MAPPING THE GROUNDWATER POTENTIAL IN LUBUK BUAYA SUBDISTRICT, PADANG CITY USING THE WENNER CONFIGURATION GEOELECTRICAL METHOD

Nazma Aliya  Safitri; Akmam Akmam; Hamdi Hamdi; Nofi Yendri  Sudiar

doi:10.24036/zd8s1992

Authors

Nazma Aliya Safitri Department of Physics, Padang State University, Padang Author
Akmam Department of Physics, Padang State University, Padang Author
Hamdi Department of Physics, Padang State University, Padang Author
Nofi Yendri Sudiar Department of Physics, Padang State University, Padang Author

DOI:

https://doi.org/10.24036/zd8s1992

Keywords:

Geoelectricity, Groundwater, Wenner Configuration, Resistivity, Lubuk Buaya

Abstract

Population growth and urbanization in Lubuk Buaya Village, Padang City, have increased the demand for clean water, which has not yet been fully met. Most residents still rely on shallow dug wells with turbid and odorous water at depths of 2–3 meters. Water production in Padang City reaches 50,567,776 m³ per year, but only 32,732,482 m³ can be distributed by the Public Water Supply Company (PDAM), highlighting challenges in distribution and service coverage. This study employs a quantitative descriptive approach using field methods. Primary data was obtained through geophysical data acquisition using the ARES system with a Wenner configuration. The data was then interpreted using the Robust Constraint inversion method with the assistance of Res2dinv software. Data interpretation was supported by geological map information and observations of residents' dug wells to identify the types of rock formations and groundwater potential. Groundwater potential in Lubuk Buaya Village varies with resistivity values ranging from 0.18 to 44.1 Ωm, indicating three types of layers: sand and gravel (potentially brackish water), silt (groundwater potential), and alluvial (freshwater aquifer zone). Transects 2, 3, and 4 show groundwater potential, particularly in sand layers with moderate to high resistivity. Transect 2 has a free aquifer in alluvial sand (turbid water). Transect 3 is dominated by sandy silt at the top, with potential for a confined aquifer in alluvial layers at depths >2.5 meters. Traverse 4 has high-porosity alluvial sand (free aquifer, turbid water). Traverse 1 has low potential due to the dominance of silt and brackish water. Groundwater quality is still influenced by the physical properties of the constituent rocks.

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