Underground Water Direction and Velocity Sounding at AN-8 Borehole

Hirata, Yoichi*; Matsumoto, Eiken*; Goto, Kazuyuki*

This paper describes the measurement result of underground water direction and velocity with Type LD-60 at AN-8 borehole. The investigation site including AN-8 is in Tsukiyoshi area Akiyo-chou, Mizunami city Gifu pref.The measurement rock bed is conglomerate that is classified Mizunami group, Akeyo Toki coal-bearing formation.The measurement result is as follows. (1) The underground water velocities are from 0.00012 to 0.0000032cm/s. (2) The underground water direction at GL-25.85m and GL-45.35m is east, and at GL-37.60m and GL-38.60m is west. (3) The rock beds that flows is toward east is thin, the thickness of these are from 20 to 50cm.The measurement sections that flow toward west are located in one rock bed which thickness is about 170cm, and these velocities are faster than others.