Field permeability tests in the boreholes were carried out. Water pressure tests (Lugeon Tests) using a single packer was performed in the borehole located at the dam site and reported in accordance with the Packer Test method According to the principle of A.C. Houlsby (1976), the tests were performed within rock strata in stages of 3 meters using the 5 pressure stage method (three ascending, two descending) in specified boreholes.