Hydrogeological conceptual model in the Batang Integrated Industrial Park, Central Java, Indonesia

¹ Master Program in Geological Engineering, Department of Geological Engineering, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
² Department of Geological Engineering, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
³ Ministry of Public Works and Housing, Republic of Indonesia, South Jakarta 12110, Indonesia
⁴ Center for Disaster Mitigation and Technological Innovation (GAMA-InaTEK), Universitas Gadjah Mada, Yogyakarta 55281, Indonesia

^* Corresponding author: fxganesasatriawidyatama@mail.ugm.ac.id

Abstract

The construction of Batang Integrated Industrial Park (BIIP) will surely affect the groundwater in this area and its surroundings. To estimate the impact of changes in land use and the potential use of industrial water from groundwater, a hydrogeological conceptual model has been constructed for the BIIP. The methodology involves gathering rainfall data to estimate potential recharge. The secondary and primary data of deep and shallow wells were used to evaluate the boundaries of groundwater flow directions and develop the geometry of the aquifer system. The boundary condition observation data, geophysics data, drilling log, and slug test results were collected and interpreted in a 2-dimensional as a conceptual model of the hydrogeological condition. The result reveals that groundwater flow boundaries are Java Sea in the North as a constant head boundary, Brontak River in the west, Pesanggrahan River in the east as a river boundary, and Srigunung hills in the south as a no-flow boundary. The aquifer system of the area is dominated by sand as an unconfined aquifer with a thickness maximum of 88 m and located up to 47 m below the surface. The recharge in the research area is approximately 950.5 mm/year. The hydraulic conductivity of the aquifers is 0.16 m/day to 0.401 m/day. This hydrogeological conceptual model provides essential information for numerical groundwater models.