Restoring English rivers: evaluating the ecological and policy dimensions of weir removals and wild salmonid recovery
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2025-06-20
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en
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Small dams and weirs are widespread across rivers in the United Kingdom, yet they significantly degrade habitat quality and obstruct the migration of salmonid species by fragmenting flow and isolating spawning grounds. These disruptions contribute to poor ecological status in many UK rivers, with barriers like weirs identified as a leading cause of failure to meet Water Framework Directive targets. This thesis investigates the ecological and managerial outcomes of small weir removals, focusing on changes in water quality, river connectivity, and the recovery of wild salmonid populations.
A mixed-methods approach was employed, combining quantitative analysis of water quality and fish population data with qualitative insights from stakeholder interviews. Case studies were conducted at Scotton Mill Weir (River Nidd), Snake Lane Weir (River Ecclesbourne), and Samlesbury Weir (River Ribble). Results show significant post-removal reductions in orthophosphate levels, modest improvements in nitrate concentrations, and an increased presence of salmonid species.
However, the findings also reveal major gaps in post-removal monitoring and policy enforcement. Interviews with stakeholders from the Wild Trout Trust and The Rivers Trust highlighted that inconsistent data collection, limited funding, and unclear regulatory requirements hinder long-term ecological evaluation. Although small-scale weir removals can meaningfully support river restoration, their success depends on stronger governance, stable financial support, and mandatory, standardised monitoring frameworks.
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Faculteit der Managementwetenschappen