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A platform for research: civil engineering, architecture and urbanism
Improving Urban Flood Resilience—An Innovative Approach Based on Nature Based Solutions
Urban flooding is a major problem faced by many cities and towns when their existing drainage infrastructure cannot withstand constant heavy rainfall. Extreme weather conditions increase water flow and cause flooding. Urban areas are often flooded, due to increased urbanization, low infiltration rates, and inadequate stormwater drainage network structures. Rapid urbanization of relatively small watersheds driven by population growth expands enclosed areas, reduces infiltration, increases runoff, and increases the risk of flooding in urban areas. Kochi Municipal Corporation in the Ernakulam district, which is considered as the economic nerve centre of the state, is repeatedly facing pluvial flood in the past years. In this work, detailed 1D and 2D urban flood models were simulated with the PCSWMM software to mimic the characteristics of urban flooding in the Kochi Corporation and the flood vulnerable zones in the study area were identified. Later the model incorporated Low Impact Development (LID) practices which are the sustainable drainage solution that can make tremendous changes in the peak and volume of runoff. Results shows that in the individual scenario, the reduction in the peak runoff is maximum (19 to 46%) while using permeable pavement alone. But maximum reduction in peak runoff is obtained in combined scenario of permeable pavement, bio-retention cell, and rain barrel, which is about 48% to 66%. Hence, LID has the ability to restore the predevelopment hydrological conditions of the site. Finally, the improvement in flood resilience of the study area is analysed by comparing flood model with both scenarios.
Improving Urban Flood Resilience—An Innovative Approach Based on Nature Based Solutions
Urban flooding is a major problem faced by many cities and towns when their existing drainage infrastructure cannot withstand constant heavy rainfall. Extreme weather conditions increase water flow and cause flooding. Urban areas are often flooded, due to increased urbanization, low infiltration rates, and inadequate stormwater drainage network structures. Rapid urbanization of relatively small watersheds driven by population growth expands enclosed areas, reduces infiltration, increases runoff, and increases the risk of flooding in urban areas. Kochi Municipal Corporation in the Ernakulam district, which is considered as the economic nerve centre of the state, is repeatedly facing pluvial flood in the past years. In this work, detailed 1D and 2D urban flood models were simulated with the PCSWMM software to mimic the characteristics of urban flooding in the Kochi Corporation and the flood vulnerable zones in the study area were identified. Later the model incorporated Low Impact Development (LID) practices which are the sustainable drainage solution that can make tremendous changes in the peak and volume of runoff. Results shows that in the individual scenario, the reduction in the peak runoff is maximum (19 to 46%) while using permeable pavement alone. But maximum reduction in peak runoff is obtained in combined scenario of permeable pavement, bio-retention cell, and rain barrel, which is about 48% to 66%. Hence, LID has the ability to restore the predevelopment hydrological conditions of the site. Finally, the improvement in flood resilience of the study area is analysed by comparing flood model with both scenarios.
Improving Urban Flood Resilience—An Innovative Approach Based on Nature Based Solutions
Lecture Notes in Civil Engineering
Pandey, Manish (editor) / Umamahesh, N. V. (editor) / Ahmad, Z. (editor) / Valyrakis, Manousos (editor) / Viswanath, Saranya (author) / Chithra, N. R. (author)
International Conference on Hydraulics, Water Resources and Coastal Engineering ; 2023 ; Warangal, India
2025-01-21
22 pages
Article/Chapter (Book)
Electronic Resource
English
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