2014年-世界发展银行全球_Solomon_Islands___Rapid_Assessment_of_the_Macro_and_Sectoral_Impacts_of_Flash_Floods_in_the_Solomon_Islands_April_2014_84页_2mb

Summary of Rapid Assessment of the Macro and Sectoral Impacts of Flash Floods in the Solomon Islands, April 2014

Core Content

This document presents a rapid assessment of the macro and sectoral impacts of the flash floods that occurred in the Solomon Islands between April 1 and April 4, 2014. The assessment outlines the extent of damage, economic implications, recovery needs, and recommendations for flood risk management and urban resilience.

Main Points

1. Event Overview

• A slow-moving tropical depression caused heavy rainfall, leading to flash floods in Honiara, Guadalcanal, Isabel, Malaita, and Makira-Ulawa.
• The highest recorded daily rainfall was 318 mm in Honiara on April 3.
• Over 732 mm of rain was recorded at the Honiara rain gauge over four days.
• The system was upgraded to Tropical Cyclone Ita on April 5.

2. Damage and Loss

• The total economic impact is estimated at SI$787.3 million (US$107.8 million), equivalent to 9.2% of GDP.
• Housing and transport were the most affected sectors, accounting for 56% and 23% of total damage, respectively.
• Mining and agriculture experienced the greatest economic losses, at 50% and 31% of total damage.
• 22 fatalities were reported, and 10,000 people were internally displaced, with 52,000 people affected in total.

3. Macroeconomic Impact

• The flood is expected to cause a 5.1% decline in GDP from the pre-flood baseline.
• The closure of the Gold Ridge mine is a major contributor to the negative impact, accounting for 26% of total losses.
• The current account deficit is projected to increase by 2.6% in 2014, primarily due to mine closure.
• Government revenue is estimated to decrease by SI$193.2 million, with SI$120 million attributed to the mine closure.

4. Recovery and Reconstruction Needs

• Total recovery and reconstruction costs are estimated at SI$401 million (US$56.03 million).
• Short-term needs amount to SI$99 million (US$14.59 million), while medium- to long-term needs total SI$302 million (US$41.44 million).
• Preliminary aid of US$13.58 million is expected, reducing the total recovery cost to US$41.5 million.
• Sectors such as health, education, and water and sanitation may be able to absorb some costs from their sector budgets.

5. Flood Risk Management and Resilience

• The disaster was largely due to unregulated urbanization, low-resilience housing, and limited community response.
• Key flood risk management actions include:
  • Modifying the hazard (e.g., drainage works, river bank protection, catchment forestation).
  • Modifying human use of floodplains (e.g., incentives, education, informal settlement upgrading).
  • Modifying human response to flooding (e.g., early warning systems, hazard-proof evacuation centers).
• A master plan for urban flood risk management is recommended, including:
  • Flood hazard mapping.
  • Community consultation for informal settlement upgrades.
  • Flash flood warning system for the Mataniko River.
  • Flood risk coordination mechanism.

Key Sectors and Their Impacts

1. Transport

• Damage: SI$87.6 million (US$14.2 million).
• Loss: SI$16.1 million.
• Short-term recovery needs: SI$5.84 million (US$5.84 million).
• Medium- to long-term needs: SI$28.81 million.
• Funding: US$12.08 million already sourced.

2. Water, Sanitation, and Drainage

• Damage: SI$8.3 million.
• Loss: SI$24.9 million.
• Short-term recovery needs: SI$0.74 million.
• Medium- to long-term needs: SI$4.5 million.
• Funding: US$370,000 received from DFAT Australia and World Vision.

3. Agriculture

• Damage: SI$8.8 million.
• Loss: SI$122.7 million.
• Short-term recovery needs: SI$2.9 million.
• Medium- to long-term needs: SI$2.73 million.
• Funding: US$1.13 million indicated.

4. Housing

• Damage: SI$213.2 million.
• Loss: SI$5.6 million.
• Short-term recovery needs: SI$2.62 million.
• Funding: US$14.59 million from development partners.

5. Health and Education

• Damage: SI$10.1 million.
• Loss: SI$11.1 million.
• Total damage and loss: SI$21.2 million (US$2.9 million).
• Short-term recovery needs: SI$1.49 million.
• Medium- to long-term needs: SI$5.42 million.
• Funding: US$41.5 million from aid and sector budgets.

Way Forward

• The government and donors should consider funding options and financing sources for recovery needs.
• A donor conference should be organized to assess the full potential of international assistance.
• Line ministries should determine the level of costs that can be absorbed from sector budgets.
• A detailed recovery and resilience plan is needed for each sector, with clear funding priorities.
• Flood risk management must be prioritized, including:
  • Strengthening the national flood warning system.
  • Upgrading informal settlements.
  • Implementing flood-resilient infrastructure.
  • Enhancing storm water management.

Conclusion

The flash floods of April 2014 had severe economic and social impacts across the Solomon Islands. The government and its development partners must work together to address both immediate recovery needs and long-term flood risk reduction strategies to build a more resilient society.