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FLOOD MAPPING OF CHALAKUDY BLOCK USING GIS
Sruthy N. M.*, Radha Unnikrishnan M., Feby Martin, Anjana Anilkumar, Jaito Johnson and Gokulkrishna P. G.
Flood is a natural disaster which occurred in Kerala in consecutive 3years of time. During the months of July and August the monsoonstrengthens and rivers overflow. Two days of torrential rain had filledall upstream dams on Chalakudy river on August 15, 2018. As theflood gates of four dams (Thoonakadavu, Upper Sholayar, LowerSholayar, Neerar Dam in Tamil Nadu) water came gushing toPeringalkuthu dam which started overflowing at 4.30am on August 16.All the streams, low-lying areas and agricultural fields in the river'sproximity was flooded. All the towns and villages within 5 km of the river were floodedexcept the slightly high hill tops. It was the worst flood in Chalakudy in nearly a century. TheIndian government had declared it a Level 3 Calamity, or "calamity of a severe nature". Inthis paper ArcGIS is used to map the flood hazard regions of the Chalakudy block. Thethematic maps used are land use, soil map, slope, drainage and rainfall. The hazard map thusprepared shows the places which are more susceptible to flood. Weighted overlay analysis isused for overlaying the maps. From the map it is seen that downstream side of Chalakudyriver is more susceptible to flood like Panchayats of Koratty, Kadukutty, Meloor, Kodassery,Pariyaram and some parts of Athirappily.[Full Text Article] [Download Certificate]