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Impact of industrial growth on water resources of 204 medium and large factories in Songkhla province was study by using Geographic Information System. The study indicated that most industries which were registered before 1987 were mostly located in Amphoe Muang Songkhla and Amphoe Hat-Yai. After 1987, the industries expanded to Amphoe Sadao, Chana, Na Mom, Bang Klam and Rattaphum. The main Factor for industry expansion was the transportation route, especially main highways.
The results of the analysis of industry located in Songkhla Province reveal that impact on water resources, there are 132 industries located in the area that may have impact on water resources and 74 industries have direct impact on water resources. These factories are caneries, seafood processing plants, para rubber and latex manufacturers as well as animal feed plants. These industries are located in Amphoe Hat-Yai, Bang Klam, Sadao and Muang Songkhla which have direct impact on water quality in Khlong U-Tapao, Khlong Pha Wong, Khlong Phrack Suwan, Thale sap Songkhla and Gulf of Thailand. The water quality in this areas to be polluted.
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