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Opening pores There are few reliable methods for determining insitu permeability of soils and rocks. Max Soudain looks at a new borehole logging system which detects tiny pressure-dependent electrical

Marlborough-based Ground- Flow launched its electrokinetic logging tool (EKL) at the beginning of this year after extensive testing throughout 1997. The technique is based on the company's surface operated electrokinetic survey (EKS) method in which a small sonde, just 70mm in diameter and 720mm long, measures permeability of the ground by sending sonic pulses into the material and measuring the electrical echoes that result from the pressure wave.

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