Pemetaan Ancaman Bencana Banjir Di Kota Pekalongan Menggunakan Analytical Hierarchy Process (AHP)

Abstract

Pekalongan City is an urban area that often experiences flooding. This flooding is caused because the topography of Pekalongan City is lower than the sea and there are several rivers, so it often causes flooding. Flood disasters have negative impacts in many ways. To reduce the negative impacts of flooding in the future, it is necessary to map flood threats as a reference for infrastructure development. This research aims to determine the results of weighting threat parameters and what parameters have the most influence in assessing the impact of flood disasters using the Analytical Hierarchy Process (AHP) as well as analyzing the mapping of flood-prone areas in Pekalongan City using the Analytical Hierarchy Process (AHP) method. The methods used in this research are the Hierarchy Process (AHP) and the Geographic Information System (GIS). The research results show that the most influential parameter in assessing the impact of flood disasters using the Analytical Hierarchy Process (AHP) is the rainfall parameter. Rainfall in the 2000–3000 mm/year class has a fairly large score in weighting, namely 1,304. Based on processing results, rainfall in the 2000–3000 mm/year class affects almost ¾ of the area of Pekalongan City, namely 4059.93 ha. The threat of flooding in Pekalongan City is divided into three threat classes: low, medium, and high. The flood area in the low class is 59.58923 ha, with a percentage of 1.29%. In the middle class, it covers an area of 663,7052 ha with a percentage of 14.367%, and in the high class, it covers an area of 3895,449 ha with a percentage of 84.340%. The distribution of flood threats per sub-district shows that most areas in each sub-district have a high flood threat. West Pekalongan District has 70.769% of its area in the high threat category, East Pekalongan 84.908%, North Pekalongan 94.103%, and South Pekalongan 82.755%. It is hoped that this research can help local governments adopt flood disaster management policies in Pekalongan City.