Study on the application of geographic information system to study the area vulnerable to flooding. In the area of phattalung is aimed to study the area prone to flooding and to study area, phattalung risk flooding area rice field. In phatthalung by applying geographic information systems with overlapping data, meteorological factors and physical factors, information that affect the flooding rainfall data is data watershed size. Slope of the terrain data. LP style information. Information on the depth of the soil and land utilization information. Study results showed that we have a voice to phatthalung province caused flooding in most high level. The area is about 2182.73 square kilometers (67.75%) is also a risk of flooding in 778.36 medium square kilometers (24.16%) and the risk of low birth, ut in an area of approximately eight square kilometers (260.45.08.) that the area vulnerable to flooding in most high level Java yopriwen Eastern organized action of the education area, adjacent to the Songkhla lake basin are mainly low level sound is located on the western part of the area of study of bonwen which mountains are La.Dachan, and from areas vulnerable to flooding area rice field. It was found that most of the rice area in phatthalung in areas vulnerable to flooding, the most high, because most of the rice area is on the Plains, paddy fields have sasiang affected by the occurrence of ut. That flood problems causing loss of both lives and property.
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