Hydrogeological Investigations of Shinjo Basin. Yamagata Prefecture
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概要
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The hydrogeological survey was carried out in Shinjo Basin in 1975 and the following results are obtained.<BR>1) The upper Neogene formations and Quarternary strata are developed in Shinjo Basin.<BR>2) The deluvium and alluvium are covered with the fan deposits which are 30 to 90 meters in thickness.<BR>3) The groundwater aquifers in this basin are divided into the I, II, III and IV horizon beds according to the electric ground resistivity method.<BR>4) The hydraulic conductivity is in the order of 10<SUP>-3</SUP>cm/sec as in Yonezawa Basin but at the surface layer (to 30 meters in depth) it is 10<SUP>-1</SUP>∼10<SUP>-2</SUP>cm/sec.<BR>5) The specific capacity of Shinjo Basin is relatively small compared with that of Yamagata or Yonezawa Basin.<BR>6) The ground water is reserved in the uppermost Miocene (Sakegawa Formation). It must be noticed that the unreasonable pumping up from the uppermost Miocene Formation will cause the land subsidence.
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