1,000 Dublin properties flooded in October

Thursday 15 December 2011 23.27
Dublin was hit by severe flooding in October
Dublin was hit by severe flooding in October

Over 1,000 properties were flooded in the Dublin city area during last October's ''Monster Rain'' event, according to a council report.

The floods - which resulted in the deaths of two people - affected mainly the city, south Dublin and Wicklow.

In the city area 1,008 properties were flooded, there were also 318 "significant" road floodings and "several thousand" reports of minor road flooding.

The council report for the Environment Committee says that the OPW are to report on the possibility of works on the Camac river, which caused flooding in Kilmainham, and the Poddle river which hit Crumlin.

It says central funding will be requested to deal with underground rivers such as the Swan which caused flooding in Ballsbridge, the River Bradogue in Cabra and the River Naniken in Raheny.

The report points out that there are no problems with the Tolka and lower reaches of the Dodder rivers, where works have been completed.

The council says community action through Flood Resilience Groups is the best way to identify and deal with flooding problems.

The report states that up to 90mm of rain fell during the six hours on the evening of 24 October - that is more than four times the level associated with the country's heaviest rainfall.

It stated that the drainage system was overwhelmed and gullies could not be cleared until waters subsided.

"The evidence of this could be seen by the number of manhole covers which were lifted from their frames under the pressure of water from underneath.

''The sheer volume of rainwater falling on paved areas swept all debris including leaves into the roadways and in turn into the gullies", according to assistant city manager Seamus Lyons.

The report also states that sandbags are effective only when put at strategic locations and cannot be distributed to individual households or businesses.

The report also admits that there was a half hour delay in closing two flood gates on the River Dodder because staff could not find the keys.