The geohydraulic water pressure test or packer permeability test is a specialist in-situ field test used to investigate the hydraulic conductivity or coefficient of permeability (ki m/s) of the rock mass within discreet test sections, at specified depths in predrilled boreholes.
The hydraulic conductivity of a rock mass is mainly governed by the aperture, spacing and infilling characteristics of discrete discontinuities (including joints, bedding, fractures and foliations) and the fracture pattern (secondary permeability) rather than the effective porosity of the geological material itself (primary permeability).
The test is carried out as per British Standard BS EN ISO 22282- parts 1 and 3.
Packer-testing-service (PDF)