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Global evidence of rapid urban growth in flood zones since 1985.

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Flood exposure and poverty in 188 countries.

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Globally, 1.81 billion people face high flood risks, with most in low-income nations. Targeted flood mitigation is crucial for resilient development, especially in South/East Asia and Sub-Saharan Africa.

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Area of Science:

  • Environmental Science
  • Disaster Risk Reduction
  • Socioeconomics

Background:

  • Flooding is a major natural hazard with severe consequences, particularly for low-income countries.
  • Understanding the intersection of flood risk and poverty is critical for effective disaster management.

Purpose of the Study:

  • To provide global estimates of population exposure to high flood risks, considering poverty levels.
  • To identify priority regions for flood mitigation efforts to foster resilient development.

Main Methods:

  • Utilized state-of-the-art global poverty data.
  • Employed advanced flood modeling for 1-in-100-year flood events.
  • Integrated poverty and flood exposure data to quantify affected populations.

Main Results:

  • 1.81 billion people (23% of the global population) are exposed to 1-in-100-year floods.
  • South and East Asia, particularly China and India, bear a significant burden of flood exposure (1.24 billion people).
  • 89% of flood-exposed individuals reside in low- and middle-income countries, with 170 million in extreme poverty.

Conclusions:

  • The study underscores the disproportionate impact of flood risk on vulnerable populations.
  • Findings highlight key regions and populations requiring urgent flood mitigation interventions.
  • Data supports targeted strategies for resilient development and poverty reduction in flood-prone areas.