Journal article
Analisis Tingkat Kerawanan Banjir Di Kabupaten Sampang Menggunakan Metode Overlay Dengan Scoring Berbasis Sistem Informasi Geografis
Sampang is one of regency in Madura which always flood when rain. Beside the rainfall was too high, other factors likes slope and elevation of land, soil type and land use, and the last is density of river used as a parameter to study the vulnerability of flood.This research used overlay method with scoring between the existing parameters, each parameters is done by assigning weights scoring process and the value associated with each classification then be overlaid using ArcGIS software 10.2.1. This software use Geographic Information Systems (GIS) to explain and present the object of flood-prone areas in digital form.The results is a map of flood-prone areas that spread throughout the southern part with details of 359.266 km2 (29.3%) which very vulnerable category, 803.250 km2 (65.52%) was quite vulnerable, and 63.497 km2 (5.18%) was not vulnerable. Beside that, slope is the main factor causing flood. In addition to larger given weight, slope with 0-8% were spread in most part of southern region wich has extreme prone category to floods. This situation caused by region tend to be flat and low that it could potentially be a bin of water when it rains so that it can make flood.