Flood Vulnerability Mapping Using Geographic Information System (GIS) in Gajah Wong Sub Watershed, Yogyakarta County Province

  • A. Ardiansyah Geography Education Master Program, Yogyakarta State University, Jl. Colombo No.1, Karang Malang, Yogyakarta, 55281, Indonesia
  • Dyah Respati Suryo Sumunar Department of Geography Education, Yogyakarta State University, Jl. Colombo No.1, Karang Malang, Yogyakarta, 55281, Indonesia

Abstract

Gajah Wong Sub Watersheds frequently hit by floods which are potentially damaging. Therefore, a study on a flood vulnerability of the area is deemed necessary. This study aims to map floods vulnerability, to know the level and its spread in Gajah Wong Sub Watershed of Yogyakarta County Province by using Geographic Information System (GIS). The methods implemented in this study was weighting and scoring analysis and overlay of parameter attributes data of flood vulnerability framer, consisting of land use, slope of mountain, rainfall, soil type, geology, height of location and river buffer. Each parameter of flood vulnerability framer is classified based on the magnitude of effect towards flood vulnerability. The results of this study indicate that there were three levels of flood vulnerability in  Gajah Wong Sub Watershed, i.e. low flood vulnerability of 338.34 Ha (6.86%), medium flood vulnerability level of 4,595.62 Ha (93.13%) and high flood vulnerability level of  0.76 Ha (0.02%). Low flood vulnerability level is ditributed randomly to all areas of  Gajah Wong Sub Watershed cover of Ngaglik Sub-district, Depok Sub-district, small part of  Pleret Sub-district and was predominantly in  Banguntapan Sub-district, an area with rainfall. Medium flood vulnerability areas dominated Gajah Wong Watershed. Meanwhile, high flood vulnerability level occupied small portion of the area and spread in the southern part of Pleret Sub-district which was taken as the area of River Buffer analysis.


Keywords: GIS; Gajah Wong; Sub Watershed; Yogyakarta.


 


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Published
2020-04-10
How to Cite
ARDIANSYAH, A.; SUMUNAR, Dyah Respati Suryo. Flood Vulnerability Mapping Using Geographic Information System (GIS) in Gajah Wong Sub Watershed, Yogyakarta County Province. Geosfera Indonesia, [S.l.], v. 5, n. 1, p. 47-64, apr. 2020. ISSN 2614-8528. Available at: <https://jurnal.unej.ac.id/index.php/GEOSI/article/view/9959>. Date accessed: 27 dec. 2024. doi: https://doi.org/10.19184/geosi.v5i1.9959.
Section
Original Research Articles