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2018 Sri Lanka floods and landslides caused from an annual heavy southwest monsoon beginning around 19 May. As of 26 May 2018; the monsoon floods affected in about 19 districts, killed at least 21 people, about 150, 000 people were affected and further left approximately 23 people missing.[1][2][3][4][5] The death casualties were reported from 22 May onwards in the provinces including South, Northwest, North and East.[6][7] About 4 people were reported dead due to lightning, 5 people were killed due to floods and lightning, 8 people died due to drowning and further left 4 people dead resulting from fallen trees.[8][9] The DMC report claimed about 400, 000 people have been displaced to safer locations.[10][11][12] About 105 houses were reported to have fully damaged and over 4832 houses have been partially damaged.[13]
The red alert was issued to areas which are surrounded near rivers such as Kelani Ganga, Kalu Ganga, Gin Ganga and Nilwala River.[14] Residents who were living surrounding the red alerted areas were forced to be evacuated by security personnel.[15] The reports also stated that the rivers Kelani river and Kalu river have been overflowing due to heavy flash floods.[16] Further the Meteorological Department of Sri Lanka predicted further rainfall in the coming days especially in the south and west parts of the country before the conclusion of the monsoon season.[17] After the end of the monsoon period, few parts of the country including commercial capital Colombo received torrential rains.[18]