ANNOUNCEMENTS
Excessive precipitation and flooding as a result of climate change have happened globally in recent decades, paralyzing cities, and causing significant social and economic implications. Furthermore, due to increasing urbanization, and the broader context of poor drainage, urban flooding is a common occurrence. As a result, storm water management strategies to reduce the risk of flooding are critical. Urban flood modelling assist in developing appropriate strategy, construction, and administration framework to aid in the resolution of urban issues. The integration of two models helps to overcome the constraints of separate models in this study, which exhibits urban flood modelling by coupling 1-D and 2-D modelling approaches. Based on the weather characteristics of the area, this study aims to create a hydraulic network integrated with rainfall-runoff modelling and boundary conditions for a small developing area-Chalakudy municipality, which will assist in the management of extreme rainfall events. Three separate precipitation episodes were used to evaluate the model's responsiveness to changes in rainfall input. The rainfall scenarios include moderate rainfall, the maximum rainfall in the last 20 years, and extreme rainfall. The model was also revised to evaluate if the flooding scenario could be alleviated by making design changes. The study concludes that modifying hydraulic elements could make the sewerage system more efficient at handling excess water inflow. The value of indicators used for highlighting flood prone areas, such as water level minus critical level in nodes and links, along with maximum water depth and extent of inundation on surface, indicated that as rainfall increased, water levels exceeded the defined critical level, and inundation was at its peak during extreme rainfall event. The study will aid in the knowledge of real-world flow dynamics in urban environments, as well as the modelling of urban floods and the construction of an integrated sewage system.
Keywords: Urban floods, Urbanization, 1-D modelling, 2-D modelling, integrated sewerage system, hydraulic elements.
