainable Drainage Action Plan, Thames Water director Richard Aylard said: “We work really hard to make sure our sewers are as empty as possible whenever heavy rain is expected but it’s important we also look at how to reduce surface water getting into them in the first place.”

Read the Thames Water announcement.


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