Redbridge Council’s proactive approach to flood defence is setting a new standard for urban resilience, with the successful rollout of Hydrorock technology offering a blueprint for other flood-prone areas. After a trial in Seven Kings High Road demonstrated its effectiveness, the council has expanded the system to Hermon Hill and Wellesley Road in Wanstead Village—locations historically vulnerable to flooding, particularly for residents in basement flats.
Hydrorock’s sponge-like blocks absorb and gradually release water, preventing sudden surges that overwhelm sewer systems. Combined with permeable paving, this dual approach ensures rainwater is managed efficiently, reducing the risk of road and property flooding. The system’s success in Seven Kings, where no flooding occurred despite heavy rainfall, underscores its potential to mitigate climate change-driven extreme weather events.
Beyond Hydrorock, Redbridge Council is implementing a broader suite of flood alleviation measures, including sustainable drainage schemes (SuDS) like raingardens and adapted planters. These initiatives mimic natural drainage processes, slowing water flow into sewers and drains. The council’s efforts have already enabled the borough to hold and divert 1.6 million litres of rainwater—a volume equivalent to 64,000 five-minute showers or 8,889 council wheelie bins. This capacity is critical in preventing water from pooling on roads or backing up into homes and businesses.
“Hydrorock is one of a number of measures we’re putting in place to help keep local homes, businesses, and communities safe from flooding,” said Cllr Jo Blackman, Cabinet Member for Environment and Sustainability. “With climate change making extreme weather more likely, Redbridge Council is taking a proactive, practical approach to keep our communities safe, and is committed to continued investment in sustainable drainage systems and innovative technology to boost the borough’s flood defences.”
The Environment Agency has taken notice of Redbridge’s efforts, with Flood and Coastal Risk Management Advisor Mandy Sullivan praising the council’s initiatives. “It was good to see these new flood prevention measures in place,” Sullivan said. “It is clear to see that the London Borough of Redbridge are doing some great work to reduce flood risk.”
Looking ahead, Redbridge Council plans further flood risk reduction works in Monkhams Lane, Clayhall, and around schools at risk of flooding, subject to grant funding approval. Over the next decade, the council will invest just over £11 million in flood risk reduction schemes, in addition to the £2.5 million already spent since 2022.
This strategic investment reflects a growing recognition that climate change demands innovative, multi-layered solutions. As flash floods and intense storms become more frequent, Redbridge’s approach—combining cutting-edge technology with sustainable drainage—could serve as a model for other urban areas facing similar challenges. By prioritising flood resilience, the council is not only protecting homes and businesses but also fostering a more sustainable and secure future for its residents.