Abstract: The regional hydrogeological conceptual model of Taipei Basin is established by means of 3D finitedifference groundwater flow model, that is MODFLOW, on bais of the numerous and widespread data of geological exploration and groundwater measurement. The regional groundwater flow during the large-scale pumping test of group wells for the deep excavations of Taipei MRT underground stations is simulated by means of conceptual model. The monitoring data of groundwater pressure after drawdown during the pumping test are recorded, so as to analyze and evaluate the nearfield hydraulic parameters of the deep confined aquifer in Taipei Basin. In the end, the effects of boundaries, recharges and vertical leakages on the simulations of groundwater flow are discussed.

Key words: group wells pumping test, conceptual model, Jinmei gravel strata, Taipei Basin, MODFLOW