Abstract: The arrangements of deep foundations such as piles and caissons for the buildings with basements should consider the influence of the groundwater. When the high groundwater is encountered, mitigation methods should consider the site specific conditions and costs. When the hand dug caisson is selected and the installation is started after the completion of the deep excavation, to prevent the rapid raise of the groundwater, the number of the dewatering point wells, backup power sources can be utilized.

Key words: Deep Excavations, Discontinued Caissons, Failure Investigations, Mitigation Methods