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Title: Flood Risk Mapping in Kalyan Dombivli region, Mumbai using Remote Sensing and GIS techniques.
Authors: Krishnan, Sneha
Keywords: School of Habitat Studies
Issue Date: 2011
Abstract: The city of Mumbai is a chain of islands surrounded by the great Arabian Sea on the western coast of India. The location of the city along the coast and presence of many rivers, estuaries and creeks exposes it to many climatic emergencies and environmental hazards (Nicholls, 1995). Urban infrastructure encompasses many components that are exposed to the threat of disasters. The separate systems, sub-systems as well as individual components of wider elements like transport, communications, housing, commerce, water and sanitation, power as well as industries bear the brunt of the calamities. In the city of Mumbai on 26 th of July 2005 brought the entire city to a halt. Every assessment report exploring the causes of the floods blamed urban planning and found it to be missing the component of long-term development.The flood risk mapping of Kalyan Dombivli region, Mumbai looks at the continuous issue of constant waterlogging in these regions during the monsoons. Hence it is very important to analyze economic damages and provide flood mitigation measures not just structural but also non-structural so as to reduce the impacts of flood as a hazard. Remote Sensing and Geographical Information Systems has been applied in the mapping of flood risk areas to help be prepared and to strengthen local infrastructure. The main aim of the study is flood risk mapping in Kalyan-Dombivli area with respect to the physical, demographical and socio-economical vulnerability indicators. With the major river Ulhas flowing along the region and rapid growth of urban areas there have been many indicators of risk which was analysed in this paper. The study looks at primary data like physical, socio-economic and flood related issues as also secondary data like demography, rainfall block wise information etc. The secondary data generation involved digitizing thematic maps based on the study area base map obtained from SOI toposheets and IRS P6 LISS 4 data of the given study area. The major objective of the study is thus to trace the growth of urban settlements using toposheets and satellite images. For the purpose of analysis however risk was considered in terms of physical vulnerability, socio-economic vulnerability, demographic data and various hazard indicators like flood level inundation maps and rainfall data.
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