Spatial analysis of flood-prone areas and harvest failures in the Wanggu Southeast Sulawesi Watershed

Abstract

Increased land-use change and geomorphological conditions such as rainfall factors, the level of slope, altitude of the place, soil texture, natural drainage density, and influence of infrastructure development affected to DAS hydrological response and caused of increased flood insecurity in the region. The study aims to analyze the factors of causes of flood insecurity and its impacts in the cities of Kendari and DAS Wanggu and to know the level and distribution of flooding in the area of DAS Wanggu by utilizing Geographic Information system (GIS) as well as knowing the loss of rice paddy and scattered rice. This research uses methods of surveying and scoring, weighted, and overlay on some parameters of the flood cause. The results showed that DAS Wanggu has a high rainfall of 200-360 mm per month and is categorized as a wetland, land use does not fit the class with a flat slope of 40.1%, soil texture medium to rough 82.3%, altitude place 26 m – 50 m 29.0%, medium drainage density is 89.3%, soil hydrological properties are inadequate. There are four classes of flood vulnerability dominated by the prone class-very prone to 17,857.12 ha (56.2%) 1) and the rest of the class safe 8,799.60 ha (27.7%) and somewhat prone to 5083.65 ha (16.0%). Loss of Stutty harvest due to flooding on rice paddy fields, corn, peanuts, and red chili with a total area of 6,499.4 ha amounting to Rp 105,508,937,000.