2008年-世界发展银行全球_Adapting_to_Climate_Change_in_Europe_and_Central_Asia___Background_Paper_on_Water_Supply_and_Sanitation_41页_365kb

Summary of Adapting to Climate Change in Europe and Central Asia: Background Paper on Water Supply and Sanitation

Core Content

This document outlines the challenges and adaptation strategies for water supply and sanitation utilities in the Europe and Central Asia (ECA) region in the context of climate change. It emphasizes the need for integrated and flexible planning, given the increasing frequency and intensity of extreme weather events and the region's existing vulnerabilities in water infrastructure and management.

Main Points and Key Information

1. Climate Change Predictions and Impacts on Water Services

• The ECA region is expected to become wetter and warmer, with increased frequency of extreme weather events such as droughts, floods, heatwaves, and winter squalls.
• General climate trends include:
  • Higher temperatures leading to increased water demand and evaporation.
  • Decreased precipitation in southern sub-regions, impacting surface and groundwater resources.
  • Increased and more intense precipitation in northern sub-regions, affecting river and reservoir management.
  • Higher sea levels in the Adriatic, Baltic, Black, and Caspian Seas, leading to coastal erosion and flooding.
  • Declining levels in inland water bodies like the Aral Sea and Lake Baikal, causing ecological damage and reduced water availability.
  • Permafrost thawing in Siberia and Far-eastern Russia, threatening infrastructure stability.

2. Status of Water Utilities in the Region

• Low coverage, especially in rural areas, despite official reports of high coverage.
• High operating costs, low revenue, and significant investment backlogs.
• Inefficient systems and weak performance incentives.
• Transition challenges from centralized, subsidized systems to autonomous municipal companies.
• Transboundary issues and complex water markets affect service delivery and management.

3. Adaptation Strategies

• Short-term strategies focus on supply-side management and operational efficiency improvements.
• Medium-term strategies involve flood mitigation and infrastructure adaptation.
• Long-term strategies are required when climate change affects core utility functions, such as storage or water production.
• Cost-benefit analysis highlights that the costs of climate adaptation may be lower than the costs of maintenance and rehabilitation backlogs.

4. Key Challenges in Adaptation

• Identifying vulnerable utilities is critical. The document proposes a generalized model to assess vulnerability based on:
  • Economic risk factors (macroeconomic environment).
  • Utility endowment risk factors (infrastructure condition).
  • Utility operations risk factors (operational efficiency).
  • Resource risk factors (robustness and diversity of water sources, and position in the water market).
• B2 utilities (highest risk and lowest capacity) require urgent attention and long-term support.

5. Policy Responses and Institutional Support

• Sophisticated financial and policy instruments are needed to support adaptation.
• External support is essential for:
  • Building capacity and skills.
  • Bridging knowledge gaps through global adaptation experience.
  • Developing appropriate policy and financial options.
  • Providing financial injections.
  • Supporting local data collection and empirical analysis.

Key Extreme Weather Events and Risks

Floods

• Floods are the most common natural disaster in ECA.
• Examples include:
  • The 1997 Oder basin flood in Central and Southeastern Europe, which caused $3.4 billion in damages in Poland.
  • The 2002 100-year flood in Central Europe, which led to billions of euros in damage.
  • Flood-induced turbidity in New York City reservoirs, increasing treatment costs and water quality risks.
• Floods threaten water supply and sewerage infrastructure, and may lead to contamination and sediment loading.

Droughts

• Droughts are increasing in frequency and severity, especially in Southeastern Europe and Central Asia.
• Examples include:
  • Summer droughts in Bulgaria, causing $2% of GDP in crop losses.
  • Droughts in Romania affecting river basins and water availability.
  • Spain’s severe drought has led to water rationing and imports.
• Droughts impact water quality, groundwater depletion, and saline intrusion.

Karst Water Vulnerability

• Karst water systems in Southeastern Europe (e.g., Croatia, Montenegro, Vienna) are sensitive to climate changes.
• These systems are unreliable and prone to salinization and dry-ups.
• Wastewater contamination is a significant risk in karst areas, requiring disinfection measures.

Conclusion and Outlook

• Climate change will exacerbate existing water management challenges in the ECA region.
• Adaptation is critical, especially for utilities already under stress.
• Short-term actions (e.g., improving operational efficiency) can provide immediate benefits in terms of resilience and cost reduction.
• Long-term planning and investment are necessary, but external support is essential for many ECA utilities to implement effective adaptation strategies.
• Research and policy development are needed to address the complex interlinkages between climate change, water resources, and socio-economic factors.

Support and Research Needs

• Improved climate data and forecasting tools are needed for accurate planning.
• Policy and financial innovation is required to support adaptation.
• Collaboration across borders is essential due to transboundary water issues.
• Investment in infrastructure and capacity building must be prioritized for B2 utilities.
• Empirical data and local analysis are crucial for informed decision-making.