Flood Prediction for the Wampu River Basin Using the Simple Additive Weighting Method:A Case Study of  the Wampu River in Bahorok

Miftahul Janna; Said Iskandar; Arnita; Zulfahmi Indra; Susiana

doi:10.59934/jaiea.v5i3.2268

Authors

Miftahul Janna Universitas Negeri Medan
Said Iskandar Universitas Negeri Medan
Arnita Universitas Negeri Medan
Zulfahmi Indra Universitas Negeri Medan
Susiana Universitas Negeri Medan

DOI:

https://doi.org/10.59934/jaiea.v5i3.2268

Keywords:

Flood Risk; Decision Support System; Simple Additive Weighting; Bahorok District

Abstract

Flood is one of the natural disasters that frequently occurs in the Wampu Watershed (DAS Wampu), especially in Bahorok District. Flood risk is influenced by several factors such as rainfall, slope gradient, land use changes, and river depth. The problem in this study is the absence of a decision support system that can objectively determine flood risk levels. This study aims to determine the criteria and weights of flood risk, apply the Simple Additive Weighting (SAW) method, and analyze the accuracy level of the SAW method in determining flood risk. The method used in this research is the Simple Additive Weighting (SAW) method through several stages including criteria weighting, decision matrix construction, data normalization, preference value calculation, and alternative ranking. The research data consists of 18 villages with four criteria: rainfall, slope gradient, land use change, and river depth. The results show the classification of flood risk levels into high, medium, and low categories based on the obtained preference values. Villages with the highest preference values indicate a higher level of flood vulnerability compared to other villages. The model evaluation results indicate that the SAW method has an accuracy level of approximately 90% in determining flood risk classification. Based on these results, it can be concluded that the SAW method can be used as a decision support system to determine flood risk levels and provide recommendations for priority flood mitigation areas in Bahorok District.

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