Plans for the drainage system serving the first 109 homes at Oakmere Rise, north of Yeovil’s A359 Mudford Road, have been approved despite continued concerns about flood protection for communities downstream.
Somerset Council’s planning committee voted seven to three in favour of the amended proposals, with one councillor abstaining, after around two hours of debate. The decision allows the first phase of the development to move forward with a drainage design that differs from the system approved as part of the original outline permission.
How the Oakmere Rise drainage design is changing
The constructed wetlands originally proposed for the development will be removed. They will instead be replaced by attenuation ponds and reed-beds, which will form part of a sustainable urban drainage system, commonly known as SUDS.
Land that had been earmarked for the wetlands is due to become public open space. The treatment wetland was planned for the northern edge of the site, where it would have provided a substantial green buffer and helped manage phosphate levels affecting the Somerset Levels and Moors.
Oakmere Rise is being built on the Mudford Sock site. Yeovil LVA LLP secured outline planning permission on appeal in March 2024 for 252 homes. The site was subsequently sold to Bloor Homes South West, which submitted the detailed proposals for the first phase.
Why communities downstream objected
Representatives from Ashington, Chilton Cantelo and Mudford questioned whether the replacement system would offer the same flood storage and protection as the cascading wetlands set out in the original plans.
The 3 Villages Flood Group said the planning inspector had considered the wetlands to have a wider flood-mitigation role, rather than viewing them only as a measure for controlling phosphate. The group also raised concerns about the resilience of downstream communities during construction, when additional water could enter the shared drainage network.
Monitoring by the Yeovil Community Rivers Trust found rainfall near the site was approximately 37% higher than the developer’s models had allowed for. This led to calls for the combined effect of other developments sending water into the same drainage system to be assessed.
During the committee meeting, Councillor Stephen Page, the Liberal Democrat representative for Somerton, asked whether the revised arrangements could create health or safety risks, particularly for children living on the estate. Planning officer Dawn de Vries told councillors: “an unsafe scheme would not be approved”.
What happens next at Oakmere Rise
Councillors Mike Stanton and Oliver Patrick supported the amended plans. Stanton said the replacement system was likely to be more environmentally friendly and visually appealing.
Patrick pointed to a projected 20% biodiversity net gain, described as twice the minimum requirement. He also said mechanical pumps for an artificial wetland would have a greater carbon footprint than passive SUDS.
Further decisions are expected before Christmas on the detailed plans for the first phase and on a separate application intended to speed up construction of a new crossroads serving the estate’s main access.
Nearby communities are continuing to scrutinise how the revised drainage system performs as Oakmere Rise is built.