Work is under way on two flood-resilience projects in Ruislip, with a third due to begin in October. The programme combines woodland measures and watercourse improvements along the River Pinn with expanded storage at Bessingby Park. The schemes are intended to slow or temporarily hold rainwater and reduce flood risk; they are not a guarantee that flooding will be prevented.
At Park Wood, workers are installing five leaky dams, creating a new pond and carrying out other woodland interventions. The site is a designated Site of Special Scientific Interest. The measures are designed to slow water moving towards the River Pinn after heavy rainfall and temporarily hold it back, reducing risk to downstream properties including those on Park Avenue and Broadwood Avenue.
The Park Wood work is expected to finish later in October. It is funded by the Thames Regional Flood and Coastal Committee’s Natural Flood Management Fund and the HS2 Community and Environment Fund. The current works add to earlier flood-management measures in the woodland, where more than 40 leaky dams were installed during a previous project phase.
Watercourse and storage improvements
A second scheme at Pinn Meadows has also begun. It will restore and naturalise sections of Elma’s Ditch, expand an existing groundwater pond to increase its capacity, and alter pipes feeding the ditch to help manage excess water. The council’s detailed project plan also describes improvements to outfall pipes and restoration of an existing flood-defence bund.
The Pinn Meadows works are scheduled to run from early October to early December. They are supported by the Department for Environment, Food and Rural Affairs’ Natural Flood Management Programme. Together with the Park Wood measures, they form part of an area-wide approach to managing flows along the River Pinn corridor. The planned changes are intended to slow, store and manage water during heavy rain, while improving local habitats.
The third project, at Bessingby Park, is due to start in October. The attenuation pools there will be deepened and widened so they can collect rainwater and release it gradually. Soil excavated during the work is to be used to build a protective mound along the park’s southern boundary. The project is funded through Hillingdon Council’s Carbon Offset Fund and is expected to be completed in November.
Three sites, different approaches
The projects use different forms of flood management: slowing runoff through woodland, improving a ditch and pond system, and increasing the capacity of parkland pools. The approach is intended to manage water at several points rather than rely on a single barrier. Project descriptions also identify environmental benefits, including habitat improvements and a more natural watercourse at Pinn Meadows.
Hillingdon Council said the schemes are part of its work to strengthen the borough’s resilience to extreme weather and protect residents, businesses and green spaces. Its stated completion windows are forecasts, and the information available does not establish that the works have already reduced flood impacts or quantify the reduction expected at any specific property.
Flood risk depends on rainfall and local conditions, and the projects are described as risk-reduction measures. The council’s programme therefore combines natural features that can hold or slow water with engineered changes to drainage and storage capacity. Residents near the three sites may see work continuing into the autumn, with the Park Wood scheme expected to finish later this month, Pinn Meadows by December and Bessingby Park in November.
