Rossaveel Deep Water Berth

GDG was commissioned by the Department of Agriculture, Food and the Marine (DAFM) to carry out a peer review of a planning design for a new quay wall in Rossaveel Fishery Harbour Centre (FHC), Co. Galway, in an effort to reduce the associated civils and dredging construction costs. The new quay forms the primary structure as part of a deep-water berth development proposed at the FHC. The proposed form of construction for the new 200m long wall was caissons, however giving that installation of caissons requires extensive excavation and re-profiling of the granite bedrock on site, several alternative retaining wall solutions were investigated at a concept design level. A number of the options are innovative in that they have been successfully used in other geographical areas, but not as yet in Ireland. The most cost-effective wall option in combination with modifications made to the proposed dredging works has the ability to reduce construction costs by approximately 40%.

During the peer review exercise, ground risk was identified as a key driver for the choice of retaining wall. Following the concept design review, GDG was then commissioned to plan, specify, tender and administer a new intrusive site investigation campaign on the site comprising a total of 13 marine boreholes at various target depths. The site investigation works were carried out by Ground Investigations Ireland (GII) between August – December 2019. The geotechnical information is currently being reviewed and interpreted by GDG in order to inform DAFM on the geotechnical risks associated with respect to quay wall and dredging construction techniques.