B. A. Cole
In October 2000 ANCOLD published a history of dam technology in Australia covering the 150 years in which large dams have been constructed in this country. The paper describes how this project began, the search for authors, the way the authors tackled their tasks, the peer reviews which resulted in additional chapters being written, and the archive searches for interesting photographs to illustrate the text. All this was accomplished by dam engineers including the editor. Then follows an account of the professional publication process: sub-editing, desktop publishing, proof-reading, the preparation of an index, the cover design and the printing process. Some conclusions are drawn from this first experience of book publishing.
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Murray Thompson and Geoff Chenhall
The Hastings District Water Supply Augmentation Scheme [HDWS] includes a 10GL off-creek storage dam, which is currently under construction and due for completion in October 2001. The Cowarra off-creek storage dam is required to meet predicted long-term urban growth demands for water supply and to ensure protection of environmental flows in the Hastings River.
Since 1985 the Hastings Council has progressively developed a strategy for the augmentation of the water supply scheme. A very successful ongoing consultation process with both the local community and key government agencies during the planning and implementation phases of this project has highlighted a number of key issues including:
“That the impact upon aquatic flora and fauna in the Hastings River should be minimised and appropriate safeguards developed by maintaining minimum river flows to ensure that the river habitat is not adversely affected”
The subsequent HDWS Environmental Impact Statement, 1995 was one of the first in NSW to recognise the importance of environmental river flows in the assessment of the aquatic ecological effects of water supply schemes. This paper to be presented to the ANCOLD Conference on Dams will detail the investigation, planning, implementation and current construction activities associated with the Cowarra Off-Creek Storage Dam.
M. B. Barker, R.M. Holroyde, J Williams and T. Qiu
Grahamstown Dam is a major water supply source for the Newcastle area and it is proposed to raise the full supply level by 2.4m from RL 10.4m to RL 12.8m. The present spillway is inadequate to pass the PMF without overtopping of the existing embankments at the new FSL and part of the raising comprises construction of a new embankment of about 10m high with a right bank spillway upstream of the existing spillway capable of passing the PMF. The Pacific Highway is located some 600m downstream of the new spillway and a 60m wide culvert below the Pacific Highway is being constructed with capacity sufficient to pass the PMF. Significant changes were made to the feasibility design for the spillway and the Pacific Highway culvert using a labyrinth spillway and a baffle chute energy dissipator respectively. Both of these designs are uncommon and the process of finalising the designs as well as some of the problems in the use of a labyrinth spillway and the cost savings realised in the use of these designs are presented.
Robert Wark, Nihal Vitharana and Michael Somerford
This paper reviews the history of dam remedial works on publicly-owned dams in Western Australia over the last 40 years. Projects have ranged from refurbishment of the facilities, through capacity upgrades to complete reconstruction. Major work has been undertaken on at least thirty dams. Most of these dams are now owned by Western Australia’s Water Corporation. The Corporation continues to undertake remedial works where necessary and now has a strategy in place for an on-going program of remedial works.
The paper outlines the scope of the work undertaken and why the work was required. The current status of the Corporation’s planning for an on-going remedial works program is also reported.
A.J. Crichton, A.W. Ford, and J.T. Williams
Developments in finite element analysis software are allowing more scope for their use in the stability review of Australia’s ageing dam population. Until recently, model simulation of structural discontinuities were outside the scope of routine dam safety assessment. Current state of the art finite element software puts complex joint modelling tools within the reach of the practicing dam engineer.
This paper describes the use of non-linear finite element techniques to assess the structural adequacy of the Julius Dam, a 26.5 m high multiple arch buttress dam in North-western Queensland. This structure impounds 127,000 ML behind its 399 m crest length for the Mt Isa water supply. The assessment of the structural adequacy included using non linear contact elements to model the sliding between adjacent arch barrels. Contact elements are able to simulate friction on an interface by allowing force transfer by friction under compression with no tensile strength. This tool is invaluable for assessing formed joints or defects within existing structures, as is demonstrated in the paper.
The Victorian Water Industry Seismic Network was substantially upgraded in 1999. This paper will look at the design and outcomes of the seismic network from a risk management and emergency management perspective. Funding issues for a diversified network providing benefits to a range of clients within the one industry group will also be discussed.
Prior to 1999 the Victorian seismic network had been developed on an ad hoc basis resulting in an incomplete level of seismic coverage throughout the state. The upgraded network now provides sufficient coverage to provide an intensity based alarm service for all contributing Victorian Water Authorities.
Community expectations of essential service providers such as the water industry are that they will carry out their own risk management to provide for service continuity and sustainability and that they will contribute to emergency management processes because it is in their own best interest to do so.
The risk management model looks at creating resilient communities through planning for the four R’s. Reduction, Readiness, Response and Recovery. The Seismology Research Centre’s Earthquake Preparation Alarm and Response system (EPAR) deals with the four R’s in relation to seismic hazard.
The EPAR system contributes to the risk management processes of identifying risks and vulnerability’s; potential consequences; and mitigation opportunities. The EPAR system additionally contributes to the emergency management processes of crisis response, impact assessment and recovery.