Flood hazard mapping using QGIS Spatial Analysis in Bangko and Masjid Watershed at Riau, Indonesia

Abstract

Floods are natural events that are dangerous to humans and property and cause environmental and economic losses. Riau Province is currently one of the richest provinces in Indonesia, and its resources are dominated by natural resources, especially oil and natural gas. This study was conducted to assess the extent to which flood-prone areas in the Bangko and Masjid watersheds in Riau Province. This study aims to obtain a flood Hazard map based on slope, land cover, elevation, rainfall, buffer zone, and soil type with GIS Software, which is also needed to determine Riau Province pipeline networks. Based on mapping results, in the Bangko watershed, 61% of the total area is vulnerable to flooding, and 20% has high to very high vulnerability, while in the Masjid watershed, 84% of the area is vulnerable to flooding, and 11% of the total area having high to very high vulnerability. This is due to the low watershed elevation, flat slope, high rainfall, and residential areas close to the river in the watershed. Therefore, it is very important to create an easy-to-understand and easy-to-understand flood hazard map that emphasizes the mitigating effects of management.