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Mostly populous city like Chennai is subjected to frequent flooding due to its complex 11 nature of natural and man-made activities. From the analysis of the past records of flood events of 1943,1976,1985,2005 and 2008,it has been observed Adayar watershed is subjected to cataclysmic 13 flooding in low-lying areas of the city and its suburbs because of inoperativeness of the local 14 drainage system, rainfall associated with cyclonic activity, topography of the terrain, encroachments 15 along the floodplain, hugh upstream flow discharge into the river and the highly impervious area