Awoonga Dam is located near the town of Gladstone in central Queensland. The dam is on the Boyne River, and supplies water for domestic and industrial use in the Gladstone area. It is also used for recreation including swimming, boating, fishing, sailing and water skiing.
Awoonga Dam was completed in 1984. It has a storage capacity of 289,000Ml, and a submerged area of 3,450ha. The dominant land use in the catchment area is open grazing and includes the Mount Castle Tower National Park. A limestone quarry is also adjacent to the reservoir
The Gladstone Area Water Board (GAWB) own and operate Awoonga Dam. In 1999, the decision was made to raise the existing structure using a staged construction program.
Included in the first stage was the protection of a limestone quarry, which is operated by Frost Enterprises Pty Ltd, and is adjacent to the reservoir. The quarry would be partially inundated unless some form of protection was provided.
This paper provides an outline of the investigation undertaken, the options considered and the solution provided to protect the quarry, hereafter referred to as Frost Quarry.
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Following the construction of the Snowy Mountains Hydro-Electric Scheme, flows in the Snowy River have been reduced to 1% of their original level at Lake Jindabyne. The Victorian, NSW and Commonwealth Governments have agreed to restore 212 gigalitres per annum (about 21% flows) to the river over a ten-year period and 28% in the longer term. The increased flows will be sourced primarily through water savings projects in Northern Victoria and NSW. This is a case study in learning how to share our precious water resources between environmental, social and economic needs.
N. Vitharana, G. Bell, J. Jensen and J. Sinha
When the storage was enlarged in 1971, Wyangala Dam provided a storage of 1220Gl. The original concrete gravity dam was completed in 1936 with an initial storage of 37.5Gl. The enlargement comprised the construction of a central core earth and rockfill dam utilising the existing concrete gravity as an upstream “toe” dam. At its deepest section, the toe (concrete gravity) dam is 60m high with a base length of 40m. The rockfill dam is 85m and the full supply level is at 75m. Two cylindrical reinforced concrete intake towers were constructed utilising the crest of the toe dam as their bases.
Screening level analyses commissioned by The NSW Department of Land and Water Conservation have recommended that detailed seismic assessment of the toe dam and intake towers be undertaken. In 2001, GHD Pty Ltd undertook inelastic time-history analysis using site-specific seismic loadings. Toe dam was modelled together with the rockfill dam using a 2-dimensional model. Intake towers were modelled incorporating the composite behaviour of concrete and reinforcing steel with limited concrete strains to prevent the loss of cover concrete and the buckling of longitudinal steel. Time-history analyses supplements by conventional pseudo-dynamic analysis procedures.
This paper described the constitutive modelling, structural analysis criteria, evaluation of hydrodynamic and dynamic earth pressures and the findings.
Bob Wark, Colin Bradbury, Michael Somerford and Michelle Rhodes
The Harvey Dam project is a major component of the Water Corporation’s Stirling-Harvey Redevelopment Scheme, which was developed to provide potable water to Perth. The scheme will deliver 34 GL/annum or about 10% of Perth’s supply. The project timetable was tight. The decision to proceed with the scheme, made in June 1998, required Harvey Dam to be ready to impound water by June 2002.
Construction of the Harvey Dam was complicated by the following:
These and other issues required the development of risk management strategies for the project. The construction risks were allocated within the contract to provide for an equitable sharing of risk between the Contractor and the Principal. The paper describes the development and implementation of the risk management strategies and what lessons have been learnt from the process.
Chas Keys and Steve Opper
As the legislated ‘combat agency’ for dealing with floods, the NSW State Emergency Service has had considerable experience in planning for flooding on the state’s rivers and in developing arrangements to help keep people safe when floods occur. This experience has been put to use over the past decade in the particular context of managing floods caused or exacerbated by dam failure. Some of the complexities of the dam-failure planning problem are explored in this paper, specifically as they relate to warning and evacuation tasks and to the issue of preparing communities for the extreme flooding which dam failure can be expected to cause. The points are made that warning is not just about mechanical alerting devices, evacuation is not restricted to commanding people to move, and public education requires a sensitive comprehension of the problems of disseminating information about rare and difficult-to-believe events.
Russell Hawken, Peter Buchanan, Doug Connors, Bill Hakin
Dartmouth Regulating Dam is located on the Mitta Mitta River, approximately 8 km downstream of
Dartmouth Dam. The dam is a 23 m high concrete gravity structure with a 60 m long central spillway
section. The dam forms the storage required for regulating releases from the Dartmouth Power
Station back to the Mitta Mitta River, so as to satisfy environmental requirements. Dartmouth
Regulating Dam and Power Station are owned and operated by Southern Hydro Limited, the largest
hydropower generator in Victoria.
To allow greater flexibility in their generation and hence a better response to the peaks in electricity
demand, Southern Hydro investigated the possibility of increasing the full supply level of the dam.
After an initial assessment of the economic benefits a detailed review of raising options was
undertaken, including different proprietary products and conventional spillway gates. Following this
review it was concluded that the Hydroplus System would provide the greatest benefits when all
aspects of the raising were considered, including dam safety, long term reliability, maintenance and
This paper discusses the reasons for the raising of the full supply level, the approvals process
undertaken and the technical issues addressed during the design stage, including the required
modifications to the dam and the appropriate sizing of the Hydroplus Fusegates.