Saturday 24 March 2018

Over 1,000 properties flooded in October’s ‘monster rain’ – report

MORE than 1,000 properties were flooded in last October’s ‘monster rain’ a council report reveals.

The floods which resulted in the deaths of two people – a nurse and a garda – hit the city, south Dublin and Wicklow areas hardest.

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 report for the Environment Committee of the council, said that the Office of Public Works is to report on the possibility of works on the Camac river which caused flooding in Kilmainham and the Poddle river which hit Crumlin.

Central funding is being sought to deal with underground rivers including the Swan which caused flooding in Ballsbridge, the River Bradogue in Cabra and the River Naniken in Raheny.

There were no flooding problems associated with the Tolka and lower reaches of the Dodder rivers, where works have been completed.

Community action through Flood Resilience Groups is the best way to identify and deal with flooding problems, the report said.

Up to 90mm of rainfall fell during the six hours on the evening of 24 October which is more than four times the level associated with the country's heaviest rainfall.

Drainage systems were 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" said assistant city manager Seamus Lyons.

Sandbags are effective when placed at strategic locations but could not be distributed to individual households or businesses, the report said.

There was a half hour delay in closing two flood gates on the River Dodder because staff could not find the keys.

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