Prediction of the Extent of Flood Indicators Used from the Slope Map in the River Flow Area in the City of Samarinda, East Kalimantan, Indonesia

Flood disasters in Indonesia and Samarinda City in general are disasters that continue to occur every year. Information on the dangers and risks of flooding is really needed, including the type of flood, the possibility of a flood occurring, the extent of flood inundation, the depth and speed of the flood, and the level of damage (to life, property and economic activity). The aim of the research is to determine the extent of inundation and the potential for flooding in areas in the river basin in terms of slope maps. This research was carried out in the Karang Asam Kecil River Basin, Samarinda City, East Kalimantan Province, Indonesia. Research activities include: literature study, collection of primary and secondary data, data processing and analysis. The results of the research show that: (1) The area of ​​inundation, namely in Air Hitam Subdistrict, is 77 hectares (2.85%), Air Putih Subdistrict is 81 hectares (3.00%), Bukit Pinang Subdistrict and Sidodasi Subdistrict are 1 hectare each. (0.04%), Teluk Lerong Ilir Village covering an area of ​​14 hectares (0.52%), and in Teluk Lerong Ulu Village covering an area of ​​7 hectares (0.26%); and (2) flood-prone areas in the Karang Asam Kecil sub-watershed occur in the Samarinda Ulu sub-district with an inundation area of ​​174 hectares and in the Sungai Kunjang sub-district an inundation area of ​​7 hectares.