1998 – Changes in the ECNZ Dam Safety Assurance Programme

Categories: 1998, Papers Tags: 1998, ECNZ, ECNZ Dam Safety Assurance Programme, Murray Gillon

Murray Gillon

As New Zealand’s largest dam owner, ECNZ has actively managed dam safety since its inception in 1987. During this time it has managed several major dam safety issues and enhanced its dam safety management practices. This has occurred in an environment of organisational change and increasingly competitive commercial pressures.

The change in emphasis from a primarily technical emphasis to dam safety towards a commercial focus is described together with details of highly rated dam surveillance system, some continuous improvement initiatives, and recent enhancements to the dam safety programme. The position of responsible ownership in regard to risk and legal requirements is also discussed.

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1998 – Matahima Dam Strengthening Project Management Design, Consents and Construction
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Steve Everitt, Ron Fleming, Lelio Mejia

The Electricity Corporation of New Zealand Ltd (ECNZ) is strengthening its Matahina Dam which is an 80 m high, 400 m long rockfill dam impounding a 60 million cubic metre reservoir. The strengthening is to ensure the dam will withstand potential fault displacement within the dam foundation.

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1998 – From Dam Owners to Water Managers – The Victorian Experience
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I A Howley, G S Smith and D J A Stewart

Over the past decade the role of dam ownership in Victoria, and indeed Australia, has changed from one of owners, constructors and operators of large civil assets, to managers of structures on behalf of owners of the entitlements to water. This is part of the key business focus to dams management in Victoria.

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1998 – Risk Assessment – Estimating the Probability of Failure Embankment Dams by Piping
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Mark Foster, Robin Fell and Matt Spannagle

This paper describes a method for estimating the probability of failure of embankment dams by piping. The so called “UNSW method” is based on the results of an analysis of historic failures and accidents of embankment dams. An estimate of the probability of failure of a dam by piping is made by adjusting the historical rates of failure by piping by applying weighting factors which take into account the dam zoning; filters; age of the dam; core soil types; compaction; foundation geology; dam performance; and monitoring and surveillance. The method is intended for preliminary assessments only and is ideally suited as a risk ranking method for portfolio type risk assessments to identify which dams to prioritise for more detailed studies and as a check on event tree methods.
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1998 – Hume Dam: The Dam Owner and the Community 1995 – 1997 – A Retrospective View
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