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Conceptual Model of The Hydrogeological System for Water Sources in The Bali Cultural Center Area and Surroundings
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Conceptual Model of The Hydrogeological System for Water Sources in The Bali Cultural Center Area and Surroundings
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Journal Article
Conceptual Model of The Hydrogeological System for Water Sources in The Bali Cultural Center Area and Surroundings
2025
Overview
This research develops a conceptual hydrogeological model for the Bali Cultural Center and surrounding areas, integrating geological, hydrological, and meteorological data to improve understanding of groundwater flow and management. Field data collection and literature reviews were conducted to gather geological and hydrogeological information, while hydraulic conductivity was estimated through slug tests to determine permeability variations across formations. A ten-year meteorological dataset was analyzed to calculate the water balance, including rainfall, evapotranspiration, and surface runoff. The region’s geomorphology includes coastal plains, volcanic plains, fluvial valleys, and lava flow hills, which play a crucial role in groundwater movement. The geological structure consists of basaltic and laharic breccia as aquitards, while sand-boulder, gravel-sand, and beach-sand deposits serve as aquifers. Groundwater flows mainly from the northern hills to the southern coast, controlled by an internal hydrogeological boundary (HCB), with the southern boundary acting as a discharge zone. Hydraulic conductivity variations reflect differing permeability, influencing groundwater flow and storage. Water balance analysis reveals an average annual rainfall of 1,687 mm, with 30.4% recharging the groundwater, 39.3% lost to evapotranspiration, and 30.3% as surface runoff. This model highlights the need for sustainable groundwater management through effective monitoring, protection of recharge areas, and balanced extraction to ensure long-term water availability.
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