Geographia Technica, Vol 19, Issue 1, 2024, pp. 61-78
DETECTION OF FLOOD HAZARD POTENTIAL ZONES BY USING ANALYTICAL HIERARCHY PROCESS IN TUNTANG WATERSHED AREA, INDONESIA
Dewi Novita SARI 
, Alif Noor ANNA, Taryono TARYONO, Muchamad Farid MAULANA, Dinda Nur Fadila KHUMAEROH
ABSTRACT: Water resources play a crucial role in economic development, human health, and biodiversity. Mismanagement of water resources can lead to various disasters, with floods being one of the most frequent occurrences in river watershed. The rapid advancement of geospatial information systems enables the early prediction of flood hazard zones in the watershed by utilizing information about natural resources. This research focuses on determining flood hazard zones in the Tuntang Watershed through a combination of remote sensing, Geographic Information Systems (GIS), and the Analytic Hierarchy Process (AHP). Nine parameters are used to describe aquifer recharge zones, and each parameter is weighted according to its water characteristics and potential, determined through the AHP method based on expert opinions gathered in a Focus Group Discussion (FGD). The priority order obtained through AHP is as follows: precipitation, distance to the river, Land Use Land Cover (LULC), slope, Normalized Difference Vegetation Index (NDVI), elevation, curvature, Topographic Wetness Index (TWI), and soil type. The final flood hazard zone map is divided into five categories: very low, low, moderate, high, and very high. The results indicate that certain areas are very hazardous and present flood prone areas, namely Grobogan District with an area of 102.17 km2 (8.59 %), Demak with an area of 49.75 km2 (4.18%), and Semarang with an area of 45.23 km2 (3.80 %).
Keywords: Analytic Hierarchy Process, Multi-Criteria, Decision Making, Technical Geography, Geographic Information System
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