Option 3: Full Weir Removal & Rock Ramps within the Carshalton & Croydon Branches
Solution
This option consists of either removing one or both weirs associated with Shepley Mill, desilting, regrading the bed, constructing rock ramps within the Carshalton and Croydon branches of the River Wandle to improve fish passage; and installing trash screens at the entrance of one or both culverts to minimise 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
Although Option 3 has the potential to allow for the safe passage of fish and eels through Shepley Mill, contribute to GEP under the WFD and comply with the Eels Regulations, a similar hydrological outcome (and associated impacts) is predicted as that for Option 1. Overall the suitability of this option to meet the project objectives is considered Low.