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Dams Safety Committee Annual Report 2002/2003 Frontmatter Dams Safety Committee Annual Report 2002/2003 ANNUAL REPORT 1 NSW DAMS SAFETY COMMITTEE FLOOR 3, MACQUARIE TOWER 10 VALENTINE AVENUE PARRAMATTA NSW 2150 (PO BOX 3720 PARRAMATTA NSW 2124) FAX: (02) 9895 7354 OFFICE PHONE: (02) 9895 7363 EXECUTIVE ENGINEER: (02) 9895 7349 Website: http://www.damsafety.nsw.gov.au Email: [email protected] DX: 28360 BUSINESS AND SERVICE HOURS ARE NORMALLY 9.30 am TO 4.00 pm MONDAY TO FRIDAY Please note that the NSW Dams Safety Committee (DSC) only has a small number of technical staff who are often away from the office on dam inspections, etc. Accordingly, technical questions may not be able to be answered immediately, although every effort will be made to pass on messages to ensure a prompt response. Cover Picture: Warragamba Dam is a 113 m high concrete gravity dam which impounds the major water storage for Sydney. It was built in 1960, and upgraded in 2002 to meet new flood standards by the construction of an auxiliary spillway around the side of the dam. NOTE: The DSC has prepared 250 copies of this report for distribution to Parliament, relevant organizations, and the public, at a cost of $4,150 (i.e. $16.60 per copy). ISSN 0816-2727 2 ANNUAL REPORT The Hon. Craig Knowles, MP Floor 3, 10 Valentine Avenue Minister for Infrastructure and Planning PO Box 3720 and Minister for Natural Resources PARRAMATTA NSW 2150 Parliament House Phone: (02) 9895 7363 SYDNEY NSW 2000 Fax: (02) 9895 7354 In reply please quote: Our Ref: 10.102.007 Dear Mr Knowles, We have pleasure in submitting to you, for presentation to Parliament, the NSW Dams Safety Committee's Annual Report for the year ended 30th June 2003. This annual report has been prepared in accordance with the Annual Reports (Statutory Bodies) Act 1984 and the Annual Reports (Statutory Bodies) Regulation, 2000. Yours sincerely, Len McDonald Adrian Williams Chairman Deputy Chairman ANNUAL REPORT 3 Dams Safety Committee Annual Report 2002/2003 Frontmatter CONTENTS Overview by Chairman......................................5 6. Future Objectives .................................... 13 Our Objectives ............................................................ 5 6.1. Regulation of Dams Safety................................13 Targets........................................................................ 5 6.2. Regulation of Mining near Dams .......................14 Highlights .................................................................... 5 6.3. Administration and Information Systems ...........14 Our People.................................................................. 6 Our Stakeholders ........................................................ 6 7. Detailed Review of Operations............... 15 The Future................................................................... 6 7.1. Regulation of Dams Safety................................15 7.2. Regulation of Mining near Dams .......................25 1. Charter ........................................................7 7.3. Information Systems..........................................30 1.1. Why do we have a Dams Safety Committee (DSC) in NSW?................................................... 7 8. External Stakeholders............................. 31 1.2. What Legislation defines our Function?.............. 7 8.1. Liaison with Stakeholders..................................31 1.3. What is the Function of the DSC?....................... 7 8.2. Education and Training of Members and Staff ..32 2. Access.........................................................7 9. Administration and Human Resources ................................................ 33 3. Aims and Objectives..................................7 10. Finance ..................................................... 33 4. Management and Structure.......................8 10.1. Dams Safety Committee Certificate ..................33 4.1. Committee Members .......................................... 8 10.2. Auditor General’s Certificate..............................34 4.2. Committee Staff................................................ 10 10.3. Dams Safety Committee 2002/2003 – 4.3. Sub-committees................................................ 10 Budgetary Information .......................................39 4.4. Meetings ........................................................... 10 Appendix A – Dam Owner Summary 5. Summary Review of Operations.............11 30 June 2003 ........................... 39 5.1. Major Achievements for 2002/2003 .................. 11 5.2. Performance Indicators..................................... 11 Appendix B – 2003 Current Prescribed 5.3. Budget Highlights.............................................. 11 Dams in NSW ........................... 40 Index ................................................................. 44 MAP OF PRESCRIBED DAMS Centre pull-out Section LIST OF TABLES Table 1 - Budget Highlights.............................11 Table 5 - Status of Dams with Significant Safety Risks.....................................20 Table 2 - DSC Performance Indicators...........12 Table 6 - Information Sheets for Mining Table 3 - Information Sheets for Dams near Dams .......................................26 Safety...............................................15 Table 7 - Mining Approval Summary ..............28 Table 4 - Dams Upgraded...............................19 Table 8 - Monitored Approved Mining 2002/2003........................................30 4 ANNUAL REPORT Frontmatter Dams Safety Committee Annual Report 2002/2003 Overview by Chairman Our Objectives The NSW Dams Safety Committee’s (DSC’s) mission is to develop and implement policies and procedures for: • for effective dams safety management; and • for regulation of mining that affects dams or stored waters. The DSC takes into account the Australian National Committee on Large Dams (ANCOLD) guidelines and relevant international practices in deciding on tolerable risks from dams. A dam is classified as safe if it meets the Committee’s requirements. The DSC expects that public consultation will be part of the approval process for any safety decision where dam failure could result in loss of life. That no prescribed dam has failed does not demonstrate an adequate dam safety management program. International experience has shown the need for systematic programs, involving consequence rating, responsible operations, maintenance and emergency preparedness practices, regular surveillance reporting, periodic safety reviews and implementation of necessary risk reduction measures. The DSC has structured the dam safety program for NSW in line with the ANCOLD Guidelines on Dam Safety Management, now under revision. In managing threats to the security of stored waters, or to dam structures, from mining under or near the reservoirs, there is not the same degree of guidance from international practice. Upon establishment of the DSC in the late 1970’s, a cautious approach was taken in regulating mining activity, based on the then existing scientific knowledge of the effects of mining. Careful monitoring of these effects was established, and, as knowledge and experience has been gained, the DSC has modified its requirements in order to allow the winning of more coal and mineral resources. The result has been significant economic benefit to the State, whilst maintaining the security of stored waters and the safety of the dams. Targets The DSC has adopted the targets given in Sub-section 5.2, Table 2, of this report. Attention is drawn to the key targets requiring that there be programs, approved by the DSC, for reducing risks to tolerable levels on dams identified as having significant deficiencies, that the DSC monitor progress against the program, and that it follow up in a timely manner. Identification of deficiencies and implementation of risk reduction measures for a dam usually requires a period of several years. The DSC must monitor progress, assist the process as needed, and be prompt in stating its requirements. Highlights Safety improvements were completed during the year on Rylstone, Tilba and Wentworth Falls Lake Dams. Wellington Dam was demolished, upgrading works commenced on Chichester Dam, and interim improvements were completed on Keepit Dam. Structural and earthquake safety improvements were completed on Hume Dam and investigations continued into the need for upgrading its flood capacity. The owners of these dams are to be commended for committing substantial funds to the safety improvement of their dams. A start was made in upgrading deficient Council dams, according to revised priorities identified in a portfolio risk assessment completed in 2002. Significant progress was made with planning of the risk reduction measures for other dams, as detailed in the report. There were no damaging earthquakes in NSW during the year. The only significant dam safety incident was when a severe flash flood at Redbank Creek Dam in February 2003. However, the dam had been kept empty to ensure the safety of downstream residents pending safety improvements and the flood was contained within the dam with releases through its outlet. The DSC continued with its review of safety policies, with a view to adoption of less conservative standards for some dams and to the introduction some elements of risk assessment into its dam safety management procedures. As part of this review process, drafts of a number of revised technical information sheets were posted on the DSC web site for a period, in order to provide an opportunity for industry and public comment, prior to
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