URBAN FLOOD HAZARD MAP USING GIS OF MUANG SUKHOTHAI DISTRICT, THAILAND

Urban flood is one of the most challenge tasks for cities that needs the complex decision support system based on the integration among physical, social parameters and technical knowledge. It needs the analysis on flood hazard map to set up the emergency response plan. Most of communities in Thailand originated along the river of which urban flood is caused by both overflowing from river bank and ineffective drainage system. The most severe urban flood in Thailand occurs in Muang district of Sukhothai province. Because the city locates along Yom river basin where is no regulated dam upstream. Since there are the limitations on the technical support of local organizations. The aim of this paper, therefore, is to generate flood hazard map by coupling flood frequency analysis with GIS that the local officer can easily develop by themselves. Flood frequency analysis proves it can be an alternative method for flood hazard map generating. With the case study of Muang Sukhothai district, the accuracy of this method is 88.83%. The obtained flood hazard map will be the basic information for the decision maker not only on flood emergency response plan but also on prioritizing of budget allocation for flood protection system.