The level of safety of groundwater to pollution hazards can be identified based on the level of vulnerability of the groundwater to pollution. Determination of groundwater vulnerability intrinsically can be done by using the Aquifer Vulnerability Index (AVI) method based on two physical parameters i.e. the thickness of each layer above the uppermost of saturated aquifer surface and the estimated hydraulic conductivity of each of these sedimentary layers. The objective of this study was to determine the level of groundwater vulnerability intrinsically based on the vulnerability index value of aquifers by using the AVI method. This study was conducted based on sample of 25 dug wells scattered in the Jombang District of Jombang Regency, East Java, Indonesia. Based on the results of the analysis using the AVI method, it can be stated that the hydraulic resistance logarithm in the study area were found to be in the range from -5.22 to 3.84 with the intrinsic vulnerability of groundwater to pollution hazards from extremely high to low.
Sources of pollutants in the Cileungsi-Cikeas-Bekasi River Basin were inventoried, through data from the district’s Environmental Agency where the three rivers cross. Pollutant sources were also determined based on searches in the form of type, number, and location, using google maps and google earth. The search results are mapped by applying ArcGIS. The aim of the research was to determine land-based source of pollution entering the river. The types and sources of pollutants vary greatly in terms of type, location, and number. In the three river basins, it is known that there were 413 industrial sectors, 538 restaurants, 457 housing complexes, 80 hospitals, 92 hotels, 53 shopping centers, 37 livestock, 147 small and medium sized entities (SMEs), and 59 domestic. The source of pollutants entering the Cikeas River was dominated by housing complexes. The source of pollutants entering the Cileungsi River was dominated by industry. Meanwhile, the sources of pollutants entering Bekasi River were mostly shopping centers, hotels, hospitals, and restaurants.
Most of the population in the Jombang District area uses groundwater from dug wells and bor wells to meet their daily water needs. The quality of water from these wells was not always well controlled. The purpose of this research was to assess the quality of groundwater for drinking water and map its distribution patterns in the research location. The type of this research was development research with a descriptive research design. The groundwater quality index value for drinking water was determined based on the water quality index model and then mapped its distribution spatially in the study area. The spatial distribution of groundwater quality for drinking water in the study area, both during the rainy season and the dry season was dominated by areas with good and very good groundwater quality. The spatial distribution model of groundwater quality can be used as an indicator to assess the appropriateness of groundwater quality for drinking water in the research location.
Most of the population in the Jombang District area uses groundwater from dug wells and bor wells to meet their daily water needs. The quality of water from these wells was not always well controlled. The purpose of this research was to assess the quality of groundwater for drinking water and map its distribution patterns in the research location. The type of this research was development research with a descriptive research design. The groundwater quality index value for drinking water was determined based on the water quality index model and then mapped its distribution spatially in the study area. The spatial distribution of groundwater quality for drinking water in the study area, both during the rainy season and the dry season was dominated by areas with good and very good groundwater quality. The spatial distribution model of groundwater quality can be used as an indicator to assess the appropriateness of groundwater quality for drinking water in the research location.
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