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<p>Urban flooding significantly degrades quality of life and disrupts essential city services. Blue–Green Infrastructure (BGI) integrates natural elements into urban drainage systems, providing environmental, social, economic, and physical benefits. However, the shift toward this paradigm passes through multiple sectors before reaching end users, who often face challenges in quantifying the benefits that justify public investments. This study hypothesizes that BGI, when combined with existing gray infrastructure to form a hybrid system, can deliver additional benefits and that involving end users early in the design process enhances decision-making and fosters effective implementation. Two primary objectives guide this research: first, to demonstrate the effectiveness of hybrid blue–green–gray infrastructure in mitigating urban flooding; second, to develop and validate guidelines promoting BGI adoption in flood-prone areas, informed by stakeholder-identified opportunities and threats. An exploratory case study in Rio de Janeiro applied a hydrodynamic model, revealing a 40.75% reduction in flooding. Additionally, an online survey with residents and experts evaluated acceptance of the proposed strategies, uncovering strengths, weaknesses, opportunities, and threats. Based on these insights, guidelines were formulated around four pillars: urban planning, environmental quality, community awareness, and sustainable maintenance. These guidelines aim to support balanced and adaptive urban development, enhancing both social and environmental resilience.</p> Graphical abstract <p></p>

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Evaluating blue–green Infrastructure for urban flood mitigation and sustainable development: a case study in the Acari River Watershed, Rio de Janeiro

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Maria Vitória Ribeiro Gomes,
  • Antonio Krishnamurti Beleño de Oliveira,
  • Wallace Correa de Moura Filho,
  • Luciana Fernandes Guimarães,
  • Marcelo Gomes Miguez,
  • Aline Pires Veról

摘要

Urban flooding significantly degrades quality of life and disrupts essential city services. Blue–Green Infrastructure (BGI) integrates natural elements into urban drainage systems, providing environmental, social, economic, and physical benefits. However, the shift toward this paradigm passes through multiple sectors before reaching end users, who often face challenges in quantifying the benefits that justify public investments. This study hypothesizes that BGI, when combined with existing gray infrastructure to form a hybrid system, can deliver additional benefits and that involving end users early in the design process enhances decision-making and fosters effective implementation. Two primary objectives guide this research: first, to demonstrate the effectiveness of hybrid blue–green–gray infrastructure in mitigating urban flooding; second, to develop and validate guidelines promoting BGI adoption in flood-prone areas, informed by stakeholder-identified opportunities and threats. An exploratory case study in Rio de Janeiro applied a hydrodynamic model, revealing a 40.75% reduction in flooding. Additionally, an online survey with residents and experts evaluated acceptance of the proposed strategies, uncovering strengths, weaknesses, opportunities, and threats. Based on these insights, guidelines were formulated around four pillars: urban planning, environmental quality, community awareness, and sustainable maintenance. These guidelines aim to support balanced and adaptive urban development, enhancing both social and environmental resilience.

Graphical abstract