The municipality of Bayombong is one of the municipalities in the Philippines that has greatly suffered from flood impacts. In order to minimize the severe impacts of flood, flood susceptibility map can be formulated. Therefore, this study was conducted to generate a flood susceptibility map of the municipality of Bayombong. It further aimed to determine the areas in hectares for each level of susceptibility to flood based on the chosen flood-influencing factors namely, precipitation, elevation, distance from river, slope, and land cover. Furthermore, the study used the AHP technique and GIS weighted overlay tool in determining the municipality's susceptibility to flood. The five factors were classified into five (5) flood susceptibility level (very low, low, moderate, high, very high). The results presented in this study shows that the majority of the municipality is high susceptible to flood with an area of 5,655.40 hectares. Moreover, Bonfal East, Bonfal West, Bonfal Proper, District 4, Don Domingo Maddela, Don Mariano Marcos, Don Tomas Maddela, Don Mariano Perez, La Torre South, Luyang, Salvacion, San Nicolas, Santa Rosa and Vista Alegre are the most critical, while Buenavista is the least flood susceptible. In addition, the validation conducted with the use of GPS-based field survey and geotagging, indicates that the points validated conforms with the level of flood susceptibility according to the flood susceptibility map generated. Finally, the study recommends to set up necessary rain and water level gauge in flood plains to alert the community when it is time to evacuate, to spread awareness to the community, to have a proper land use plan, for the future researchers, conduct a further study about the flood susceptibility of Bayombong, and for agencies, use this study as a decision support in developing a flood risk management plan.

Keywords: Flood, Flood susceptibility map, AHP, GIS.

Research paper (Bachelor of Science in Geodetic Engineering)

Includes bibliographical references and appendices