The Lugeon test, sometimes call also Packer test, is an in-situ testing method widely used to estimate the avarage hydraulic conductivity of rock mass. The test is named after Maurice Lugeon (1933), a Swiss geologist who first formulated the test. Basically, the Lugeon test is a costant head permeability type test carried out in a isolated part of a borehole. The results provide information about hzdraulic condictivuty of the rock mass including the rock matrix and the discontinuities