1998 – Liability for Dam Performance by Owners, Design and Constructors
D. C. Green
The disaggregation of public water supply bodies in recent years has seen the functions of ownership, design and operation transferred to separate bodies. Consequently , issues of risk management associated with legal liability which previously could be ignored because all risks were absorbed in -house must now be faced and addressed in a more formal way.
This paper looks firstly at the general principles of legal liability for dam performance associated with construction and design, ownership of an existing dam and monitoring of its performance. Liability under several different areas of the law is discussed. Special issues associated with “design and construct” contracts are then highlighted, and warnings are given for project sponsors who control the letting of contracts and the briefing of consultants.
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1998 Papers
1998 – Risk Assessment of Dams – Future Directions for Victoria
Learn moreD.Watson, J.Adam
For several years risk management has been promoted by the Victorian Department of Natural Resources and Environment – Water Agencies as the key mechanism for the effective and efficient business management of dams. As part of an extensive water reform program, the Victorian Government announced in October 1997, a financial assistance package for the water industry which included funding for dam improvements covering a majority of large dam owners in the State. One of the conditions for receipt of these improvement funds was the need for each water authority to undertake a Business Risk Assessment of all significant and high hazard dams under its responsibility. This paper discusses the Business Risk Assessment document based on a framework developed by Water Agencies after consultation with the industry and expands on the following reasons why the document was produced:
- To stress the importance and value of risk assessment in managing dams and the major role it plays in business planning and understanding dam performance. Risk assessment is not an alternative to the traditional engineering or deterministic approach but an enhancement,
- To identify the minimum assessment required and examples of different approaches such as portfolio risk assessments,
- To provide preliminary reference risk criteria to assist water authorities to determine appropriate business performance requirements. This preliminary criteria was developed from considering likely (although subject to change) outcomes of the current revision of Australian National Committee on Large Dams (ANCOLD) 1994 Risk Assessment Guidelines and other guidelines involving risk aspects recently or being prepared,
- To indicate future reporting and actions expected over the five year duration of the package including project evaluations and further risk assessments,
- To assist with inputs into ANCOLD’s continuing development and revision of guidelines, and
- To provide a platform for development over the next 18 months of an appropriate regulatory framework for covering all referable dams in the State. Key considerations will included performance based requirements encompassing risk management concepts, appropriate drivers which promote duty of care and associated legal issues and liabilities.
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1998 Papers
1998 – Developments in Extreme Flood Estimation Techniques – Hume Dam: A Case Study
Learn moreJ. H. Green and P. I. Hill
Early Probable Maximum Flood (PMF) studies and spillway adequacy assessments for Hume Dam adopted the standards based approach of the time. Since then considerable work and thought has gone into the estimation of extreme floods – both the philosophy and the practice. These changes include the general change in emphasis away from a standards based approach and towards risk assessment; the move towards an AEP-neutral approach for the transformation of extreme rainfalls to extreme floods; and the redefinition of both the PMP and the PMF.
This paper details the effect these and other changes to extreme flood estimation techniques have had on the perceived adequacy of the Hume Dam spillway to pass extreme floods.
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1998 Papers
1998 – Initial Raising of Borumba Dam
Learn moreRA Geddes
Over the last 30 years, the demand for water storages in Queensland’s Mary’s River has grown significantly. As a result of this growth in demand it was decided to raise Borumba Dam, the major storage on the system, in two stages The first stage was to be approximately 2 metres in I997 and the 25 metre raising be required in about 2010.Borumba Dam was completed in 1964. It is a 43 metre high concrete faced dam with a 32 metre long on the left abutment. The first proposal for initial raising was to install a two metre high air-inflated rubber dam on top of the existing crest. However, it was determined that this method of raising presented a number of prob and a new solution was sought.
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1998 Papers
1998 – Safety of Meadowbank Dam Against Sliding Parameter Uncertainty
Learn moreRichard I Herweynen
For concrete gravity dams, when the foundation’s value of cohesion is low, it is very difficult to meet the sliding criteria proposed by ANCOLD. Low cohesion is generally associated with serious foundation defects. This was the case for Meadowbank Dam, with a foundation having persistent horizontal seams containing material of a clayey silt size classification. By adopting the ANCOLD strength reduction factors, it was found that a large number of ground anchors would be required to meet the ANCOLD sliding criteria. During original design, extensive laboratory and insitu testing was performed on the seam material. This paper proposes a methodology for arriving at less severe strength reduction factors based upon a statistical analysis of the strength parameters measured in the Meadowbank Dam foundation.
Additionally, a probabilistic approach using a Monte Carlo simulation is used to give further weight to this argument. This paper concludes that the probability of Meadowbank Dam failing due to sliding is very low and within acceptable limits.
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1998 Papers
1998 – Risk Assessment of Dams – Future Directions for Victoria
Learn moreDavid Watson and John Adem
For several years risk management has been promoted by the Victorian Department of Natural Resources and Environment – Water Agencies as the key mechanism for the effective and efficient business management of dams. As part of an extensive water reform program, the Victorian Government announced in October 1997, a financial assistance package for the water industry which included funding for dam improvements covering a majority of large dam owners in the State. One of the conditions for receipt of these improvement funds was the need for each water authority to undertake a Business Risk Assessment of all significant and high hazard dams under its responsibility.
This paper discusses the Business Risk Assessment document based on a framework developed by Water Agencies after consultation with the industry and expands on the following reasons why the document was produced:
- To stress the importance and value of risk assessment in managing dams and the major role it plays in business planning and understanding dam performance. Risk assessment is not an alternative to the traditional engineering or deterministic approach but an enhancement,
- To identify the minimum assessment required and examples of different approaches such as portfolio risk assessments,
- To provide preliminary reference risk criteria to assist water authorities to determine appropriate business performance requirements. This preliminary criteria was developed from considering likely (although subject to change) outcomes of the current revision of Australian National Committee on Large Dams (ANCOLD) 1994 Risk Assessment Guidelines and other guidelines involving risk aspects recently or being prepared,
- To indicate future reporting and actions expected over the five year duration of the package including project evaluations and further risk assessments,
- To assist with inputs into ANCOLD’s continuing development and revision of guidelines, and
- To provide a platform for development over the next 18 months of an appropriate regulatory framework for covering all referable dams in the State. Key considerations will included performance based requirements encompassing risk management concepts, appropriate drivers which promote duty of care and associated legal issues and liabilities.