Abstract
The hydrogeological studies of Uwa basin in Ehime Prefecture performed in the period 1976-1978. The conclusion summarized as follows:
1) The geology of the Uwa basin consists of alternative beds of clay, sand and gravel that may correspond to the Quaternary system. The main aquifers are sand and gravel beds of the lower part of the Quaternary system.
2) The artesian wells are about 70 to 95 meters in depth and their amount of discharge is about 100-1500m3/day. It is suggested that the unit area discharge of groundwater for further development of this area is about 1000m3/day/km2.
3) The depth of the basement was presumed from the result of gravity survey. The maximum value in the depth is approximately 100 meters under the ground.
4) The water quality analyses indicate that the groundwater has a high concentration of dissolved iron compounds.
