Villagers in the nearby area of Pennal were evacuated yesterday when the breach was discovered. According to news reports, a drainage channel at the dam had been blocked by a landslide, leading to a build up of water in the reservoir. Emergency services and the landowner created a new permanent channel to drain water and release pressure.

The reservoir is the result of a build up of water at a disused quarry, with the dam formed of natural waste slate.

There has been major flooding in parts of Mid and West Wales over the past few days, with rivers bursting their banks. More than a months worth of rain fell in just one day in some areas. A number of flood alerts still remain in force and a clean up operation is underway.