River Dargle Flood Defence Scheme

historic slope stability issues required complex works for the success of this project

ByrneLooby were the geotechnical designers for this €28m flood defence scheme to protect over 650 homes and properties from flooding in Co. Wicklow.

The scheme involves the construction of flood defence walls, widening of the river channel over a 3km stretch as well as the increase of the flow capacity under Bray Bridge. Works were complex due to historic slope stability issues along the route and constraints on solutions due to the urban environment

We value engineered the specimen design of the concrete pile flood defence walls by optimising its efficiency along the route. Our geotechnical experience proved critical in enabling our client to react to changes in site conditions with innovative, value driven design solutions with minimum delay.

At Bray Bridge, we designed a 7.4m wide, 4m high and 6m deep culvert greatly augmenting the flow capacity under the bridge. 

Scope of Project

  • Design of flood alleviation measures including flood defence walls and a culvert for the River Dargle Flood Defence Scheme in Wicklow.
  • The culvert was 7.4m wide, 4m high and 6m deep and located immediately adjacent to the masonry Bray Bridge.
  • Extensive value engineering of the flood defence wall along the route to ensure cost effectiveness and in response to prevailing ground conditions.
  • While the project is set to last 2 years, works can only take place at certain times of the year due to the Wildlife and Fisheries Act.

Project Photos