There is also a food warning along the middle Liffey as water flow increases at Pollaphuca Reservoir
Residents in the Kilganeyarea of Clonmel are being evacuated tonight as the local authority prepares for the River Suir to burst its banks.
Level 3 of the Clonmel Flood Response Plan has now been activated.
Families are being moved to the Clonmel Park Hotel as a gathering point while alternative accommodation is organised.
Ger Walsh of Tipperary County Council outlines what's been happening:
The ESB has increased the flow of water through the Pollaphuca Reservoir.
The power company says it's due to very heavy rainfall in the last number of weeks in the River Liffey catchment area.
As a result there's a warning of flooding in all areas of the middle Liffey, in particular Kilcullen, Clane, Newbridge, Straffan and Celbridge.
The ESB says they will continue to monitor the situation closely.