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Project : BETHUNGRA DAM

Civil Engineering
Dams
  Estimated Project Value
$ 2,881,000
Address .
Suburb Bethungra
State NSW
Council Junee
Postcode 2590
Project Type Dam - Safety Upgrade
Development Type New
Status Firm
Stage Contract Let
Ownership State
Notes
Contract Let Work To Commence Early May 2016 (Dtiris 14/185-2)
Commence Date 2/5/2016
Completion Date 3/11/2016
Details
  • Bethungra dam stabilisation.
  • Buttressing the concrete dam wall with rockfill & construction of a gabion lined overflow spillway to handle flood inflows.
  • Scope of work includes: removal & lawful disposal of any plants, trees & materials that may cause hindrance to construction within a 10m footprint of the rockfill buttress toe and stilling basin, including cut batters.
  • Construction of a temporary access track to the left abutment and the crest of the dam to provide access for construction; maintain the roads (both existing & constructed) throughout the life of the project.
  • Construct a temporary diversion (e.g pumping or siphoning etc) for use in drawdown of the reservoir & for flood diversion around the works area during construction.
  • Lowering of the reservoir to enable safe construction of the works and to limit the risk of flooding during construction.
  • Construct temporary fencing for safety of livestock in reserve foreshores & maintain water supply for the stock during draw down of reservoir water level.
  • Excavation downstream of the dam to provide a suitable foundation for placement of the rockfill buttress.
  • Winning, screening and possibly crushing rock sourced from the existing spoil emplacement area at the Bethungra Spiral, stockpiling in required gradings, testing & haulage to the dam for temporary stockpiling or direct placement into the rockfill buttress.
  • Construction of the rockfill buttress on the downstream side of the existing dam.
  • Construction of a gabion lined spillway over the rockfill buttress to safely convey overtopping flows to the stilling basin.
  • Anchoring the gabions at the downstream toe of the dam into the foundation.
  • Excavation of a stilling basin downstream of the rockfill buttress.
  • Lining the stilling basin perimeter with gabions.
  • Excavating a portion of the existing concrete dam crest non-overflow abutment (11m wide) down to the existing spillway sill level.
  • Raising a portion of the existing spillway (54m wide) on the left hand side will be raised up to the non-overflow dam crest level by filling with concrete.
  • Construction of a small concrete kerb/nib wall (0.31m high by 0.2m wide) on the upstream crest of the non-overflow section of the dam (existing and raised sections).
  • Decommissioning of the existing nonoperable outlet works by concrete encasing the existing valves, removal of the winch from dam crest & removal of any pipework within the rockfill buttress footprint.
  • Construction of a man-proof fence around the perimeter of the dam (including the rockfill buttress & stilling basin).
  • Decommissioning & removal of existing dam instrumentation on the dam crest.
  • Demolition of the concrete weir structure at the dam toe.
  • Placement of excess spoil from the excavation for the buttress foundation on the upstream left abutment & revegetating.
  • Potential placement of fill in the Bethungra Dam Reserve Area.
  • Landscape the disturbed areas of the bank.
  • Reinstate private property such as fencing removed in order to carry out the works.
  • Restore all private property damaged as a result of the works to its pre-construction condition; this may include the provision of fill material or topsoil & turf to restore the height of the levee.
 
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