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Why were these maps produced and what do they show?

Hydro Tasmania created flood maps for the Huon Valley region as part of mandatory requirements set by the regulator, the Department of Natural Resources and Environment Tasmania. They show the worst-case scenario of flooding if the Edgar Dam was to fail suddenly and are part of standard emergency management preparations.

We shared the maps with the regulator in 2016 and with emergency services, Tasmania police, and the Huon Valley Council Emergency Management Committee.

Hydro Tasmania will be carrying out planned upgrade works for the Trevallyn Power Station intake during March and April 2026, focused on replacing the intake trash rack screens located at the lake intake near Trevallyn Dam.