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Understanding the impact of land-use change on urban floods and evaluating alternate methods for stormwater management using Low Impact Development
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  • Yaswanth Kottali,
  • Venkatesh Kasi,
  • Maheswaran Rathinasamy
Jawaharlal Nehru Technological University, Kakinada, India.

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Yaswanth Kottali
Jawaharlal Nehru Technological University
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Venkatesh Kasi
Indian Institute of Technology
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Maheswaran Rathinasamy
Indian Institute of Technology, Hyderabad, India.
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Due to urbanization, there is an increase in the impervious surface and in peak runoff volumes. In the past, there is significant damage caused by urban floods. Urban floods are becoming more frequent disasters in recent decades due to rapid changes in Land Use and Land Cover. In this study, we compare the impact of land-use changes on peak runoff and timing for the last three decades using the PCSWMM model for the semi-urban clusters in South India. Further, we analyze the effect of future development on peak runoff. It was observed that there is a considerable increase in flood peak (82.49%) when compared to the last decade. We proposed and evaluated alternate methods under future land use (2040) using LID wherein different scenarios were generated and tested. To evaluate the changes in hydrological characteristics, three scenarios at a regional scale were explored. The first scenario is the present situation. The second one is the traditional urban development scenario and the third one is urban development with LID controls. The model simulation results confirmed the effectiveness in reducing the surface runoff depth, peak flow rate, total flood volume, and earlier peak times using LIDs.