2014年-世界发展银行全球_Climate_Change_and_Water_Resources_Planning_Development_and_Management_in_Zimbabwe___An_Issues_Paper_95页_2mb

Summary of "Climate Change and Water Resources: Planning, Development and Management in Zimbabwe"

Core Content

This document is an Issues Paper prepared by the World Bank, commissioned by the former Ministry of Water Resources Development and Management (MWRDM) in Zimbabwe. It focuses on the impacts of climate change on water resources and provides recommendations for adaptation strategies in the water sector. The paper aims to support the development of the National Climate Change Response Strategy (NCCRS) and align with the National Water Policy (NWP).

Main Points

1. Water and the Economy

• Water is central to Zimbabwe's economy, health, and social wellbeing.
• Key sectors such as agriculture, energy, mining, and tourism rely heavily on water.
• The water sector itself depends on the recovery of these sectors for financial sustainability.

2. Climate Change and Water

• Climate change poses a significant threat to water resources, though its impacts are not yet fully integrated into planning and management.
• The National Water Policy (NWP) recognizes climate change and calls for specific actions to manage its effects.
• The National Climate Change Response Strategy (NCCRS) is being developed to mainstream climate change into all economic sectors, with water resources at the core.

3. Water Resources Availability and Use

• Zimbabwe's mean annual precipitation (MAP) varies from 337 mm/year in the south to 1110 mm/year in the Eastern Highlands.
• The country has a large number of dams for water storage, with a total storage capacity of ~9 x 10⁶ Ml (excluding Lake Kariba).
• Groundwater provides water to over 70% of the population and is a key resource for irrigation, mining, and tourism.
• Water quality is often poor due to pollution from point and diffuse sources, including industrial discharges, untreated sewage, and artisanal mining activities.

4. Climate Change Impacts on Water Resources

• The study predicts a significant reduction in precipitation and surface and groundwater resources across most catchments.
• Runde, Gwayi, and Mzingwane catchments are expected to be the most affected, with precipitation declines of 12-16% by 2050.
• Manyame and Mazowe catchments are likely to be the least affected.
• Runoff is expected to decrease more than precipitation due to global warming.
• Groundwater recharge will also decline in some catchments, especially Mzingwane and Runde, due to reduced precipitation.

5. Case Studies

• Harare Water Supply: Faces challenges due to climate variability and infrastructure degradation.
• Bulawayo Water Supply: Also vulnerable to climate change and requires investment and planning.
• Roswa Dam Operations: Highlights the need for adaptive management in water infrastructure.
• Limpopo Basin: Irrigation: Shows the importance of irrigation in the region and the risks posed by climate change.
• Kariba Hydropower Operations: Emphasizes the vulnerability of hydropower to reduced river flows.

6. Adaptation Opportunities

• Water Resources Governance: Requires inter-ministry coordination and institutional reforms.
• Water Resources Planning and Management: Must incorporate climate change projections and adaptive measures.
• Water Resources Infrastructure: Needs rehabilitation and modernization, especially in dam and irrigation systems.
• Information, Public Education, and Communications: Essential for raising awareness and promoting adaptive behaviors.

Key Findings

• Climate change will lead to reduced precipitation and water availability across most of Zimbabwe.
• Groundwater is a critical resource but suffers from limited monitoring and underdeveloped management.
• Water quality is deteriorating due to pollution from various sources.
• Adaptation strategies should include both structural (e.g., infrastructure upgrades) and non-structural (e.g., policy reforms, public education) measures.
• No-regrets actions are recommended, as they are beneficial regardless of the severity of climate change impacts.

Recommendations

• Develop a specific Climate Change Adaptation Strategy for the water sector to complement the NCCRS.
• Enhance climate change awareness and integrate climate projections into water planning and management.
• Strengthen water governance through inter-ministry coordination and institutional reforms.
• Improve monitoring and data collection for both surface and groundwater resources.
• Invest in dam safety, rehabilitation, and modernization of water infrastructure.
• Implement public education and communication programs to promote sustainable water use and awareness of climate risks.

Conclusion

Zimbabwe faces significant climate change-related challenges in its water sector, including reduced precipitation, degraded water quality, and increased vulnerability in certain catchments. The paper emphasizes the need for a comprehensive and integrated adaptation strategy, supported by technical and financial assistance, to ensure the sustainability and resilience of water resources in the face of climate change. The National Water Policy and NCCRS provide a framework for this, but their successful implementation requires coordinated action, investment, and capacity building.