Fred Haigh Dam flood repairs

Fred Haigh Dam Flood Repairs

Fred Haigh Dam, Approximately 22 kilometres from Gin Gin

Sunwater has undertaken works at Fred Haigh Dam, near Gin Gin, to repair scour damage from previous flood events.

The Project

Sunwater has completed works at Fred Haigh Dam, near Gin Gin, to repair scour damage from previous flood events which was caused by the energy impact of floodwater on the natural spillway channel.

The works aimed to repair downstream scour damage, undertake preventative protection works and ensure the dam continues to function as designed.

What was involved?

The repair work was carried out in two stages.

Stage 1A was completed in 2019 and involved:

  • installing anchors within the natural spillway channel adjacent to the spillway chute
  • filling scour holes with reinforced concrete to reduce the possibility of further scour
  • grading filled scour areas within the spillway channel to match the natural slope of channel
  • earthworks to clear debris in the river channel and to reduce water pooling next to the dam embankment wall.

Stage 1B was completed in January 2021 and involved:

  • installing a mass concrete slab across a section of the spillway channel, immediately downstream of the spillway chute
  • installing anchors immediately downstream of the spillway to provide reinforcement for the concrete slab that will be poured.

Location

Fred Haigh Dam, Queensland
Approximately 22 kilometres from Gin Gin

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Image 1: Earthworks in the downstream river channel to improve drainage and water ponding at the dam embankment .

Image 2: The area immediately downstream of the spillway where scour areas have been filled to better match the natural slope of the channel
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Image 3: The mass concrete slab below the main spillway.