• Cllr Brian Dennehy

Flooding Lower Channel Road, Rush

COMHAIRLE CONTAE FHINE GALL

FINGAL COUNTY COUNCIL

BALBRIGGAN/SWORDS AREA COMMITTEE MEETING

[Services A – Operational Matters]

Thursday, 14th May 2015

ITEM NO. 84

Flooding Lower Channel Road, Rush

Motion: Councillor B. Dennehy:

"This Committee calls on the Chief Executive to address the fluvial flooding issues on

Lower Channel Road in Rush by initiating an upgrade of the existing Storm Drain

pipe in the area, the capacity of which is inadequate to address the needs of the

area, also ensuring that the necessary pipe work is installed to adequately address

the growing volumes of surface water runoff from increased levels of rainfall due to

Climate Change, and that funding be sought as a matter of urgency to eliminate the

issue of flooding to homes in the area."

Report:

Fingal County Council along with Meath County Council and the Office of Public

Works recognised the existence of flood risk in the Fingal East Meath area. To

address this issue, the Fingal East Meath Flood Risk Assessment and Management

Study (FEM FRAMS), a catchment-based flood risk assessment and management

study of nineteen rivers and streams, and their catchments, along with the coastal

areas of Meath and Fingal, has been carried out.

Included in the assessment was the coastal area and the Rush West Stream in Rush.

The flood extent mapping produced shows flooding for the 0.1% Annual Exceedance

Probability (AEP) event or 1/100 event to lands and properties along the south

eastern end of Channel Road.

As part of the assessment the FEMFRAM study outlined possible options for the

solution to the flooding. At this location the FEMFRAMs options report determined

that the construction of a new 525mm diameter surface water drain parallel to the

existing culvert on the downstream end of the Rush West Stream would provide the

conveyance capacity required for the 0.1% AEP event.

This option would require the construction of approximately 250m of culvert at an

estimated cost of €600,000. This would improve the conveyance of fluvial waters in

the area, provide protection to the 25 residential properties and 2 non-residential

properties affected by fluvial flooding in the vicinity of Channel Road. This option

would not provide protection for the 17 residential properties at risk from coastal

flooding.

In order to be considered for OPW funding the benefit cost ratio (BCR) must be

greater than 1. In the case of the flood relief option outlined above, the BCR was

0.74. The FEMFRAM study did not recommend works to the culvert at this location,


which means that the OPW will not provide funding for this option. The Draft Final

Report advised that further analysis would be required to determine if a positive BCR

can be found.

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