| Abstrak/Abstract |
Groundwater is a valuable water source for the community in the Cangkringan Sub-district to fulfill their daily needs. Interactions between groundwater, aquifer minerals, and anthropogenic activities significantly influence groundwater chemistry. This research aims to determine the hydrochemical characteristics of groundwater, groundwater quality, and hydraulic connectivity of aquifer systems. The research stages began with general hydrogeological observations, geology, collection of 17 groundwater samples, and laboratory analysis. The results show that the major ion content of groundwater follows the order Na > Ca > K > Mg and HCO3 > SO4 > Cl > NO3. The groundwater can be divided into four main facies, namely alkaline bicarbonate, alkaline chloride, calcium magnesium bicarbonate, and calcium magnesium chloride. Groundwater quality in the study area is in the safe category according to drinking water
standards. The source of groundwater pollutants in this area was identified as coming from agricultural waste and fertilizers based on the Cl (mmol/L) and NO3/Cl (molar ratio) comparison chart. The hydrogeological conceptual model addresses changes in groundwater chemistry as water flows beneath the surface, with groundwater chemistry evolving in upstream and downstream zones. The longer the water flows underground, the farther the flow is differentiated for changes in groundwater chemistry in the study area, as evidenced by changes in groundwater facies. |
