GEOLOGICAL AND HYDROGEOLOGICAL STUDY IN CIKALONG WETAN, WEST BANDUNG REGENCY

• Main Author: Saffani Adam, Alfian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69700
• Institution: Institut Teknologi Bandung

The research area is located in Cikalong Wetan. The area of research area is 26.3 km2. The research area has the potential to have pollution problems caused by the Cikalong Cattle Farm and the potential of groundwater level decline by the highspeed rail project. This study aims to determine the geological setting and hydrogeological conditions. The method used in this research is geological observation and analysis, observation and analysis of hydrogeological conditions. The geomorphology of the research area is divided into three geomorphological units based on the Cileuleuy Lava Ridge Unit, the Pasir Angsana Hills Unit, and the Cisaukeun Denudasional Valley Unit. The stratigraphy of the study area consists of four unofficial units of Middle Miocene – Late Pleistocene age, namely the Sandstone Unit, Claystone Unit, Andesite Lava Unit, and Tuf Unit. The geological structures that developed in the research area are the Cigeblig Right Slip Fault, the Cisaukeun Normal Right Slip Fault, and the Rende Normal Left Slip Fault. The typology of the aquifer consists of the typology of volcanic deposits and the typology of the folded sedimentary aquifer system. The types of springs found in the study area are fracture and depression types. The hydrodynamic relationship between water flow in aquifers and rivers is the dominant effluent. The hydrogeology of the research area is divided into three independent aquifer units, namely Sandstone Aquifer, Claystone Aquifer, Andesite Aquifer, and Tuf Aquifer. Based on the pH parameter, groundwater that does not comply the drinking water quality standards is generally located in the western part of the study area, close to the Cirata Lake. The groundwater quality of the study area is suitable for irrigation purposes based on the analysis of Na%, Sodium Adsorption Ratio (SAR), Residual Sodium Carbonate (RSC), Wilcox diagram, and United States Salinity (USSL) diagram. Regarding the existence of a tunnel project in the research area, the condition of the groundwater level around the tunnel area has decreased. Meanwhile, regarding the existence of cattle farming, the condition of the quality of groundwater and river water around the location is still within the drinking water quality standard.