RUKMANA, BANTAR TYAS SUKMAWATI (2019) ANALISIS PERBANDINGAN METODE GOD DAN DRASTIC PADA KERENTANAN AIR TANAH PT. ADARO INDONESIA. Masters thesis, Universitas Pembangunan Nasional Veteran Yogyakarta.
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Abstract
Coal mining is an activity that can cause changes in land use, morphology,
geology, and hydrogeology. These changes have an impact on topographic
changes, subsurface rock layers, and aquifers. Changes in land use affect the
potential for water catchment which will have an impact on the availability of
groundwater both in quantity and quality. One of the efforts in maintaining
groundwater potential and quality is by conducting groundwater vulnerability
analysis. The purpose of this study is to analyze groundwater vulnerability using
GOD and DRASTIC methods and to compare groundwater vulnerability of the
two methods. The benefits of this research are as a consideration for companies in
the management and protection of groundwater. This research was conducted at
the Pit Paringin of PT. Adaro Indonesia is located in Balangan Regency, South
Kalimantan Province. This study uses the GOD and DRASTIC methods in
analyzing groundwater vulnerability. The GOD method is influenced by three
parameters namely the type of aquifer, lithology above the aquifer, and the depth
to groundwater. The DRASTIC method is influenced by seven parameters namely
depth to groundwater, rainfall, aquifer media, soil media, topography, unsaturated
zone effects, and hydraulic conductivity. Based on the calculation of groundwater
vulnerability index using the GOD method produces two levels of vulnerability,
namely negligible (negligible or very low) and moderate (moderate). Groundwater
vulnerability zones are very low in the north, south and southeast of the Pit
Paringin, while medium ground water vulnerability zones are scattered in the
southwest and west to the east of the Pit Paringin. Based on the calculation of
groundwater vulnerability index using the DRASTIC method produces three
levels of vulnerability, namely very low, low, and moderate. Areas that have very
low groundwater vulnerability are located south of the Pit Paringin with a very
small area. Areas that have low groundwater vulnerability are spread evenly
throughout the Pit Paringin. Areas that have groundwater vulnerability are being
spread to the southwest, west, central, east, and northeast of the Pit Paringin with
a small area. The correlation coefficient between the DRASTIC index and the Fe
parameter is 75%, while the correlation coefficient between the GOD index and
the Fe parameter is 49.7%. The correlation coefficient between the DRASTIC
index and the Mn parameter is 75.6%, while the correlation coefficient between
the GOD index and the Mn parameter is 66.5%. The correlation coefficient
between the DRASTIC index and TSS parameters is 71.5%, while the correlation
coefficient between the GOD index and TSS parameters is 68.4%. The correlation
coefficient between the DRASTIC index and the pH parameter is 57.3%, while
the correlation coefficient between the GOD index and the pH parameter is
27.5%. The results of the analysis of the regression method between the
parameters of iron (Fe), manganese (Mn), suspended residue (TSS), and pH with
groundwater susceptibility index both methods show that the DRASTIC method is
more accurate than the GOD method.
Keywords: DRASTIC, GOD, Groundwater vulnerability
| Item Type: | Thesis (Masters) |
|---|---|
| Subjek: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Nurul Alifah Rahmawati |
| Date Deposited: | 12 Aug 2019 06:37 |
| Last Modified: | 12 Aug 2019 06:46 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/20711 |
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