Angelina Pinto Tontoiyo, Ferryati Masitoh, Fania An Nisaa, Kurniawan
Hydrogeological system information is very important as a basis for monitoring and managing sustainable groundwater resources. The main objective of this study is to develop a conceptual model of the hydrogeological system that provides information on: 1) subsurface conditions; 2) identification of aquifer types; 3) determination of shallow groundwater flow direction; 4) information on water input-output interaction in hydrogeological system; and 5) evaluation of water quality. The methods used include Electrical Resistivity Tomography (ERT) and drilling for subsurface condition analysis, spline interpolation for surface groundwater flow direction, water balance calculations, and water quality testing based on TDS and pH parameters. Analysis of subsurface data indicates the presence of two aquifer systems: unconfined aquifers and confined aquifers. The shallow groundwater flow was from southwest to northeast, following the topography of the area. Water balance calculations showed precipitation 2,625 mm/year, evapotranspiration of 1,960 mm/year, runoff 450 mm/year, and recharge of 214 mm/year. Water quality evaluation of 75 observation wells indicated that 24 wells failed to comply with the TDS standard for hygiene and sanitation (<300 mg/L), 8 wells were outside the acceptable pH range (6.5-8.5), and 4 wells did not satisfy both parameters. © Published under licence by IOP Publishing Ltd.
Department of Geography, Faculty of Social Sciences, State University of Malang, East Java, Malang City, Indonesia; PT. Agrinas Palma Nusantara (Persero) Survey and Investigation Division, Malang City, Indonesia
