ANALYSIS OF PUMPING TEST AND GROUNDWATER QUALITY IN MANGGIS DISTRICT, KARANGASEM REGENCY, BALI PROVINCE

• Main Author: Ridho, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/75080
• Institution: Institut Teknologi Bandung

The research area is administratively located in Manggis District, Karangasem Regency, Bali Province which covers an area of 9.74 km2 . Bali has a significant number of domestic and international tourists as well as increasing population growth, leading to high groundwater needs. In addition, Bali is facing long-term problems, i.e., groundwater contamination and groundwater table depletion. Aquifer parameters are needed to quantify groundwater table depletion, whereas groundwater quality needs to be analysed to estimate the potential and level of groundwater contamination. This study is carried out to estimate the aquifer’s transmissivity and understand groundwater quality based on the TDS and pH. Based on the literature study, the study area is within Volcanic Plain Geomorphological Unit and stratigraphically located in Oligocene - Lower Miocene Ulakan Formation. This formation covers Denpasar-Tabanan Groundwater Basin and act as an aquifer with alternating tuff, sandstone, and limestone. Aquifer type of the study area is unconfined aquifer. The aquifer parameter is analysed using data from two wells, whereas groundwater quality is assessed based on data from 12 wells. The two wells penetrate an unconfined aquifer of the Ulakan Formation. The transmissivities are 6,823 ? 10!" and 6,816 ? 10!" m2 /s. The TDS ranges from 314 to 6,430 mg/L, whereas the pH ranges from 6 to 8.28. TDS and pH of several wells do not meet the standard for drinking water by the Minister of Health of the Republic of Indonesia (Permenkes RI No. 32 / 2017).