Soil erodibility mapping for soil susceptibility in the upstream of Kelara Subwatershed in Jeneponto Regency

Abstract

Landslides and flash floods in Rumbia Village, Rumbia District, Jeneponto Regency on June 11-12, 2020, have caused material and non-material losses to the local population. The incident occurred very quickly with an area with a disaster impact on seven sub-districts and 18 villages. This study aims to map soil erodibility to assess soil susceptibility to landslides in the Upper Kelara Sub-watershed. Calculate soil erodibility using the Wischmeier and Smith method, texture with hydrometer method, c-organic with Walkley and Black, mapping of soil erodibility with the kriging approach, and expert judgment for soil susceptibility category. The results showed that c-organic value content (1.19 to 2.47%) has low in landslides areas, with soil permeability ranging from 0.23 to 1.16 cm/hour and soil texture dominated silty clay. Soil erodibility in the landslides area reaches a value of 0.4 with the high category of soil susceptibility. Soil erodibility is in line with soil susceptibility value, the high erodibility value, the high soil susceptibility category. Soil erodibility mapping showed a distribution of erodibility index increase in the bottom part of the Kelara Subwatershed. The Mitigation actions through government assistance and socialization of disaster-aware communities need to be carried out immediately so that incidents can be minimized and prevented in the future.