IWA has responded to South East Water’s proposals for the Broad Oak Water scheme in Kent. The response emphasises the importance of protecting navigation rights on the tidal River Stour, noting that this stretch has been affected by two significant problems, eutrophication (over enrichment with nutrients leading to excessive plant growth and damage to wildlife) and siltation. IWA argues that studies for the scheme must demonstrate that it will not worsen these issues and should ideally contribute to improvements.
The document highlights how over-abstraction led to saline intrusion as far as Stodmarsh Nature reserve, which was then mitigated by pumping sewage discharge into the river, causing eutrophication. The nutrient‑rich sewage effluent caused abnormal weed growth that raised the riverbed, hindering navigation. IWA stresses that mitigation for these issues, particularly improved sewage treatment, should be integral to the scheme.
On siltation, IWA warns that the unmanaged tidal Stour is becoming increasingly difficult to navigate and encourages South East Water to support future river management arrangements. It also calls for careful design of inlet and outlet structures to avoid harmful transverse flows, referencing established engineering guidance.
The response further requests clarity on emergency discharge procedures and their implications for river users. Finally, IWA expresses support for the proposed recreational facilities at the reservoir.
[Photo: The Kentish Stour at Grove Ferry – by Neil Edwards]
