Liawenee Canal Upgrade
The $1.1m Liawenee Canal Upgrade comprised of four distinct sites spanning a total of 10 kilometres. The Canal's performance was hindered by its general deteriorated state and isolated obstructions to the water flow.
Works commenced in late January and were completed in late March 2007. The client's requirements were that Hazell Bros achieve two primary objectives:
- Reduce the risk of the canal failing
- Upgrade the canal's capacity such that it could safely pass its maximum design flow
Special considerations included a heritage listed stone wall and several rare and endangered species of flora and fauna.
Scope of Works
- Removal and disposal of the left hand side of the weir and construction of a new low-flow weir at this location
- Reshaping of the canal banks upstream and downstream of the weir
- Installation of erosion protection, grouted rock and riprap
- Raising of the abutments and training levee at the weir
- Excavation of 820m of existing canal invert (concrete and underlying rock)
- Disposal of excavated material
- Relining of lowered invert with reinforced concrete
- Supply of 50m3 crushed rock for erosion control purposes
- Removal of redundant bridge piers and abutments
- Disposal of waste materials
- Reinstatement of concrete invert and bank lining
- Demolition and disposal of existing rock crests
- Construction of new raised concrete crests for spillways
- Construction of concrete support wall
- Upgrades to spillways
- Grooming of 9000m of unlined banks and invert of canal
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