CCA2/3 Dalkey Tunnel to Shanganagh-Bray Wastewater Treatment Plant
CCA2/3 is the section of the coast that stretches from Dalkey Tunnel to just south of Killiney Martello Tower (near Shanganagh-Bray Wastewater Treatment Plant). This frontage is mainly non-urban with natural cliffs and intermittent man-made structures supporting the railway corridor.
The Emerging Preferred Scheme for CCA2/3 to be taken forward to public consultation is rock revetments and concrete walls with walkway.
The main advantages identified with the Emerging Preferred Scheme are:
- Non-complex and comparatively low-cost construction;
- Minimal maintenance burden and expenditure;
- Robust solution;
- Low material consumption and waste;
- Preferable option for carbon management; and
- Low impact on noise, vibration and air quality.
Rock revetment
- A rock revetment will be constructed on the beach at the toe of the cliffs in front of existing structures at Whiterock (south of Whiterock Beach). The rock revetment will comprise a minimum of two layers of natural rock boulders. The rock size has been selected to provide long-term stability and to allow for climate change. This rock will be of high quality to ensure that it has a long lifespan.
- The rock revetment will absorb wave energy, reduce wave run up and overtopping and stabilise the shoreline.
- Where required, the height of the existing walls behind the revetments will be raised to manage the overtopping risk.
Walkways
- At Killiney Beach, there are existing walkways along the rear of some sections of the beach. These walkways will be extended to the south and will provide continuous access along the rear of the beach with access down onto the beach provided at regular intervals. These new structures will prevent waves eroding the slopes that sit under the railway corridor at this location.
- Buried rock will be placed at the toe of these new structures to prevent any undermining if the beach levels lower in the future.
Useful Material and Downloads
- CCA2/3 Brochure
- Emerging Preferred Scheme CCA2/3 Plan
- Cross Section New Seawall with footpath at southern Killiney
- Cross Section Rock Revetment Fronting Existing Seawall at Whiterock
- Emerging Preferred Scheme CCA2/3 Preliminary Options Selection Report
Appendices
To make a submission please visit the How to Engage section.