The design of the scheme brought together several specialist engineering disciplines within ROD to ensure that the highest ecological and environmental standards were achieved.
Summary
Roughan & O’Donovan (ROD) brought this flood defence scheme from feasibility and conceptual design, through planning and detailed design, to construction.
We also undertook the role of PSDP for the scheme.
Solution
Roughan & O'Donovan was commissioned by Dún Laoghaire-Rathdown County Council (DLRCC) and Transport Infrastructure Ireland (TII) to examine the cause of severe flooding on the M11 motorway in 2013 and undertake an assessment of the wider catchment of the Crinken Stream.
We used the Infoworks RS modelling package to undertake a detailed hydrologic and hydraulic analysis of the catchment.
Flood defence measures included:
- 1.6km of flood relief culvert along Old Connaught Road
- An upgrade of 2km of longitudinal motorway drainage
- New culverts
- Channel widening with flood bunds
Challenges
The works took place in a highly urbanised environment with heavily trafficked roads and, as such, significant traffic management measures were required.
Extensive consultation with affected landowners proved necessary as the flood alleviation measures involved works on private property.
Services provided:
- Hydraulic assessment and modelling
- Feasibility and conceptual design
- Options study
- Preliminary and detailed design
- Statutory and legal services
- Environmental assessment
- Contract documents
- Construction supervision
- Project management
- PSDP
