HYDROGEOLOGY STUDY IN CIPTAHARJA AREA AND SURROUNDING, BANDUNG BARAT DISTRICT, WEST JAVA

• Main Author: Agung Kurniawan, Rizky
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/46808
• Institution: Institut Teknologi Bandung

The appointment of West Bandung Regency as one of the hosts of the 2022 Regional Sports Week (Porda) led to the need for the construction of a new stadium in Cipatat District, West Bandung Regency. The construction of the stadium requires an Environmental Impact Analysis (AMDAL) to determine the feasibility and carrying capacity of the environment. Unfortunately, research in the area is relatively minimal so there is very little data available for initial environmental planning. Based on the KLHS report of West Bandung Regency in 2018, research on the carrying capacity of land and the distribution of water in West Bandung Regency is very rare so it acts the basis of this research. The research area is in Cipatat District, West Bandung Regency, West Java. Geographically, the study area is located at UTM coordinates 760000 - 765000 mT and 9240000 - 9245000 mU with an area of research area of 25 km2. The geomorphology of the study area is divided into six units; the Lahar Flow Plane Unit, the Alluvial Plane Unit, the Debris Avalance Hill Unit, the Lahar Flow Ridge Unit, the Cipeundeuy Fault Zone Ridge Unit, and the Rajamandala Fault Zone Ridge Unit. Stratigraphically, the study area is divided into three unofficial rock units formed in the Late Oligocene - Quaternary deposited in the deep sea - terrestrial environment. These successive rock units from older to younger are limestone units, sandstone units, and lahar deposits. The geological structure formed in the study area is in the form of folds and faults. The fold has the direction of the fold axis north northeast – south southwest and the fault consists of two; north-south oriented strike slip and reverse fault that has orientation north northeast – south southwest. The structure was formed before deposition of Lahar Deposit Unit. The research area consists of three hydrogeological units; Limestone Hydrogeological Unit, Sandstone Hydrogeological Unit, and Lahar Heposit Hydrogeological Unit. Gfied roundwater flow patterns generally head south-southeast to northwest-west. The measurement of physical parameters shows that 29 - 440 ppm of TDS, 137 - 661 ?Sm1- of EC, and 5.34 - 8.37 of pH. Groundwater genesis consists of shallow groundwater which classified as immature with recharge area near the research area / in the study area and old meteoric water which is mature freshwater.