COMHAIRLE CONTAE ÁTHA CLIATH THEAS
SOUTH DUBLIN COUNTY COUNCIL

MEETING OF LUCAN/PALMERSTOWN/NORTH CLONDALKIN AREA COMMITTEE

Tuesday, June 29, 2021

MOTION NO. 25

MOTION: Councillor L. O'Toole

This committee requests that the Chief Executive provides a report on number of issues regarding flood, drain blockage etc that has been brought to council attention over the last 5 years. To advise if there is any evidence of an increase in same matter. Given the fact there there are plans to develop in areas around the Griffeen Park area concerns of any additional development in the area are given rise to potential problems further down the line.

REPORT:

We are aware of 1 report of flooding in the Griffeen catchment in the past 5 years.  This flooding was relatively minor with no property damage, and was where the river flooded riverside paths in the Griffeen Park area.  As part of the normal operation of the River Griffeen Flood Aleviation Scheme, flood flows are retained within the middle and upper catchment in ponds and green areas, which attenuates high flows preventing these from reaching the lower catchment where there is a greater risk to properties.

There has been no evidence of an increase in flooding in the Griffeen catchment over the past 5 years.  A flood alleviation scheme was constructed in this catchment circa 2004, ongoing monitoring and maintenance of surface water networks and watercourses in the catchment will continue to be effective in dealing with rainfall events.

All development in SDCC is conditioned to reduce surface water run-off to pre-development or green field run-off rates, ie Sustainable Drainage Systems (SuDS) are required with all developments.  Hence future developments should not increase flows to the Griffeen River.