A temporary flood relief solution at Lough Funshinagh in Co Roscommon has been given the planning go-ahead by An Bord Pleanála.
The planning application was lodged last September by Roscommon County Council.
The relief works will see water removed from Lough Funshinagh by a temporary pipeline and discharged into the local Cross River.
The interim measures are being put in place until permanent measures to manage the flood risk in the area are completed.
A number of conditions are attached to the planning application.
The lake in south Roscommon expanded to an unprecedented level last winter. It resulted in some homes being evacuated and many others requiring the continuous use of industrial pumps in order to stay dry.
Taoiseach Simon Harris has welcomed the decision.
"I have met with a number of residents who have been affected by the flooding at Lough Funshinagh and saw first-hand the situation homeowners were dealing with," he said.
"I want to thank OPW Minister Kieran O'Donnell, his Officials and Roscommon County Council for driving forward in finding a solution for the families involved," he added.
Director of Services with Roscommon County Council Mark Keaveney said the decision paves the way for the local authority to provide much-needed relief to properties affected by flooding in the vicinity.
He acknowledged the support and commitment of all those who worked on the application and said the council will continue to work towards an application for the permanent solution to address the many challenges surrounding Lough Funshinagh.
The permanent solution involves the installation of a 3km underground overflow pipeline from Lough Funshinagh to the River Shannon.
