Rock Ramp Perturbation Fish Pass
This project was to construct a rock ramp perturbation fish pass at the site of twin weirs enabling migratory fish to access the upper River Ouse once again.
Two temporary dams were installed to divert the entire flow of the river over the right bank weir leaving the left channel dry for the construction of the fish pass.
Two diesel and two electric submersible pumps were used running 24 hours to keep the working area dry for the duration of the works.
The channel was excavated in order to construct the base for the fish pass. Once this had cured the boulders were imported and placed out before being set in concrete.
The upstream and downstream ends of the fish pass were protected with a smaller grade of rock.
The Environment Agency
Guildbourne House, Worthing
Sharpsbridge, Uckfield, East Sussex
- Armorloc interlocking concrete blocks
- Granite rip rap stone
- Imported crushed stone
- Woven geotextile