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Assessing groundwater quality by using hydrogeochemical analysis to achieve sustainable development in the peri urban area Kotabaru Regency/South Borneo Indonesia
Thomas Triadi Putranto and Rahmad Syafrizal Ginting

Geologican Engineering Department, Faculty of Engineering, Diponegoro University


Abstract

Pagatan Groundwater Basin (CAT) is located in three regencies, namely Tanah Laut Regency, Tanah Bumbu Regency, and Kotabaru Regency in the Province of South Borneo. The research area is in Tanah Bumbu Regency. Most people in Tanah Bumbu Regency use water from dug wells for their daily needs. The purposes of this study are to determine the type of groundwater facies and Water Quality Index (WQI). The methods approach were hydrogeological mapping and analysis of hydrogeochemical samples of groundwater from both confined aquifer and unconfined aquifer. There were 170 groundwater samples are mapped in the study area. In addition, observations of geological conditions and land use as well as hydrogeochemical analysis and groundwater facies were carried out to determine the effect of environmental conditions on groundwater quality. The study area consists of serpentinite, claystone, limestone, sandstone, and alluvium deposits. The geomorphology is divided into 4 landform units namely Marin landform, Denudational landform, Karst landform and Structural landform. The study area has differences in groundwater quality in both confined aquifer and unconfined aquifers. The unconfined aquifer has two types of groundwater facies, namely Ca-Mg-HCO3 (Calcium Magnesium Bicarbonate) and Ca-Cl (Calcium Chloride). While the confined aquifer has two types which are Ca-Mg-HCO3- (Calcium Magnesium Bicarbonate) and Na-HCO3- (Sodium Bicarbonate). Based on calculation of the Water Quality Index (WQI) of unconfined aquifer shows 70% of groundwater samples have poor quality. Meanwhile, the unconfined aquifer indicates 85% of groundwater samples have good quality which is suitable for consumption.

Keywords: Groundwater, Facies, Hydrogeochemical, Water Quality Index, Tanah Bumbu

Topic: Peri Urban Development

Link: https://ifory.id/abstract/NTXzdpnV9BEJ

Conference: The 4th International Conference on Regional Development (ICRD 2019)

Plain Format | Corresponding Author (Thomas Triadi Putranto)

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