Abstract: The hydrogeological evaluation is an integrate part of the geotechnical investigations. Some commonly used hydrogeological related terminologies in the geotechnical investigations, such as, aquifer, water productivity, permeable layer, aquitard layer, are discussed in the paper. It is more reasonable to classify the groundwater that is trapped at the upper unsaturated layer as the perched water. Suggestions on the recommendation of hydrogeological parameters in the investigation as well as the aspects of the buoyancy design groundwater table are proposed. In order to accurately evaluate the site hydrogeological conditions, larger scale site evaluation work as well as experience are necessary.

Key words: Geotechnical Engineering Investigations, Hydrological Geology, Buoyancy Design Water Table