Abstract
Most people in Tanah Bumbu Regency use water from dug wells for their daily activities. Kotabaru Regency is located in Pagatan Groundwater Basin, which is located in three administrative boundaries, namely Tanah Laut Regency, Tanah Bumbu Regency, The purposes of this study are to determine the type of groundwater facies and Water Quality Index (WQI). The methods were hydrogeological mapping and hydrogeochemical analysis of groundwater samples to evaluate groundwater quality. There were 170 groundwater samples mapped in the study area. The study area has differences in groundwater quality in both confined aquifer and unconfined aquifer. The unconfined aquifer has two types of groundwater facies, namely Ca-Mg-HCO3 (Calcium Magnesium Bicarbonate) and Ca-Cl (Calcium Chloride). In comparison, the confined aquifer has two types, which are Ca-Mg-HCO3- (Calcium Magnesium Bicarbonate) and Na-HCO3- (Sodium Bicarbonate). Based on the calculation of the Water Quality Index (WQI) of unconfined aquifer samples show that 70% of groundwater samples have poor quality. Meanwhile, the confined aquifer samples indicate that 85% of groundwater samples have good to excellent, which is suitable for drinking water.
Highlights
Tanah Bumbu Regency is part of the Pagatan Groundwater Basin which is a cross-regency groundwater basin covering Tanah Laut Regency, Tanah Bumbu Regency and Kotabaru Regency [1].The Pagatan groundwater basin in Tanah Bumbu Regency has an area of 5,067 km2 (506,714 ha) or 13.50% of the total area of South Kalimantan Province which consists of ten sub-districts (Figure 1a)
Water types of the confined aquifer are divided into two dominant groundwater facies, namely Ca-Mg-HCO3 (Calcium Magnesium Bicarbonate), and Na-HCO3 (Sodium Bicarbonate)
Facies of Ca-MgHCO3 indicate that water is associated with ions Ca2+ and Mg2+ from the carbonate minerals of the aquifer content in sandstone and limestone units as well as from clay minerals in alluvium deposits and claystones
Summary
The Pagatan groundwater basin in Tanah Bumbu Regency has an area of 5,067 km (506,714 ha) or 13.50% of the total area of South Kalimantan Province which consists of ten sub-districts (Figure 1a). It is necessary to conduct a study regarding the quality of groundwater both groundwater from the unconfined aquifer and confined aquifer to determine the groundwater facies and Water Quality Index (WQI) as the goals of this research.
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