When construction of underground facilities were planned at the sites where the ground is composed of soft sediments with high water level, groundwater management plans should be made to keep the excavation construction site safe and dry, and to avoid harmful settlement around the construction site. In such case, efficient and quick design tools are needed to estimate the construction influence and counter-measure effect on groundwater level and on settlement of the field. We developed a simple settlement evaluation system utilizing the data set of MODFLOW groundwater flow simulation. The settlement estimation is executed quickly and easily using commercial software “MS Excel”. The system is applied to a road tunnel construction site. The outline of the system and the results applied to an actual tunnel construction site are presented.
