The Application of AHP to Determine the Priority Drainage System on Flood Mitigation in Surabaya – Indonesia
Yang Ratri Savitri*1,*2, Ryuji Kakimoto*3,, Rawshan Ara Begum*4, Nadjadji Anwar*2, Wasis Wardoyo*2, and Erma Suryani*5
*1Graduate School of Science and Technology, Kumamoto University
2-39-1 Kurokami, Chuo-ku, Kumamoto, Kumamoto 860-8555, Japan
*2Department of Civil Engineering, Institut Teknologi Sepuluh Nopember, Jawa Timur, Indonesia
*3Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, Japan
*4Centre for Corporate Sustainability and Environmental Finance, Macquarie University, New South Wales, Australia
*5Department of Information System, Institut Teknologi Sepuluh Nopember, Jawa Timur, Indonesia
Natural disasters are common worldwide, especially in tropical countries. Floods are one such frequent disaster that occur in the tropical country of Indonesia. Floods cause disasters in many vulnerable societies living in the area. Therefore, it is necessary to conduct risk assessments for flood mitigation. The objective of this research is to support decision-making for flood risk assessment by selecting priority sub-systems. The research was conducted in Surabaya, East Java, and Indonesia. The Surabaya drainage system is divided into five districts consisting of several sub-systems facing inundation problems. This causes challenges for the government in selecting which sub-systems should be prioritized to overcome these problems. Consequently, a rank priority for sub-systems is required. This research validated whether the Analytics Hierarchy Process (AHP) method was applicable and appropriate to weight priority factors to select the priority drainage system. It weighs historical flood data by considering several criteria related to floods, consisting of flood hazards, social economics, and the environment. Flood hazard is defined as the severity level of flooding indicated by three indicators: inundation area, inundation depth, and inundation duration. Social-economics is a criterion covering population density and land use types consisting of residential areas, commercial and services areas, public facilities, industrial areas, port areas, and mix used development support areas. Environment is a criteria indicated by green open space, flood-prone areas, watershed catchment areas, and storage areas. The weighting result convinced the decision makers as to the related parameters which should be considered in order to support appropriate and effective flood mitigation. Further, due to budget constraints, the results of the research can be used to assist the municipal government in selecting which drainage system should be prioritized for management. The AHP result reveals that the priority drainage systems are Wonorejo sub system (Jambangan district), Greges sub system (Genteng district), Kedurus sub system (Wiyung district), Kalibokor sub system (Gubeng district), and Tambak Dono sub system (Tandes district). The result was confirmed to several respondents from Department of Public Works, Highways, and Drainage Management involved with the drainage system in Surabaya. It is indicates that the AHP results mostly are applicable to the existing condition.
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