Beales Reservoir Upgrade

PROJECT INFO

Client: Central Highlands Water

Project Design:

MWH

Contract SUM:

$1.6M

 

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ABOUT THE PROJECT

Beales Reservoir Upgrade

Beales Reservoir is an earthen dam immediately downstream of Wil­son’s Reservoir, and was constructed in 1863 with a capacity of 415 ML. The old dam was 419m long and up to 5.3 m high.
Beales and Wilsons Reservoirs, are an important part of Ballarat’s wa­ter supply, combined holding over 1 GL of water or 1/8 of the regions water supply.
Both of these dams also have post gold rush design features such as bluestone spillways and have been marked as historically significant.
Great care has been taken during the upgrade to ensure the preserva­tion of the Reservoir’s significant historical features including century old engineering practices seen in the existing bluestone spillway and channel.
To comply with ANCOLD’s 1 in 100,000 year flood requirements, Entra­con has been engaged to upgrade the spillway, outlet pipe ,earthen embankment including the installation of sand filters, addition of a full height berm to meet ANGOLD guidelines, new auxiliary spillways and improved site drainage.

Works Include:

• Chimney Filter / Drains with Weighting Buttress;
• Filter Cutoff Trench;
• Outlet Works Extension (Incl. Concrete Encasement);
• Outlet Works Discharge Structure;
• Cured-In-Place-Pipe (CIPP);
• Outlet Works Discharge Channel;
• Seepage Collection System;
• New Auxiliary Spillway (Incl. Cutoff & Riprap );
• Principal Spillway Upgrade;
• Crest Capping Material and
• Piezometer Extensions.
• Supply of all filter/ drainage materials required for the Works;
• Supply of all pipes, pits, fittings and other materials required for the Works;
• Construction survey set out utilising the survey provided by the Principal;
• Establishment and monitoring of temporary deformation monitoring survey points;
• Clearing & Grubbing within the footprint of the Works;
• Stripping & Stockpiling topsoil within the footprint of the Works;
• Foundation preparation;
• Construction of embankment swale drain;
• Erosion and sedimentation control;
• Topsoil replacement and site rehabilitation;

Key Aspects:

• Deep Excavation
• Tight time frame
• High project risk due to winter rain fall
• Tight material quality control