Detailed Design Services for Tumbling Bay Riverwell Weir and South Branch Sluice Fish Passages

This is an opportunity to provide detailed design services for fish passage installations at Tumbling Bay Riverwell Weir and South Branch Sluice on the River Colne. The outline design phase has been completed and was funded through the Rural Payment Agency's Water Restoration programme. This detailed design contract will be funded by Affinity Water and represents continuation of the fish passage project with the same contractor who completed the high-quality outline design and has established site knowledge. The successful contractor will build upon the existing outline design to develop comprehensive detailed specifications, drawings, and technical documentation required for construction. This project supports fish migration and river ecosystem restoration objectives.