Hydrogeological Conceptual Model in the Middle of Randublatung Groundwater Basin

Abstract

Randublatung groundwater basin is one of the groundwaters basins with massive utilization of groundwater pumping. However, the knowledge of the comprehensive hydrogeological system in this groundwater basin is limited, so this research aims to determine a comprehensive hydrogeological conceptual model of the Randublatung groundwater basin. The methodology was conducted by collecting secondary and primary data of deep and shallow wells to evaluate boundaries of pattern and direction of groundwater flow and develop the aquifer system’s geometry. The result shows that the groundwater flow boundaries are Grogol River in the west, Wado River in the East, Bengawan Solo river in the South as a river boundary, and Rembang Mountains in the North as a constant head boundary. Therefore, groundwater flows from the hills area to the Bengawan Solo River and the north as the river’s flow. Based on the log bor evaluation, the aquifer system of the study area consist of an unconfined aquifer with a maximum thickness of 20 m and three layers of confined aquifers with thickness vary between 8 to 60 m. the hydraulic conductivity of the aquifers depends on the aquifer’s lithology range from sand, gravel, limestone, and sandstone. This hydrogeological conceptual model provides essential information for numerical groundwater models in the middle of the Randublatung groundwater basin.

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

“…A hydrogeological conceptual model is a simple form of natural conditions with current knowledge about the groundwater system; it consists of a process and physical structures [8][9][10][11][12]. The hydrogeological conceptual model consists of identifying the internally and externally controlled model boundaries conditions such as heads and fluxes in a system, describing the hydro stratigraphy and geometry of aquifers, defining the aquifer characteristics, and defining the groundwater flow system [9][10][11][12].…”