1. ASTM D2434, Standard Test Method for Permeability of Granular Soils (Constant Head), 2006.
2. Time lag and soil permeability in ground water observations;Hvorslev,1951
3. Code of Practice for Site Investigations;BS 5930,1999
4. ASTM D6391, Standard Test Method for Field Measurement of Hydraulic Conductivity Using Borehole Infiltration, 2011.
5. A generalized variable-head borehole permeameter analysis for saturated, unsaturated, rigid or deformable porous media;Reynolds;Eng. Geol.,2015