Option 1: Full Weir Removal Only
Solution
Full weir removal is on top of the hierarchy of suitable solutions to improve fish passage along the river systems. As such, Option 1 would overall consist of completely removing one or both weirs associated with Shepley Mill, desilting, regrading the bed; and installing trash screens at the entrance of one or both culverts to minimise the risk of debris entering/blocking the culverts. In addition, to ensure the successful migration of fish through either of the culverts, fish friendly modifications to the culverts, such as baffles, could be implemented.
Concept design
Appraisal
Option 1 has the potential to allow for the safe passage of fish and eels through Shepley Mill, contribute to Good Ecological Potential (GEP) under the WFD; comply with the Eels Regulations. However, this option would potentially impact upstream water levels, in particular during low flows (with potential fish passage implications), change existing flow habitats used by wildlife, impact the hydrological connection with Wilderness Island and increase flood risk. Overall, the suitability of this option to meet the project objectives is considered Low.