THE HYDROGEOLOGY OF OLIGOCENE AND QUARTENARY AQUIFERS OF CIPTAHARJA AREA, WEST BANDUNG DISTRICT, WEST JAVA Dasapta Erwin Irawan*, Rizky Agung Kurniawan, Nisrina Bahiyah Kesuma, Yuniarti Ulfa, Deny Juanda Puradimaja
Applied Geology Research Group, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
*dasaptaerwin3[at]gmail.com
Abstract
West Bandung Regency will be one of the hosts of the 2022 Pekan Olahraga Daerah, leading to the plan to build a new stadium in the Cipatat District. Following the plan, we conducted this research as a baseline hydrogeological study within an area of 25 km2. We find a set of Late Oligocene – Quaternary rocks showing deep sea to terrestrial deposits of Limestone, Sandstone, and Lahar. Several small folds and faults are also found in the area. All rocks serve as the aquifer in the area. The groundwater flows from south-southeast to northwest-west. We measured the physical parameters (temperature, TDS, EC, and pH) of more than 25 springs and dug wells, and 5 samples for major element tests in the laboratory. Referring to hydrochemistry using multivariable statistics, we classify the samples into two types: 1) shallow groundwater type is an immature groundwater with a close-range recharge area, short residence time, and low TDS/EC values, 2) shallow groundwater with a long-range recharge area, longer residence time, with a slightly higher TDS/EC values. We believe secondary permeability controls the flow of type two. However, the water should be drinkable after boiling.
Keywords: West Bandung, geology, hydrogeology, groundwater
