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In each incident, flood causes devastation and difficulty to the victims. This research aims to study rain intensity which causes floods in Mueang Phetchaburi District. The analysis was based on six major flood incidents in Mueang Phetchaburi District during 2003-2016, daily rainfall data from 11 stations reported by Meteorological Department and the Royal Irrigation Department, daily runoff data from 6 stations reported by the Royal Irrigation Department in Phetchaburi watershed, and sea tide data from 1 station reported by Marine Department. The study found that rain intensity which causes flood in Mueang Phetchaburi District includes 1) rainfall accumulation over 100 mm in two days within Mueang Phetchaburi District or 2) rainfall over 100 mm per day above Mueang Phetchaburi District or rainfall accumulation over 200 mm in two days or 3) the amount of runoff was more than 150 cubic meters per second at B.10 streamflow station. It was also found that the highest sea tide level was more than 3.90 m. MSL. These are the factors affecting slower water flow into the sea resulting a longer flood in the area. When the situation arises, the people should be warned in order to be prepared for the coming flood.
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