Transforming OSR Land into an Urban Wetland: an Integrated Landscape Solution for Flood Risk Mitigation in case of Porur, Chennai

Abstract

The escalation of urbanization alongside climate change has heightened flood vulnerability in numerous cities globally, including Chennai, India. The swift expansion of impermeable surfaces and insufficient drainage infrastructure compounds urban flood risks, resulting in substantial economic, social, and environmental ramifications. In response, the concept of a sponge city has emerged, advocating for a comprehensive approach to urban flood management through the integration of green infrastructure, sustainable drainage systems, and water-sensitive urban design. This study investigates the feasibility and efficacy of applying the sponge city concept to mitigate flood risk in Chennai. Employing a combination of literature review, field surveys, and data analysis, the research assesses Chennai's current flood risk landscape, identifies primary contributors to urban flooding, and evaluates the potential of sponge city interventions to bolster resilience against flood hazards. Utilizing a mixed-methods approach, the research combines quantitative hydrological modeling techniques with qualitative evaluations of stakeholder perspectives and socioeconomic impacts. By scrutinizing existing flood management strategies and drawing lessons from other city case studies, the study identifies effective practices that can inform the development of a tailored sponge city strategy for Chennai, considering its distinct socio-environmental context. Moreover, the thesis explores the challenges and opportunities inherent in implementing sponge city initiatives, including governance frameworks, financial mechanisms, and community involvement strategies. It underscores the significance of collaborative multistakeholder efforts and participatory decision-making processes in fostering resilience and adaptability to urban flooding. This research contributes to the growing knowledge base on urban flood risk management and sustainable urban development. By advocating for the adoption of the sponge city concept in Chennai, the study aims to equip policymakers, planners, and practitioners with evidence-based insights and recommendations to enhance the city's resilience to future flood events while advancing ecological sustainability and socioeconomic progress.