Mikany Dam Upgrade

What's this project all about? 

Mikany Dam is located six kilometres south-east of Smithton in the state’s north west. It is referred to by local residents as Lake Mikany.

The dam was originally built in 1972 and has two main embankments, as well as a smaller embankment which provides access to an island in the centre of the lake. The dam is gravity-fed from Deep Creek and Muckeye Creek catchments and is the primary source of potable water for Smithton, Stanley and Irishtown. Water is supplied to these towns via Deep Creek to an off-take downstream, where it is pumped to a treatment plant at Smithton prior to distribution. 

TasWater identified a need for upgrades to meet improving Dam Safety standards and associated Australian National Committee on Large Dams (ANCOLD) guidelines. As a result, a substantial investment is required to reduce the risk the dam poses, while also providing a sustainable water supply for customers.

 

The major features of this upgrade include:

  • Increasing the strength of both embankments by constructing filter and rock-fill berms
  • A small increase in the height of the dam wall to provide protection in the event of an extreme significant flood
  • The result of the upgrade will be a dam which meets modern standards, is safe, improves water security, and can provide flood protection for much larger floods.

 

 

Project updates

July 2022

Installation of a V-notch box at the toe of each embankment
Installation of stairway works on Embankment A. Manufacturing of galvanised steel stairway, installation of stairway footings, installation of concrete stairs from intake tower
Instrumentation and Electrical

June 2022

Strength of the embankments have been bolstered by installing sand filters within the wall and increasing the dam wall height by approximately one metre. This will provide greater protection against piping internal erosion within the dam wall, mitigate against a potentially liquefiable foundation, which is a phenomenon that can occur as a result of seismic activity and improve the dam wall’s overall stability.

May 2022

TasWater facilitated a visit with Circular Head Council on 3 May 2022, so they could inspect the works and progress of the dam which are vital to their region’s water supply prior to its completion.

Project timeline

This phase of safety upgrade has been completed and project commissioned September 2022.

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