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<p>Urban stormwater management under climate change is becoming more critical from the water sustainability point of view. This study explores the role of ecosystem services in managing stormwater in the floodplain of the River Yamuna, focusing on selected five Municipal Corporation zones of Delhi which are adjacent to the river. The study primarily quantifies te impact of green spaces on ecosystem services, and analyzes forty years of daily rainfall data to identify critical periods for stormwater management to assess the correlation between green spaces and water retention capacity. Further, nature-based solutions are important for suatainable ecosystem services that depend on the green infrastructure. In this context, Integrated Valuation of Ecosystem Services and Trade-Offs (InVEST) platform is an important way of urban storm water management. In this study, annual stormwater retention capacity and runoff generation have been calculated using the InVEST-Urban Stormwater Retention Model, while two individual storm events have been analyzed with the InVEST-Urban Flood Risk Mitigation model to compare the change in stormwater retention volume and flood volume for different rainfall depths. The study uses remote sensing and other open-source datasets for spatial analysis. Results show that Central zone of Delhi has 38% green cover, while City-SP, Civil Lines, Shahdara North, and South have 25%, 23%, 19%, and 23% green cover, respectively from the selected five zones. Rainfall data reveals an increasing trend in annual rainfall, with extreme events peaking in pre-monsoon season. Runoff ratios in congested built-up areas reach nearly 0.87, while grasslands exhibit lower runoff ratios of 0.45. In densely vegetated areas, runoff ratios drop to 0.41, with the highest stormwater retention (0.83) observed in areas with substantial green canopies close to the river. Grasslands retain water with a capacity of 0.55, while sparsely vegetated areas and agricultural lands show lower retention values of 0.45 and 0.30, respectively. With 60% rise inrainfall depth between two storm events, averageretention capacity has decreased by nearly 12%, while total runoff retention capacity increased by 36% whereas flood increased by 118%. For the study area. A positive correlation (r = 0.755) between green spacesand water retention capacity is identifiedIt is also observed that theimpervious surfaces in the eastern part of the study area show a weaker correlation between low green space coverageand lower retention capacity compared to the western portion. Finally, this study quantitaivelyeshtablishes the critical role of green infrastructure in reducing urban flood risk, underscoring the remidials for sustainable stormwater management practices.</p>

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Ecosystem services importance in stormwater management and flood risk mitigation through InVEST model—a case study on MCD zones of Delhi

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Mitthan Lal Kansal,
  • Suddhasil Bose

摘要

Urban stormwater management under climate change is becoming more critical from the water sustainability point of view. This study explores the role of ecosystem services in managing stormwater in the floodplain of the River Yamuna, focusing on selected five Municipal Corporation zones of Delhi which are adjacent to the river. The study primarily quantifies te impact of green spaces on ecosystem services, and analyzes forty years of daily rainfall data to identify critical periods for stormwater management to assess the correlation between green spaces and water retention capacity. Further, nature-based solutions are important for suatainable ecosystem services that depend on the green infrastructure. In this context, Integrated Valuation of Ecosystem Services and Trade-Offs (InVEST) platform is an important way of urban storm water management. In this study, annual stormwater retention capacity and runoff generation have been calculated using the InVEST-Urban Stormwater Retention Model, while two individual storm events have been analyzed with the InVEST-Urban Flood Risk Mitigation model to compare the change in stormwater retention volume and flood volume for different rainfall depths. The study uses remote sensing and other open-source datasets for spatial analysis. Results show that Central zone of Delhi has 38% green cover, while City-SP, Civil Lines, Shahdara North, and South have 25%, 23%, 19%, and 23% green cover, respectively from the selected five zones. Rainfall data reveals an increasing trend in annual rainfall, with extreme events peaking in pre-monsoon season. Runoff ratios in congested built-up areas reach nearly 0.87, while grasslands exhibit lower runoff ratios of 0.45. In densely vegetated areas, runoff ratios drop to 0.41, with the highest stormwater retention (0.83) observed in areas with substantial green canopies close to the river. Grasslands retain water with a capacity of 0.55, while sparsely vegetated areas and agricultural lands show lower retention values of 0.45 and 0.30, respectively. With 60% rise inrainfall depth between two storm events, averageretention capacity has decreased by nearly 12%, while total runoff retention capacity increased by 36% whereas flood increased by 118%. For the study area. A positive correlation (r = 0.755) between green spacesand water retention capacity is identifiedIt is also observed that theimpervious surfaces in the eastern part of the study area show a weaker correlation between low green space coverageand lower retention capacity compared to the western portion. Finally, this study quantitaivelyeshtablishes the critical role of green infrastructure in reducing urban flood risk, underscoring the remidials for sustainable stormwater management practices.