The paper highlights the fundamental importance of correct data selection and storage for the quality of Asset Management demanded for today’s water industry infrastructure.
In developing this theme, the concept of Risk driven maintenance is introduced to focus attention on those issues that not only the identify the appropriate data to be collected and stored, but also, by way of illustrated examples, the direct relevance and application of reliability engineering principles in Risk Analysis.
The author’s principle objective is to demonstrate that the historical data on reliability, condition and performance must be supported with detailed costing information if any worthwhile outcomes are to be forthcoming from analysis.
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The disused Stapylton quarry is located in the suburbs of the Queensland Gold Coast. Gold Coast City Council, as part of the Northern Wastewater Strategy, has included the use of the quarry for storage and re-distribution of reclaimed water from the Beenleigh Water Reclamation Facility (WRF) to the downstream cane farmlands. A comprehensive EIS has been produced, which has strict water quality requirements for the quarry environs as well as the reservoir and outflow. This paper presents the background to the Northern Wastewater Strategy, the requirements for the Stapylton reservoir and the analysis performed for the detailed design of the embankment dam and the inlet bubble plume destratification system. The modelling of the destratification system was undertaken using the programme DYnamic REservoir Simulation Model (DYRESM) coupled with Computational Aquatic Ecosystems DYnamics Model (CAEDYM). The outcomes and implications of the modelling for the design and system operation including environmental monitoring are discussed.
Yarrawonga Weir was constructed in the 1930’s and is located on the Victoria / New South Wales border, between the towns of Yarrawonga and Mulwala. Dam safety investigations revealed that the main embankment was founded on a very loose layer of sand that would be vulnerable to liquefaction even under the operating basis earthquake
This paper details the statutory approvals and community consultation processes that were employed and the benefits that they provided to the $13 million remedial works project.
Local communities can assist, be neutral or obstruct a project. By engaging the community in a positive manner it is possible to deliver excellent results without increasing costs.
N. Vitharana, A. Gower, G. Bell and N. Petrovic
Churchman Brook Dam is a 26m high earthfill dam with a puddle clay core and impounds a reservoir of 2.2GL. Various remedial works have been undertaken since completion of construction in 1928. In September 2000, a sinkhole in the right abutment was observed during a routine dam inspection. Following this incident, detailed site investigations were carried out. These investigations revealed that there are soft zones and possibly voids formed in the upper part of the clay core.
A comprehensive dam safety study and a risk workshop undertaken in 2002/2003 showed the dam to be deficient in aspects associated with piping, spillway adequacy and outlet works condition. A rational geotechnical model was developed for the foundation utilising triaxial test data from 1980s and recent investigations. The existing spillway chute will be upgraded with a concrete liner attached to the existing chute incorporating no-fine concrete as a free-draining medium. This paper presents the various aspects of the remedial works currently being designed.
Suzie Gaynor, Jocelyn Potts, David Watson
State Water # as manager of Keepit Dam has established a comprehensive upgrade project.
A portfolio risk assessment by State Water of its major dams placed Keepit Dam as the highest priority for an upgrade.
While extreme flood and earthquake dam safety are the main drivesr for this upgrade, the opportunity has been taken to integrate other key dam management considerations into the process including environmental improvements, flood mitigation and sustainable regional development.
The dam, which is located on the Namoi River some 45km upstream of Gunnedah, is, in tandem with Split Rock Dam upstream, a vital irrigation water supply for the Namoi Valley region in northern New South Wales.
In considering the most appropriate way of addressing the critical flood safety issue, it became very apparent that the solutions were many and they significantly impacted on the local community. Other important issues such as water quality and flood mitigation, and overall sustainable development in the valley, particularly system water reliability, could influence dam safety solutions and so also needed to be considered as part of the process. As such it was considered imperative that the local community be actively involved in determining both interim and long-term upgrade solutions.
To achieve the best outcome for the region, State Water since mid 2001, has used the community consultation approach to guide the project.
Currently interim works have been completed and long-term options are being evaluated.
An Environmental Impact Statement on the preferred proposal will be undertaken during the later part of 2004 and if approved, all works will be completed by end of 2007.
This paper will highlight our experiences to date including: