Due to heavy rain in the Trevallyn catchment over the past 48 hours Hydro Tasmania is forecasting Lake Trevallyn to go on spill in the next 12 hours.

In preparation for this Hydro Tasmania will be releasing 12 cubic metres per second down Cataract Gorge as a pre-emptive spill to warn the general public that an uncontrolled discharge event will be occurring in the next 12 hours.

Initial indicators suggest this will be a significant spill event.