APPLICATION OF GEOGRAPHIC INFORMATION SYSTEM TO FIND FLOOD RISK AREAS IN THE SONGKLA LAKE BASIN

Abstract

Application of Geographic Information System to Find Flood Risk Areas in the Songkhla Lake Watershed is intended for the study of flood-prone areas in the Songkhla Lake Watershed by applying a geographic information system together with data analysis using data overlay techniques of geographic information systems and Multi Criteria Modeling (MCM) coupled with weight configuration by the Analysis Hierarchy Process (AHP). There were factors used for flood analysis, including rainfall, slope of the area, altitude, density of waterways, the size of the sub-watershed area, soil drainage capacity, and land use. The study found that the most flood-prone areas are approximately 1,716.35 square kilometers, which accounted for 19.96 percent of the lowland area of the lake. Followed by the riskiest with an area of about 1,057.55 square kilometers, which accounts for 12.3 percent, and the non-risk area with an area of approximately 1,253.6 square kilometers, which represents 14.58 percent, which is an area with a very steep slope and the soil has good drainage.