The Impact of Flooding on Settlement Along the Jangkok River Mataram, Indonesia

Abstract

Abstract Floods are natural disasters that have harmed populations in several places in the world. Flooding in urban areas can be caused by coastal floods or river floods. One of the flood-prone areas in Lombok is the Jangkok River, the largest rivers that cross the city of Mataram. Floods have consequences that impact the social and economic activities. Direct impacts of flooding can include damage to property and infrastructure, especially in the settlement area. The purposes of this research are to analyze the flood-prone areas and to build a flood modeling of the Jangkok River. The data used for the analysis combined a topographic map scale 1:5.000, DEM LiDAR, land system, and rainfall data from the Tropical Rainfall Measuring Mission. The result shows that along the Jangkok River at a distance of 100 m estimated as the flood-prone areas. River flood modeling shows settlements have very high potential affected by floods caused by overflowing water from the Jangkok River. Modeling of flood inundation for the return period of 10 years, 50 years, and 100 years shows that the area of inundated settlements periodically expands the flooded area of 70.95 ha, 97.17 ha, and 108.41 ha. This study is expected to be an input to improve the preparation of disaster mitigation-based spatial planning in many coastal cities in Indonesia.