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THE PERMEABILITY OF THE FOUNDATION ROCK AT THE BOZTEPE (MALATYA/TURKEY) DAM SITE The Boztepe Dam has been constructed on the Yağca Stream, in about 10 km north of Yazıhan (Malatya) district. In this study, it was aimed to determine the permeability and effects of the discontinuities on the permeability of the rocks at the axis of the dam site. In this area it crop out different types of rock from Upper Jurassic to Quaternary. These units from the oldest to the youngest are; Upper Jurassic - Lower Cretaceous Hekimhan ophiolites, Paleocene Medik Formation, Lower Miocene Akyar formation, Middle - Upper Miocene Yamadağ volcanics, Pliocene Beylerderesi Formation, Quaternary terrace, slope debris and alluvium. The tuffite and basalt serve as foundation rocks at the dam site. According to the permeability tests at the dam site; tuffite is in classes of impermeable - slightly permeable rocks, basalt is in classes of slightly - high permeable rocks. The joints labeled as (1) and (4) and flow surfaces involved in the basalt at the dam site lead some problems in permeability. Since the tuffite is impermeable, there are not any effect of discontinuity surfaces on permeability. Key Words: Boztepe dam site, Discontinuity surface, Permeability.
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