Research and analysis
Weir removal, lowering and modification: a review of best practice
Environment Agency report which looks at the impact that removing or changing a weir (a low dam built across a river) has on rivers and their ecosystems.
Ref: LIT 8946 ZIP, 4.29MB
This file may not be suitable for users of assistive technology. Request an accessible format.
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email email@example.com. Please tell us what format you need. It will help us if you say what assistive technology you use.
Removing, lowering and modifying weirs can have beneficial effects for rivers and their local environments, and these improvements can also help satisfy the requirements of the EU Water Framework Directive (WFD) – European legislation on integrated river basin management introduced in 2000.
However, there was very little information available about such weir projects in England and Wales, so this report pulled together the available scientific evidence on weir removal to inform best practice and identify gaps in our understanding. The study made use of a literature review, the National River Restoration Inventory, an online survey of people involved in specific projects, technical experts and a series of case studies covering a range of issues experienced in different projects.