Flood Risk Mapping in Katingan Regency Using Composite Mapping Analysis (CMA) Method

Flooding is the most common disaster in Katingan Regency. However, global warming worsens the flood risk, and making a flood risk map is the first step in generating a disaster management policy in Katingan Regency. This research uses spatial data to create flood risk modelling for the Katingan Regency. The Composite Mapping Analysis (CMA) method was applied to map the flood risk in Katingan Regency using four parameters: slope, soil type, precipitation and land-use type. The flood risk map shows that there are five classes of flood risk in Katingan Regency that are low risk (580.319,25 Ha or 29,12%), relatively low risk (760.974,50 Ha or 38,18%), medium risk (308.233,16 Ha or 15,47%), relatively high risk (293.040,65 Ha or 14,70%) and high risk (50.439,87 Ha or 2,53%). Medium to high risk of flooding in Katingan Regency is primarily distributed near the river with developed areas since this land use group is the most vulnerable to loss from flooding. Moreover, the Katingan Regency area, formed from an alluvial process characterized by a flat slope and clay-textured soil, has a higher chance of puddles.