Delineation of Flood Hazard Zones by Using a Multi Criteria Evaluation Approach in Padang West Sumatera Indonesia

Abstract

In Indonesia flood disasters constitute natural disasters that often occur and have resulted in substantial losses to human life. Mitigation is the important measure to determine hazard flood zones. To determine the weight and rate, the Analysis Hierarchy Process (AHP), Geographical Information System (GIS) are used for overlay analysis. Upon assessment by experts, the research findings reveal that elevation is the highest weight, that is 24%; flood frequency is the lowest weight, that is 7,4%. Further, the analysis result on the flood hazard level in the research area, based on the hazard level class, reveals as follows: a) an area of 8,351.6 ha (12%) includes the high hazard zone; b) an area of 11,378.7 ha (16%) is the moderate hazard zone; and c) an area of 49,738.8 ha (72%) is the low hazard zone.

Key words: delineation, harzad flood area, mitigation.