In the period 1973-1975, the hydrogeological studies were carried in the area of the Soraku hill, Kyoto Prefecturure. The conclusion are summarized as follows:
1) The geology of the Soraku hill consist of Sonoha formation and the lower part of the Osaka group. The main aquifers are sand bed and sand and gravel bed of the Osaka group.
2) The artesian wells are about 110 to 120 meters in depth and their discharge is about 700-800m³/day.
From the consideration of land subsidence in Osaka, it is suggested that the unit area discharge of ground water for further development of this area is about 1, 000m³/day/km² or 300, 000m³/year/km².
3) The depth of the basement was presumed from the result of gravity survey. The maximum value in the depth situated near Simoumedani is approximately 240 meters under the ground.
4) Though the quality of shallow wells is bad, that of deep wells is good.