Abstract
Land subsidence due to the seasonal fluctuation of ground water level in Saga Plain has been caused by pumping up in summer for agricultural purposes. The database of observation data obtained by ground subsidence observation well, leveling, pumpage investigation, meteorological observation and ground water quality investigation in several organizations was made in order to centralize the information on the ground subsidence in Saga Plain. A useful systematization of the database was established, as it could search the observation point information and express the distribution or the correlation of observation data.
