Trevallyn Dam upgrade runs around the clock

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January 2016  | David Claridge

A COMPLEX PROJECT is to be undertaken at the Trevallyn Dam from January to March, as Hydro Tasmania plan to replace three large dewatering valves.

The valves, installed into the dam when it was built in the 1950’s have reached the end of their life and need to be replaced so that Hydro Tasmania can continue to safely release water and manage the level of Lake Trevallyn.

Project Manager Andrew Rumsby will be overseeing the project.

“The most critical decision was to undertake the work during summer. We recognise this is a popular time for recreation users and visitors but it is also when there is the lowest chance of high rainfall and spill,” Mr Rumsby said in a media release.

This project has been in the works for many months, Hydro Tasmania has consulted people who live near Trevallyn Dam, to better understand how their work may impact the locals and what can be done to minimise it.

“Users of the surrounding area may experience some inconvenience as a result of the work.

We will endeavour to minimise this wherever possible, but there will be some unavoidable impacts to ensure workers’ safety, and we apologise in advance for any inconvenience,” said Mr Rumsby.

“The safety of our people and the general public is a top priority and we have taken a number of actions to ensure their safety, and to protect the worksite during this project.

“We will be working around the clock so the project can be completed as quickly as possible, but will limit noisy activities to daytime hours.”

An impact on the flow through the Cataract Gorge is expected from mid-January to mid-February when the highest risk work is being undertaken. As a result, Lake Trevallyn will be below the normal summer level.

Hydro Tasmania recognises this is a busy period for visitors to Cataract Gorge downstream from the dam.

As such, they will implement measures to ensure any flow stoppages avoid peak times when there will be the highest number of people enjoying the Gorge.

Information about the valve upgrade can be found on Hydro Tasmania’s website: www. hydro.com.au/energy/ upgrades-and-maintenance.