Application of Geographic Information System for Analysis of Flood Risk Areas in Kolok River Basin, Narathiwat province

Abstract

The objective of this research is to analyze the flood risk areas using the GIS model combined with the analytical hierarchical process in Kolok River Basin, Narathiwat. Land use and soil series are considered. The risk of flooding areas is categorized into five levels including the lowest, low, moderate, high and very high. The result shows that 35 percent of the total area is in the high flood risk area that is covered 76 percent of agricultural land. Moreover, the soil series has quite bad drainage characteristics. Finally, the performance of the proposed method is similar to GISTDA in terms of flood forecasting, with an area of 41.37 square kilometers, or 92.16 percent of total high real flood areas.