Abstract
Groundwater vulnerability to pollution refers to the ease with which pollutants reach groundwater, in other words indicating the level of ease of an area to experience pollution. At present, the theme is one of the themes that attracts many researchers because pollution is more frequent in an area. The purpose of this study is to assess groundwater vulnerability in the study area for pollution using the GOD method and conduct a study of 3 groundwater vulnerability assessments, to determine the most appropriate assessment to be applied in the study area. The method used to determine groundwater vulnerability to pollution is GOD, which uses three parameters to assess the vulnerability of groundwater, namely aquifer type, rock type above aquifer and groundwater level. Furthermore, the results of the vulnerability assessment using the GOD method are compared with the vulnerability assessment according to the SINTACS and DRASTIC methods that have been carried out before in this area. The results showed that the variation of groundwater vulnerability index values in the study area according to the GOD method was from 0.35 to 0.63. Locations that are classified as medium vulnerability are generally located in the limestone Sentolo Formation, while locations that are classified as high vulnerability class are located in the volcanic rock of Yogyakarta Formation. Noting the results of determining groundwater vulnerability from the three methods, it can be said that the three methods are suitable for assessing groundwater vulnerability in the study area. However, looking at the distribution pattern of the level of pollution, the DRASTIC method can provide more detailed results related to the level of vulnerability.
Highlights
Until now, groundwater is still the main source of water for humans to meet their needs for good quality water
Efforts to protect water catchment areas and increase water absorption can be done by determining land use, land use mechanism according to the ability and suitability of the land as well as the creation of urban forests, determination of green lanes and determination of buffer zones
The purpose of this study is to assess groundwater vulnerability in the study area for pollution using the GOD method and to study three groundwater vulnerability assessments (GOD, SINTACS and DRASTIC), to determine the most appropriate assessment to be applied in the study area
Summary
Groundwater is still the main source of water for humans to meet their needs for good quality water. Groundwater conservation efforts can be carried out through three activities namely protection of water catchment areas and increasing water absorption, monitoring groundwater extraction so as not to exceed limits, and controlling groundwater pollution. Efforts to protect water catchment areas and increase water absorption can be done by determining land use, land use mechanism according to the ability and suitability of the land as well as the creation of urban forests, determination of green lanes and determination of buffer zones. Efforts to conserve groundwater through monitoring groundwater extraction can be done by tightening the licensing process of making boreholes, installing water meters to record the amount of groundwater usage from boreholes, taxing groundwater use, there is an obligation for each borehole wells to make rainwater infiltration wells as deep as bore wells he made, restrictions on the use of groundwater only for domestic purposes and restrictions on the use of groundwater that does not exceed safe results
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