世界发展银行-Good-Practice-Note-on-Dam-Safety_83页_3mb

Summary of the Good Practice Note on Dam Safety (October 2020)

Core Content

This Good Practice Note (GPN) on Dam Safety provides guidance to World Bank staff on the application of dam safety requirements under the Environmental and Social Framework (ESF), particularly ESS4: Community Health and Safety and its Annex 1 on the Safety of Dams. The GPN emphasizes the use of a risk-management approach to ensure the safety of dams, whether new or existing, and supports the implementation of the ESF by offering practical tools and procedures.

Main Viewpoints

• Integration of Knowledge and Practice: The GPN is part of a series of documents developed in partnership with internal and external specialists to enhance the quality of practice without introducing new compliance requirements.
• Risk-Informed Decision Making: The note advocates for a risk-informed approach to dam safety, which considers the likelihood and severity of potential consequences from dam failure or misoperation.
• Comprehensive Risk Assessment: It outlines qualitative and quantitative risk analysis tools to evaluate dam performance and potential failure modes, enabling informed decision-making.
• Procedural Guidance: The GPN provides detailed guidance on project preparation and implementation stages, including the development of dam safety plans, prequalification of bidders, and the role of technical assistance.
• Collaboration and Support: It highlights the importance of coordination among Task Teams, Environmental and Social Specialists, and Dam Safety Specialists from the early stages of project development.
• Regulatory and Institutional Context: The note emphasizes the need for institutional capacity and regulatory frameworks to ensure the effective implementation of dam safety measures.

Key Information

1. Environmental and Social Framework (ESF) and ESS4

• ESS4 mandates that the Borrower must provide sufficient resources to apply the dam safety requirements outlined in Annex 1.
• The GPN complements ESS4 and is not a replacement for compliance with the ESF.

2. Scope of the GPN

• Applies to new dams, dams under construction (DUC), and existing dams.
• Covers construction, rehabilitation, and reliance on dams in projects not directly financed by the World Bank.
• Includes guidance for co-financed projects where the dam is not funded by the Bank but is part of the project or associated with it.

3. Risk Management Approach

• A systematic risk management approach is recommended for evaluating and mitigating dam-related risks.
• Includes risk classification, failure mode analysis, consequence assessment, and risk control and resilience enhancement strategies.

4. Risk Analysis Tools

• Qualitative and quantitative risk analysis are both used to assess potential dam failure scenarios.
• Tools such as Potential Failure Mode Analysis (PFMA), Failure Modes and Effects Analysis (FMEA), and Failure Modes, Effects, and Criticality Analysis (FMECA) are recommended.
• The Risk Index is introduced as a preliminary screening tool for dam portfolios.

5. Information Quality and Institutional Capacity

• Emphasizes the importance of accurate and reliable data for effective risk analysis.
• Highlights the need for institutional capacity building to support dam safety management.

6. Application to World Bank Operations

• Provides general guidance and essential tools for project teams.
• Includes risk classification diagrams for new and existing dams.
• Offers guidance on risk assessment levels and tools for different risk scenarios.
• Details risk control options and resilience enhancement measures.

7. Procedural Aspects

• Outlines key steps for World Bank staff in project preparation and implementation.
• Describes the submission timing of dam safety plans and the role of the Environmental and Social Review Summary (ESRS) and Environmental and Social Commitment Plan (ESCP).
• Includes prequalification procedures and technical assistance (TA) guidelines related to dam safety.
• Highlights the importance of legal and regulatory frameworks in dam safety management.

Supporting Documents and Resources

• Six Technical Notes (TNs) are referenced for detailed guidance on:
  • Hydrological risk
  • Geotechnical risk
  • Seismic risk
  • Small dam safety
  • Potential failure mode analysis (PFMA)
  • Portfolio risk assessment using a risk index
• Six appendices provide:
  • Sample frameworks for four dam safety plans
  • Terms of reference for panels of experts
  • References to ICOLD Bulletins, risk classification systems, and U.S. risk categories

Conclusion

The GPN serves as a valuable resource for World Bank staff and project teams to apply a risk-based approach to dam safety, ensuring that projects are developed with consideration for both environmental and social impacts. It supports the ESF implementation by offering comprehensive guidance, risk analysis tools, and procedural steps, while also emphasizing the importance of institutional capacity, regulatory frameworks, and collaboration among specialists. The document is intended to be reviewed and updated periodically to reflect evolving best practices in dam safety management.