Three different warnings by the ESB on the day before floods in Cork each significantly underestimated the amount of water that the company would be releasing through its dam at Inniscarra.
A report by Cork City Council says that the amount of water released through the dam on 19 November was double what the ESB had warned it would be just over twelve hours beforehand.
Almost half of Cork city's 40,000 households, mainly on the northside, were without clean water for a number of days after the floods.
18,000 houses on the northside were without water because of damage to a pumping station on the Lee Road.
The damage due to the floods is expected to run into millions of euro.
Meanwhile, over 500 people have attended a public meeting in Ballinasloe, Co Galway, tonight to discuss how the town can bounce back from the recent devastating floods.
It heard calls for a commitment from Government for funding to build flood protection for towns affected.
There were also calls for a single body to take charge of inland waterways.
A number of speakers urged the community to use the floods as a catalyst to revitalise the town, and called for job creation to be prioritised.
It was also suggested that parking charges in the town should be abolished or reduced in order to entice shoppers into the town centre in the run-up to Christmas.
