Ratnapura district has an area of 3,275 square kilometers and a population of 1,082.3. The study area is prone to natural and manmade disasters and most of them are originated from metrological events. The main objective of this study was to understand disaster risks of the study area. The other objectives were to examining risk drivers and mitigation process of the Ratnapura district. The identification of extreme rainfall, flood gage level, disaster related deaths and damages was done based on the data collected from the Departments of Meteorology, Irrigation and Disaster Management of Sri Lanka. Disaster inventory map, disaster vulnerability map and disaster risk map were produced to understand the disaster and the risk associated with GIS technology. Gumbal and SINMAP model developed only for RMC and Elaphatha DSD. 56 present families were recorded flood affected from Ratnapura DSD during 1974 - 2017 years. Inventory map shows Elapatha, Ratnapura and Nivithigala as highly risk areas by flood. Gumbal model shows Ratnapura Municipality is 64.3 percent, and it comes under the high flood hazard zone. During the years 1974 - 2010, 45% recorded deaths by landslide in the Elapatha DSD. 5.62 % areas are unstable in the Elaphatha DSD. Vulnerability map and even more risk map will help priorities to the socio - economic planning, and mitigation process in the Ratnapura District.
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