本研究嘗試利用三維水文地質模式分析，考量不同場景組合(包括不同降雨補注條件、不同等級水文地質環境等)，進行三種情境之隧道出水量推估，推估案例隧道在不同情境(高出水潛勢、一般情形及低出水環境)可能之出水量，並與隧道開挖過程之實際開挖出水量進行比較，初步探討不同岩性時以水文地質模式推估隧道開挖出水量之關聯性及適用情形，希冀提供後續隧道開挖時之參考。

The Study of the tunnel inflow prediction was conducted in this paper using the three dimensional numerical model which was built by topography, geological structure and hydrological parameters to assess the groundwater seepage and the influence of groundwater level in tunnel excavation. Furthermore, the seepage data of each excavating step was applied to calibrate the hydraulic conductivity of rock mass along tunnel construction in order to modify the numerical model and revise hydrological model in this area. The combinations of different scenarios were taken into consideration for the estimation of possible groundwater loss in unexcavated area. Compared with the actual case and the result of Goodman’s method, the method is worth considering.