CiliwungRiver water quality and its vicinity have been continuously degraded with the increasing population. The objective of this research is to understand the association between river and groundwater, and the water quality profile. Field measurements ware taken from 65 stations from Bogor to Jakarta. Water level, temperature, pH, and TDS were measured to build the water flow map and hydrochemical profile. Small-scale geoelectrical survey was conducted at five locations to capture the aquifer's geometry. We identified three types of stream relationships between river and groundwater: effluent from Bogor to Katulampa (Segment 1), perched at the University of Indonesia (UI) area (Segment 2), and influent from UI to Muara (Segment 3), with low gradient from \0.1 to 0.3. The temperature profile of river and groundwater shows similar pattern as well as TDS profile. All similarities support close connection of river and groundwater. The increasing TDS towards downstream shows increasing enrichment and contamination. The erratic pattern of pH indicates chemical instability due to high contamination. This study highlights the benefit of understanding the hydrodynamic relationship between river water and groundwater. Such interaction triggers water quality exchange between both water bodies. Therefore, a similar study should also be done on other riverbanks in Indonesia to protect water quality.
Grasberg Block Cave (GBC) underground mine, which is operated by PT Freeport Indonesia, located at High Land of Papua which has intensity of rainfall (average 4000 mm/year) and causing water inflow through the fractured rock, and flowing inside the underground mine. The water occurrence inside the underground mine could be in seepage form and water flow from diamond drilling hole. Water seepage inside underground mine contain many chemical compounds such as sulfate (SO4 2-). Sulfate has ability to cause acid water and sulfate attack, which can be a problem for ground support existing. Water from seepages of existing drift during development were collected and sent to laboratory to obtain detail chemical information. By correlating with geological data (formation and its content), distribution of water sulfate can be known. In the ore body of GBC, sulfate water content is higher than other lithologies. These data can be used for long term ground support planning in the future. Keywords
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