Geological study of the ground water containing manganese (Mn) in Yokohama City, Japan

Kikkawa, Y.; Tanaka, R.; Arai, K.; Isoda, S.; Sugimoto, M.

Proceedings of the Symposium on Geo-Environments 12: 111-116


Accession: 019037015

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There are 6000 or more drilled-wells in Yokohama City. The well water is generally used for industry. It is also considered as drinking water that will be provided in the case of disaster. However in some of well water the manganese content has been more than a standard established in the Water Supply Low. To understand the relationship between the manganese distribution and geologic strata in Yokohama city, we examined the well water taken from 271 drilled-wells and compared with the Topographic and geologic map. In the north area of Yokohama city, the well water containing manganese more than the standard was observed at 12 points. They were drawn from the strata of Kazusa formation. In the west area, they containing NO (sub 3) -N but not manganese were low pH. They were also drawn from the strata of Sagami formation. In the coastal area, although well water was drawn from the strata of Kazusa formation, there was no point that the manganese content is more than the standard. This study would be useful for understanding the spread of pollution through the ground water.