The advanced workshop (June 29th to July 1st) provides details of an integrated surface-subsurface model of the Geum River Basin (GRB) based on a research paper entitled “Estimating Anthropogenic Effects on a Highly-Controlled Basin with an Integrated Surface-Subsurface Model” and its supply data (Hwang et al., 2021). Overall, participants will learn how to generate high-quality meshes, to build an integrated surface-subsurface model, and to operate HGS-PEST program for the model calibrations. Specifically, the topics of this workshop include: 1) overview of a basin-scale model and data structures, 2) detailed mesh generation, 3) 3D subsurface and 2D surface model constructions, 4) simulation parameter settings for cost-effective modelling, 5) detailed HGS-PEST operations based on the example model, 6) groundwater contribution analysis, and 7) model uncertainty analysis.